$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

$colb Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-K Financial Statement

#000088734316000045 Filed on February 29, 2016

Income Statement

Concept	2015 Q4	2015 Q3	2015 Q2
Revenue	$82.77M	$82.67M	$82.04M
YoY Change	3.59%	7.17%	7.82%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development		$3.796M	$4.242M
YoY Change		-11.08%	15.27%
% of Gross Profit
Depreciation & Amortization	$8.400M	$7.300M	$6.900M
YoY Change	-62.67%	48.98%	-14.81%
% of Gross Profit
Operating Expenses		$3.796M	$4.242M
YoY Change		-11.08%	15.27%
Operating Profit
YoY Change
Interest Expense	$950.0K	$971.0K	$1.030M
YoY Change	-16.15%	6.35%	6.96%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$37.34M	$37.30M	$31.80M
YoY Change	32.94%	19.58%	6.46%
Income Tax	$10.60M	$11.52M	$9.853M
% Of Pretax Income	28.38%	30.88%	30.99%
Net Earnings	$26.74M	$25.78M	$21.95M
YoY Change	41.33%	19.45%	3.39%
Net Earnings / Revenue	32.31%	31.19%	26.75%
Basic Earnings Per Share	$0.46	$0.45	$0.38
Diluted Earnings Per Share	$0.46	$0.45	$0.38
COMMON SHARES
Basic Shares Outstanding	57.73M shares	57.05M shares	57.06M shares
Diluted Shares Outstanding		57.06M shares	57.07M shares

Balance Sheet

Concept	2015 Q4	2015 Q3	2015 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$175.3M	$172.2M	$177.7M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$164.2M	$168.5M	$170.4M
YoY Change	-4.56%	10.63%	8.77%
Goodwill	$382.8M	$382.8M	$382.5M
YoY Change	0.06%	11.28%	11.22%
Intangibles	$23.58M	$25.23M	$26.92M
YoY Change	-22.59%	18.25%	18.13%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$8.952B	$8.756B	$8.518B
YoY Change	4.35%	17.28%	16.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$100.0M	$73.00M	$92.00M
YoY Change	-11.5%	192.0%	268.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$100.0M	$73.00M	$92.00M
YoY Change	-11.5%	192.0%	268.0%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$103.0M	$107.0M	$100.0M
YoY Change	7.29%	13.83%	17.65%
Total Long-Term Liabilities	$103.0M	$107.0M	$100.0M
YoY Change	7.29%	13.83%	17.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$100.0M	$73.00M	$92.00M
Total Long-Term Liabilities	$103.0M	$107.0M	$100.0M
Total Liabilities	$7.710B	$7.502B	$7.282B
YoY Change	4.88%	17.77%	17.35%
SHAREHOLDERS EQUITY
Retained Earnings	$255.9M	$250.0M	$243.9M
YoY Change	9.14%	7.96%	8.51%
Common Stock	$990.3M	$989.1M	$987.3M
YoY Change	0.45%	14.62%	14.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.242B	$1.254B	$1.236B
YoY Change
Total Liabilities & Shareholders Equity	$8.952B	$8.756B	$8.518B
YoY Change	4.35%	17.28%	16.73%

Cashflow Statement

Concept	2015 Q4	2015 Q3	2015 Q2
OPERATING ACTIVITIES
Net Income	$26.74M	$25.78M	$21.95M
YoY Change	41.33%	19.45%	3.39%
Depreciation, Depletion And Amortization	$8.400M	$7.300M	$6.900M
YoY Change	-62.67%	48.98%	-14.81%
Cash From Operating Activities	$33.90M	$36.30M	$37.60M
YoY Change	-32.74%	52.52%	34.77%
INVESTING ACTIVITIES
Capital Expenditures	-$200.0K	-$2.600M	-$800.0K
YoY Change	-90.0%	23.81%	-77.14%
Acquisitions
YoY Change
Other Investing Activities	-$222.3M	-$232.6M	-$62.00M
YoY Change	-18.54%	59.42%	-9.75%
Cash From Investing Activities	-$222.6M	-$235.1M	-$62.70M
YoY Change	-19.03%	58.85%	-13.16%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	191.7M	193.4M	-45.80M
YoY Change	28.49%	18.5%	-243.57%
NET CHANGE
Cash From Operating Activities	33.90M	36.30M	37.60M
Cash From Investing Activities	-222.6M	-235.1M	-62.70M
Cash From Financing Activities	191.7M	193.4M	-45.80M
Net Change In Cash	3.000M	-5.400M	-70.90M
YoY Change	-103.98%	-113.85%	471.77%
FREE CASH FLOW
Cash From Operating Activities	$33.90M	$36.30M	$37.60M
Capital Expenditures	-$200.0K	-$2.600M	-$800.0K
Free Cash Flow	$34.10M	$38.90M	$38.40M
YoY Change	-34.92%	50.19%	22.29%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013	colb	Allowance For Loan And Lease Losses Net Changes In Unfunded Commitments And Letters Of Credit Allowance AllowanceForLoanAndLeaseLossesNetChangesInUnfundedCommitmentsAndLettersOfCreditAllowance	590000	USD
CY2014	colb	Allowance For Loan And Lease Losses Net Changes In Unfunded Commitments And Letters Of Credit Allowance AllowanceForLoanAndLeaseLossesNetChangesInUnfundedCommitmentsAndLettersOfCreditAllowance	150000	USD
CY2015	colb	Allowance For Loan And Lease Losses Net Changes In Unfunded Commitments And Letters Of Credit Allowance AllowanceForLoanAndLeaseLossesNetChangesInUnfundedCommitmentsAndLettersOfCreditAllowance	275000	USD
CY2012Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	1915000	USD
CY2013Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	2505000	USD
CY2014Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	2655000	USD
CY2015Q4	colb	Allowance For Unfunded Loan Commitments And Letters Of Credit AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit	2930000	USD
CY2014Q4	colb	Amount Of Estimated Clawback Liability AmountOfEstimatedClawbackLiability	4200000	USD
CY2015Q4	colb	Amount Of Estimated Clawback Liability AmountOfEstimatedClawbackLiability	5154000	USD
CY2014Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Lossinstant AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossinstant	11989000	USD
CY2015Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Lossinstant AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossinstant	9021000	USD
CY2014Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Lossinstant AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLossinstant	14339000	USD
CY2015Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Lossinstant AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLossinstant	18268000	USD
CY2014Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position Lessthan12 Months Aggregate Loss Instant AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLossInstant	2350000	USD
CY2015Q4	colb	Availableforsale Securities Continuous Unrealized Loss Position Lessthan12 Months Aggregate Loss Instant AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLossInstant	9247000	USD
CY2013	colb	Basic Earnings Allocated To Common Shareholders BasicEarningsAllocatedToCommonShareholders	59398000	USD
CY2014	colb	Basic Earnings Allocated To Common Shareholders BasicEarningsAllocatedToCommonShareholders	80637000	USD
CY2015	colb	Basic Earnings Allocated To Common Shareholders BasicEarningsAllocatedToCommonShareholders	97577000	USD
CY2014Q4	colb	Brokered Money Market Accounts BrokeredMoneyMarketAccounts	83402000	USD
CY2015Q4	colb	Brokered Money Market Accounts BrokeredMoneyMarketAccounts	100854000	USD
CY2014Q4	colb	Certificates Of Deposit Insured By Cdars CertificatesOfDepositInsuredByCdars	18429000	USD
CY2015Q4	colb	Certificates Of Deposit Insured By Cdars CertificatesOfDepositInsuredByCdars	26901000	USD
CY2013	colb	Change In Federal Deposit Insurance Corporation Loss Sharing Asset ChangeInFederalDepositInsuranceCorporationLossSharingAsset	-45017000	USD
CY2014	colb	Change In Federal Deposit Insurance Corporation Loss Sharing Asset ChangeInFederalDepositInsuranceCorporationLossSharingAsset	-19989000	USD
CY2015	colb	Change In Federal Deposit Insurance Corporation Loss Sharing Asset ChangeInFederalDepositInsuranceCorporationLossSharingAsset	-4010000	USD
CY2015Q4	colb	Common Equity Tier1 Capital CommonEquityTier1Capital	852731000	USD
CY2015Q4	colb	Common Equity Tier1 Capitalto Risk Weighted Assets CommonEquityTier1CapitaltoRiskWeightedAssets	0.1194
CY2015Q4	colb	Common Equity Tier1 Risk Based Capital Requiredfor Capital Adequacyto Risk Weighted Assets CommonEquityTier1RiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets	0.045
CY2015Q4	colb	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacy CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacy	321370000	USD
CY2014Q4	colb	Core And Other Deposits CoreAndOtherDeposits	6923789000	USD
CY2015Q4	colb	Core And Other Deposits CoreAndOtherDeposits	7438594000	USD
CY2014Q4	colb	Core Deposits CoreDeposits	6619944000	USD
CY2015Q4	colb	Core Deposits CoreDeposits	7127866000	USD
CY2014Q4	colb	Deferred Tax Asset Other Real Estate Owned Costs DeferredTaxAssetOtherRealEstateOwnedCosts	1101000	USD
CY2015Q4	colb	Deferred Tax Asset Other Real Estate Owned Costs DeferredTaxAssetOtherRealEstateOwnedCosts	813000	USD
CY2014Q4	colb	Deferred Tax Liabilities Asset Purchase Tax Basis Difference DeferredTaxLiabilitiesAssetPurchaseTaxBasisDifference	6595000	USD
CY2015Q4	colb	Deferred Tax Liabilities Asset Purchase Tax Basis Difference DeferredTaxLiabilitiesAssetPurchaseTaxBasisDifference	9058000	USD
CY2014Q4	colb	Deferred Tax Liabilities Stock Dividends DeferredTaxLiabilitiesStockDividends	4086000	USD
CY2015Q4	colb	Deferred Tax Liabilities Stock Dividends DeferredTaxLiabilitiesStockDividends	1232000	USD
CY2014Q4	colb	Deferredtaxassetspurchaseaccounting Deferredtaxassetspurchaseaccounting	15272000	USD
CY2015Q4	colb	Deferredtaxassetspurchaseaccounting Deferredtaxassetspurchaseaccounting	9457000	USD
CY2014Q4	colb	Deferredtaxliabilitiesunrealizedgainsonavailableforsalesecurities Deferredtaxliabilitiesunrealizedgainsonavailableforsalesecurities	2987000	USD
CY2015Q4	colb	Deferredtaxliabilitiesunrealizedgainsonavailableforsalesecurities Deferredtaxliabilitiesunrealizedgainsonavailableforsalesecurities	0	USD
CY2014Q3	colb	Deposit Premium Percentage DepositPremiumPercentage	0.0235
CY2014Q4	colb	Deposits Valuation Adjustment From Acquisition Accounting DepositsValuationAdjustmentFromAcquisitionAccounting	933000	USD
CY2015Q4	colb	Deposits Valuation Adjustment From Acquisition Accounting DepositsValuationAdjustmentFromAcquisitionAccounting	235000	USD
CY2015	colb	Discount On Common Stock Under Employee Stock Purchase Plan Percent DiscountOnCommonStockUnderEmployeeStockPurchasePlanPercent	0.1
CY2013	colb	Disposal Group Not Discontinued Operation Cashpaidindisposalofassets DisposalGroupNotDiscontinuedOperationCashpaidindisposalofassets	0	USD
CY2014	colb	Disposal Group Not Discontinued Operation Cashpaidindisposalofassets DisposalGroupNotDiscontinuedOperationCashpaidindisposalofassets	16788000	USD
CY2015	colb	Disposal Group Not Discontinued Operation Cashpaidindisposalofassets DisposalGroupNotDiscontinuedOperationCashpaidindisposalofassets	0	USD
CY2013	colb	Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares	523000	USD
CY2014	colb	Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares	780000	USD
CY2015	colb	Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares Earningsallocatedtoparticipatingsecuritiesnonvestedrestrictedshares	1075000	USD
CY2013	colb	Earningsallocatedtoparticipatingsecuritiespreferredshares Earningsallocatedtoparticipatingsecuritiespreferredshares	95000	USD
CY2014	colb	Earningsallocatedtoparticipatingsecuritiespreferredshares Earningsallocatedtoparticipatingsecuritiespreferredshares	157000	USD
CY2015	colb	Earningsallocatedtoparticipatingsecuritiespreferredshares Earningsallocatedtoparticipatingsecuritiespreferredshares	175000	USD
CY2013	colb	Effective Income Tax Rate Reconciliation Life Insurance Proceeds EffectiveIncomeTaxRateReconciliationLifeInsuranceProceeds	-0.01
CY2014	colb	Effective Income Tax Rate Reconciliation Life Insurance Proceeds EffectiveIncomeTaxRateReconciliationLifeInsuranceProceeds	-0.01
CY2015	colb	Effective Income Tax Rate Reconciliation Life Insurance Proceeds EffectiveIncomeTaxRateReconciliationLifeInsuranceProceeds	-0.01
CY2013	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount	1362000	USD
CY2014	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount	448000	USD
CY2015	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationamount	0	USD
CY2013	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent	0.02
CY2014	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent	0.00
CY2015	colb	Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent Effectiveincometaxratereconciliationnondeductibleexpensebusinesscombinationpercent	0.00
CY2015Q4	colb	Exitordisposalactivitytotalexpectedcost Exitordisposalactivitytotalexpectedcost	2100000	USD
CY2015Q4	colb	Exitordisposalcostamountincurredincurrentperiod Exitordisposalcostamountincurredincurrentperiod	514000	USD
CY2015Q4	colb	Exitordisposalcostsremainingamounttobeincurredinfutureperiods Exitordisposalcostsremainingamounttobeincurredinfutureperiods	1600000	USD
CY2014	colb	Fdic Loss Sharing Asset Write Downs Of Other Real Estate FdicLossSharingAssetWriteDownsOfOtherRealEstate	1065000	USD
CY2015	colb	Fdic Loss Sharing Asset Write Downs Of Other Real Estate FdicLossSharingAssetWriteDownsOfOtherRealEstate	1158000	USD
CY2014Q4	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets FederalDepositInsuranceCorporationLossSharingIndemnifiedAssets	13100000	USD
CY2015Q4	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets FederalDepositInsuranceCorporationLossSharingIndemnifiedAssets	6000000	USD
CY2014Q4	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets Receivable FederalDepositInsuranceCorporationLossSharingIndemnifiedAssetsReceivable	2100000	USD
CY2015Q4	colb	Federal Deposit Insurance Corporation Loss Sharing Indemnified Assets Receivable FederalDepositInsuranceCorporationLossSharingIndemnifiedAssetsReceivable	605000	USD
CY2015Q4	colb	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate After Ten Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterTenYearsFromBalanceSheetDate	0.0537
CY2015Q4	colb	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToFiveYearsFromBalanceSheetDate	0.0566
CY2015Q4	colb	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Fixed Rate After Ten Years FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateAfterTenYears	5000000	USD
CY2015Q4	colb	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Fixed Rate Before Valuation Adjustment FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateBeforeValuationAdjustment	68000000	USD
CY2015Q4	colb	Federal Home Loan Bank Fixed Rate Advances Valuation Adjustment From Acquisition Accounting FederalHomeLoanBankFixedRateAdvancesValuationAdjustmentFromAcquisitionAccounting	531000	USD
CY2014Q4	colb	Federal Reserve Bank Advances Collateral Pledged FederalReserveBankAdvancesCollateralPledged	86130000	USD
CY2015Q4	colb	Federal Reserve Bank Advances Collateral Pledged FederalReserveBankAdvancesCollateralPledged	85428000	USD
CY2014Q4	colb	Federal Reserve Bank Advances Maximum Amount Available FederalReserveBankAdvancesMaximumAmountAvailable	86130000	USD
CY2015Q4	colb	Federal Reserve Bank Advances Maximum Amount Available FederalReserveBankAdvancesMaximumAmountAvailable	85428000	USD
CY2015Q4	colb	Federaloperatinglosscarryforwardssettobegintoexpirein2024 Federaloperatinglosscarryforwardssettobegintoexpirein2024	23600000	USD
CY2015Q4	colb	Federaltaxcreditcarryforwardssettoexpirein2015 Federaltaxcreditcarryforwardssettoexpirein2015	569000	USD
CY2013Q4	colb	Financing Receivable Modifications Additional Commitment To Lend FinancingReceivableModificationsAdditionalCommitmentToLend	0	USD
CY2014Q4	colb	Financing Receivable Modifications Additional Commitment To Lend FinancingReceivableModificationsAdditionalCommitmentToLend	0	USD
CY2015Q4	colb	Financing Receivable Modifications Additional Commitment To Lend FinancingReceivableModificationsAdditionalCommitmentToLend	0	USD
CY2014Q4	colb	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing Number Of Loans FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruingNumberOfLoans	1400000
CY2014Q4	colb	Financing Receivable Recorded Investment Gross Nonaccrual Status FinancingReceivableRecordedInvestmentGrossNonaccrualStatus	31352000	USD
CY2014Q4	colb	Financing Receivable Unpaid Principal Balance Nonaccrual Status FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus	44774000	USD
CY2015Q4	colb	Financing Receivable Unpaid Principal Balance Nonaccrual Status FinancingReceivableUnpaidPrincipalBalanceNonaccrualStatus	32263000	USD
CY2013Q4	colb	Goodwill And Intangible Assets Total GoodwillAndIntangibleAssetsTotal	369804000	USD
CY2014Q4	colb	Goodwill And Intangible Assets Total GoodwillAndIntangibleAssetsTotal	412996000	USD
CY2015Q4	colb	Goodwill And Intangible Assets Total GoodwillAndIntangibleAssetsTotal	406339000	USD
CY2015Q4	colb	Idahostateoperatinglosscarryforwardssettobegintoexpirein2024 Idahostateoperatinglosscarryforwardssettobegintoexpirein2024	32700000	USD
CY2013	colb	Income Tax Reconciliation Life Insurance Proceeds IncomeTaxReconciliationLifeInsuranceProceeds	1250000	USD
CY2014	colb	Income Tax Reconciliation Life Insurance Proceeds IncomeTaxReconciliationLifeInsuranceProceeds	1352000	USD
CY2015	colb	Income Tax Reconciliation Life Insurance Proceeds IncomeTaxReconciliationLifeInsuranceProceeds	1554000	USD
CY2013Q4	colb	Loan And Lease Losses General Allocation LoanAndLeaseLossesGeneralAllocation	70764000	USD
CY2014Q4	colb	Loan And Lease Losses General Allocation LoanAndLeaseLossesGeneralAllocation	69328000	USD
CY2015Q4	colb	Loan And Lease Losses General Allocation LoanAndLeaseLossesGeneralAllocation	67519000	USD
CY2013Q4	colb	Loan And Lease Losses Specific Reserve LoanAndLeaseLossesSpecificReserve	1690000	USD
CY2014Q4	colb	Loan And Lease Losses Specific Reserve LoanAndLeaseLossesSpecificReserve	241000	USD
CY2015Q4	colb	Loan And Lease Losses Specific Reserve LoanAndLeaseLossesSpecificReserve	653000	USD
CY2015Q4	colb	Loans And Leases Receivable Loans Evaluated For Impairment On Quarterly Basis Outstanding LoansAndLeasesReceivableLoansEvaluatedForImpairmentOnQuarterlyBasisOutstanding	500000	USD
CY2015Q4	colb	Loans And Leases Receivable Nonaccrual Loans Considered Impaired LoansAndLeasesReceivableNonaccrualLoansConsideredImpaired	500000	USD
CY2014Q4	colb	Loans And Leases Receivable Nonaccrual Of Interest Commitments Of Additional Funds LoansAndLeasesReceivableNonaccrualOfInterestCommitmentsOfAdditionalFunds	349000	USD
CY2015Q4	colb	Loans And Leases Receivable Nonaccrual Of Interest Commitments Of Additional Funds LoansAndLeasesReceivableNonaccrualOfInterestCommitmentsOfAdditionalFunds	2900000	USD
CY2015	colb	Look Back Period Under Employee Stock Purchase Plan LookBackPeriodUnderEmployeeStockPurchasePlan	P6M
CY2013	colb	Merchant Processing MerchantProcessing	3551000	USD
CY2014	colb	Merchant Processing MerchantProcessing	4006000	USD
CY2015	colb	Merchant Processing MerchantProcessing	4204000	USD
CY2013	colb	Netcostbenefitofoperationofotherrealestateowned Netcostbenefitofoperationofotherrealestateowned	-7401000	USD
CY2014	colb	Netcostbenefitofoperationofotherrealestateowned Netcostbenefitofoperationofotherrealestateowned	-1045000	USD
CY2015	colb	Netcostbenefitofoperationofotherrealestateowned Netcostbenefitofoperationofotherrealestateowned	-1629000	USD
CY2013	colb	Netgainonsaleandvaluationadjustmentsof Oreo NetgainonsaleandvaluationadjustmentsofOREO	8504000	USD
CY2014	colb	Netgainonsaleandvaluationadjustmentsof Oreo NetgainonsaleandvaluationadjustmentsofOREO	1870000	USD
CY2015	colb	Netgainonsaleandvaluationadjustmentsof Oreo NetgainonsaleandvaluationadjustmentsofOREO	2152000	USD
CY2015Q4	colb	Non Single Family Covered Assets NonSingleFamilyCoveredAssets	110819000	USD
CY2015Q4	colb	Number Of Branch Locations NumberOfBranchLocations	149
CY2015	colb	Number Of Days Of Delinqunecy At Which Loans Are Categorized As Non Accrual Status NumberOfDaysOfDelinqunecyAtWhichLoansAreCategorizedAsNonAccrualStatus	P90D
CY2015	colb	Number Of Days Used To Determine Treatment As Cash Equivalent NumberOfDaysUsedToDetermineTreatmentAsCashEquivalent	P90D
CY2015Q4	colb	Number Of Issuances Of Securities Exceeding Shareholders Equity Threshold NumberOfIssuancesOfSecuritiesExceedingShareholdersEquityThreshold	0
CY2015	colb	Number Of Look Back Period Under Employee Stock Purchase Plan NumberOfLookBackPeriodUnderEmployeeStockPurchasePlan	2	period
CY2015Q4	colb	Oregonstateoperatinglosscarryforwardssettobegintoexpirein2024 Oregonstateoperatinglosscarryforwardssettobegintoexpirein2024	540000	USD
CY2014	colb	Other Real Estate Ownedestablishedthroughacquisition OtherRealEstateOwnedestablishedthroughacquisition	2752000	USD
CY2015	colb	Other Real Estate Ownedestablishedthroughacquisition OtherRealEstateOwnedestablishedthroughacquisition	0	USD
CY2015	colb	Payment Of Clawback If Losses Less Than Stated Levels Period After Acquisition PaymentOfClawbackIfLossesLessThanStatedLevelsPeriodAfterAcquisition	P10Y45D
CY2013	colb	Paymentto Fdic Relatedto Loss Sharing Asset PaymenttoFDICRelatedtoLossSharingAsset	0	USD
CY2014	colb	Paymentto Fdic Relatedto Loss Sharing Asset PaymenttoFDICRelatedtoLossSharingAsset	3451000	USD
CY2015	colb	Paymentto Fdic Relatedto Loss Sharing Asset PaymenttoFDICRelatedtoLossSharingAsset	1865000	USD
CY2015Q4	colb	Preferred Stock Converted Into Common Stock Shares PreferredStockConvertedIntoCommonStockShares	102363	shares
CY2013	colb	Prepayment Charge On Federal Home Loan Bank Advances PrepaymentChargeOnFederalHomeLoanBankAdvances	1548000	USD
CY2014	colb	Prepayment Charge On Federal Home Loan Bank Advances PrepaymentChargeOnFederalHomeLoanBankAdvances	0	USD
CY2015	colb	Prepayment Charge On Federal Home Loan Bank Advances PrepaymentChargeOnFederalHomeLoanBankAdvances	0	USD
CY2013	colb	Proceeds From Sales Of Loans Held For Investment And Other Assets ProceedsFromSalesOfLoansHeldForInvestmentAndOtherAssets	2917000	USD
CY2014	colb	Proceeds From Sales Of Loans Held For Investment And Other Assets ProceedsFromSalesOfLoansHeldForInvestmentAndOtherAssets	2840000	USD
CY2015	colb	Proceeds From Sales Of Loans Held For Investment And Other Assets ProceedsFromSalesOfLoansHeldForInvestmentAndOtherAssets	15074000	USD
CY2013	colb	Proceedsfrom Fdi Cforreimbursementonlosssharingasset ProceedsfromFDICforreimbursementonlosssharingasset	9246000	USD
CY2014	colb	Proceedsfrom Fdi Cforreimbursementonlosssharingasset ProceedsfromFDICforreimbursementonlosssharingasset	5950000	USD
CY2015	colb	Proceedsfrom Fdi Cforreimbursementonlosssharingasset ProceedsfromFDICforreimbursementonlosssharingasset	4659000	USD
CY2014	colb	Real Estate Acquired Through Foreclosure Transfers In Net Of Write Downs RealEstateAcquiredThroughForeclosureTransfersInNetOfWriteDowns	10200000	USD
CY2015	colb	Real Estate Acquired Through Foreclosure Transfers In Net Of Write Downs RealEstateAcquiredThroughForeclosureTransfersInNetOfWriteDowns	8688000	USD
CY2014	colb	Repaymentsofsubordinateddebt Intermountain Statutory Trust RepaymentsofsubordinateddebtIntermountainStatutoryTrust	8300000	USD
CY2014Q4	colb	Repurchaseagreementsamountsoffsetinbalancesheet Repurchaseagreementsamountsoffsetinbalancesheet	0	USD
CY2015Q4	colb	Repurchaseagreementsamountsoffsetinbalancesheet Repurchaseagreementsamountsoffsetinbalancesheet	0	USD
CY2014Q4	colb	Repurchaseagreementsnetamountpresentedinstatementoffinancialposition Repurchaseagreementsnetamountpresentedinstatementoffinancialposition	105080000	USD
CY2015Q4	colb	Repurchaseagreementsnetamountpresentedinstatementoffinancialposition Repurchaseagreementsnetamountpresentedinstatementoffinancialposition	99699000	USD
CY2014Q4	colb	Securitiessoldunderagreementstorepurchaseamountnotoffset Securitiessoldunderagreementstorepurchaseamountnotoffset	0	USD
CY2015Q4	colb	Securitiessoldunderagreementstorepurchaseamountnotoffset Securitiessoldunderagreementstorepurchaseamountnotoffset	0	USD
CY2015Q4	colb	Shares Available For Purchase Under Employee Stock Purchase Plan SharesAvailableForPurchaseUnderEmployeeStockPurchasePlan	499610	shares
CY2015Q4	colb	Single Family Covered Assets SingleFamilyCoveredAssets	39022000	USD
CY2015Q1	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.14
CY2015Q2	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.16
CY2015Q3	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.16
CY2015Q4	colb	Special Dividends Payable Amount Per Share SpecialDividendsPayableAmountPerShare	0.18
CY2015Q4	colb	Statetaxcreditcarryforwardssettoexpirein2015 Statetaxcreditcarryforwardssettoexpirein2015	1500000	USD
CY2013	colb	Stock Adjustment Value Deferred Compensation StockAdjustmentValueDeferredCompensation	517000	USD
CY2014	colb	Stock Adjustment Value Deferred Compensation StockAdjustmentValueDeferredCompensation	-1000	USD
CY2013	colb	Taxes Licenses And Fees TaxesLicensesAndFees	5033000	USD
CY2014	colb	Taxes Licenses And Fees TaxesLicensesAndFees	4552000	USD
CY2015	colb	Taxes Licenses And Fees TaxesLicensesAndFees	5395000	USD
CY2014	colb	Transfer Other Real Estate Write Down TransferOtherRealEstateWriteDown	4039000	USD
CY2015	colb	Transfer Other Real Estate Write Down TransferOtherRealEstateWriteDown	1986000	USD
CY2015	dei	Amendment Flag AmendmentFlag	false
CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0000887343
CY2016Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	57744431	shares
CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015Q2	dei	Entity Public Float EntityPublicFloat	1856086644	USD
CY2015	dei	Entity Registrant Name EntityRegistrantName	COLUMBIA BANKING SYSTEM INC
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	49435000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	57162000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	20149000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12044000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	5621000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6295000	USD
CY2014	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	205000	USD
CY2013	us-gaap	Advertising Expense AdvertisingExpense	4090000	USD
CY2014	us-gaap	Advertising Expense AdvertisingExpense	3964000	USD
CY2015	us-gaap	Advertising Expense AdvertisingExpense	4713000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2800000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2900000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4100000	USD
CY2013	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	14196000	USD
CY2014	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	15110000	USD
CY2015	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	15079000	USD
CY2013	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	23941000	USD
CY2014	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	24722000	USD
CY2015	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	25067000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6045000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6293000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6882000	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	64000	shares
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	64000	shares
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	37000	shares
CY2014Q4	us-gaap	Assets Assets	8578846000	USD
CY2015Q4	us-gaap	Assets Assets	8951697000	USD
CY2015Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	2157610000	USD
CY2014Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	2098257000	USD
CY2015Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	2157694000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	25527000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	18352000	USD
CY2014Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	14339000	USD
CY2015Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	18268000	USD
CY2014Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	2087069000	USD
CY2015Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	2157610000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	999082000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1217129000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	437414000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	918813000	USD
CY2014Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	561668000	USD
CY2015Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	298316000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	702234000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	703088000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	458889000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	458372000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	969012000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	968699000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	22191000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	22418000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	5284000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	5117000	USD
CY2015Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	2157694000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	462000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	552000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gain Loss Net AvailableForSaleSecuritiesGrossRealizedGainLossNet	1581000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	16423000	USD
CY2014Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	16541000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	632000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	553000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1591000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	166900000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	63300000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	95400000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	170000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1000	USD
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	10000	USD
CY2014Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	526643000	USD
CY2015Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	533399000	USD
CY2013	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3570000	USD
CY2014	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3823000	USD
CY2015	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4441000	USD
CY2014Q4	us-gaap	Capital Capital	890029000	USD
CY2015Q4	us-gaap	Capital Capital	924284000	USD
CY2014Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	503989000	USD
CY2015Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	571324000	USD
CY2014Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080
CY2015Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080
CY2014Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1413
CY2015Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1294
CY2013	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	-154170000	USD
CY2014	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	32255000	USD
CY2015	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	513926000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	179561000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	188170000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	175302000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-334365000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	8609000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-12868000	USD
CY2014Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	171221000	USD
CY2015Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	166929000	USD
CY2012Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	166888000	USD
CY2013Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	103907000	USD
CY2014Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	73849000	USD
CY2015Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	58981000	USD
CY2013	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	51816000	USD
CY2014	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	36066000	USD
CY2015	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	21919000	USD
CY2013	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	6898000	USD
CY2014	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	3386000	USD
CY2015	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	1681000	USD
CY2013	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	-4267000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	68000	USD
CY2014Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2015Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	63033000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	115000000	shares
CY2014	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	9394000	USD
CY2015	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	8732000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.41
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.94
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.34
CY2015Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.16
CY2015Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2015Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2015Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	57437000	shares
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	57724000	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	57437000	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	57724000	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	985839000	USD
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	990281000	USD
CY2013	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	14076000	USD
CY2014	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	15369000	USD
CY2015	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	17421000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	27823000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	99239000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	86911000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21581000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21565000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	36426000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5413000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14646000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6367000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	68457000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	64119000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	44704000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	44897000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	14929000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11467000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	532000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	180000	USD
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CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1177000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1423000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	69000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	26341000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	26024000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	3916000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	23753000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	19222000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	25544000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	4691000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	5202000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5394000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3730000	USD
CY2015Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Domestic Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfDomesticSubsidiaries	0	USD
CY2014	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	0	USD
CY2015	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	4874000	USD
CY2014	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	1718000	USD
CY2015	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	979000	USD
CY2014	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	511000	USD
CY2015	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	0	USD
CY2014	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1325000	USD
CY2015	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2491000	USD
CY2014	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2015	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	2617000	USD
CY2014Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	1300000	USD
CY2015Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	1800000	USD
CY2014Q4	us-gaap	Deposits Deposits	6924722000	USD
CY2015Q4	us-gaap	Deposits Deposits	7438829000	USD
CY2014Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	1760331000	USD
CY2015Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	1788552000	USD
CY2014Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	615721000	USD
CY2015Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	657016000	USD
CY2013	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	40431000	USD
CY2014	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	44459000	USD
CY2015	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	30312000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10200000	USD
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10900000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	12300000	USD
CY2014Q3	us-gaap	Disposal Date1 DisposalDate1	2014-08-23
CY2013	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2014	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	565000	USD
CY2015	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19858000	USD
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	49494000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	77263000	USD
CY2013	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	32000	USD
CY2014	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	96000	USD
CY2015	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	137000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.53
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.21
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.05
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.52
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.71
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.31
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.31
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.30
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.00
CY2014	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.02
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.05
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	-0.05
CY2015Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9600000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y3M29D
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1203000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	205000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2014Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	15174000	USD
CY2015Q4	us-gaap	Fdic Indemnification Asset FDICIndemnificationAsset	6568000	USD
CY2013	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4706000	USD
CY2014	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4549000	USD
CY2015	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4806000	USD
CY2013	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	51030000	USD
CY2014	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	44876000	USD
CY2015	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Balance Of Agreements Outstanding FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding	70678000	USD
CY2013Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0109
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0041
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0079
CY2013	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0112
CY2014	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0074
CY2015	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate For Year FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear	0.0068
CY2013Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	190631000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	216568000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Maximum Outstanding At Any Month End FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd	242556000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1083879000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1399201000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Maximum Amount Available FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable	865138000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Maximum Amount Available FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable	1328971000	USD
CY2013Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	36606000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	216568000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	68531000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0034
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Fixed Rate FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate	68531000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Fixed Rate One To Five Years FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateOneToFiveYears	1000000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Fixed Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRateUnderOneYear	62000000	USD
CY2014Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	33365000	USD
CY2015Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	12722000	USD
CY2013	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	48351000	USD
CY2014	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	55555000	USD
CY2015	us-gaap	Fees And Commissions Depositor Accounts FeesAndCommissionsDepositorAccounts	61881000	USD
CY2013	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	8812000	USD
CY2014	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	7975000	USD
CY2015	us-gaap	Fees And Commissions Other FeesAndCommissionsOther	8975000	USD
CY2013	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2014	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2015	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2015Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	USD
CY2015Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	21464000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	30459000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23577000	USD
CY2013	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2014	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-51000	USD
CY2015	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	11000	USD
CY2013	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	48000	USD
CY2014	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-564000	USD
CY2015	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-573000	USD
CY2013	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	462000	USD
CY2014	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	552000	USD
CY2015	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	1581000	USD
CY2014	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	5909000	USD
CY2015	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	4138000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	115554000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	343952000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	382537000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	382762000	USD
CY2013	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	228398000	USD
CY2014	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	38585000	USD
CY2015	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	225000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	87010000	USD
CY2014Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	28640000	USD
CY2014Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29870000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	31188000	USD
CY2014Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	28087000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	117785000	USD
CY2015Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	35188000	USD
CY2015Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	31799000	USD
CY2015Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	37295000	USD
CY2015Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	37338000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	141620000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26994000	USD
CY2014Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8796000	USD
CY2014Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8643000	USD
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9605000	USD
CY2014Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9167000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36211000	USD
CY2015Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10827000	USD
CY2015Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9853000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11515000	USD
CY2015Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10598000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	42793000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	30454000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	41225000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	49567000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	541000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1218000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1541000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	4113000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	5328000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	6761000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	26754000	USD
CY2014	us-gaap	Income Taxes Paid IncomeTaxesPaid	21230000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	30522000	USD
CY2013	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	33983000	USD
CY2014	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	250629000	USD
CY2015	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	514107000	USD
CY2013	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	0	USD
CY2014	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	21037000	USD
CY2015	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-5381000	USD
CY2013	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	7938000	USD
CY2014	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	944000	USD
CY2015	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	75000	USD
CY2013	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-122000	USD
CY2014	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	89000	USD
CY2015	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-142000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3385000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4479000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5419000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-10336000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-5119000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1242000	USD
CY2013Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	919000	USD
CY2014Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	919000	USD
CY2015Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	919000	USD
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	25852000	USD
CY2014Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	30459000	USD
CY2015Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	23577000	USD
CY2013	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	296935000	USD
CY2014Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	74925000	USD
CY2014Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	76087000	USD
CY2014Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	77133000	USD
CY2014Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	79897000	USD
CY2014	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	308042000	USD
CY2015Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	81417000	USD
CY2015Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	82040000	USD
CY2015Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	82665000	USD
CY2015Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	82769000	USD
CY2015	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	328891000	USD
CY2013	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	266284000	USD
CY2014	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	268279000	USD
CY2015	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	286166000	USD
CY2014Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	4273349000	USD
CY2015Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	3931471000	USD
CY2014Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	16949000	USD
CY2015Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	8373000	USD
CY2014Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	1304258000	USD
CY2015Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	925909000	USD
CY2013	us-gaap	Interest Expense InterestExpense	5840000	USD
CY2014Q1	us-gaap	Interest Expense InterestExpense	985000	USD
CY2014Q2	us-gaap	Interest Expense InterestExpense	963000	USD
CY2014Q3	us-gaap	Interest Expense InterestExpense	913000	USD
CY2014Q4	us-gaap	Interest Expense InterestExpense	1133000	USD
CY2014	us-gaap	Interest Expense InterestExpense	3994000	USD
CY2015Q1	us-gaap	Interest Expense InterestExpense	1053000	USD
CY2015Q2	us-gaap	Interest Expense InterestExpense	1030000	USD
CY2015Q3	us-gaap	Interest Expense InterestExpense	971000	USD
CY2015Q4	us-gaap	Interest Expense InterestExpense	950000	USD
CY2015	us-gaap	Interest Expense InterestExpense	4004000	USD
CY2013	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3962000	USD
CY2014	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3005000	USD
CY2015	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2977000	USD
CY2013	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	-404000	USD
CY2014	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	396000	USD
CY2015	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	474000	USD
CY2013	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	734000	USD
CY2014	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	593000	USD
CY2015	us-gaap	Interest Expense Other Short Term Borrowings InterestExpenseOtherShortTermBorrowings	553000	USD
CY2013	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	355000	USD
CY2014	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	179000	USD
CY2015	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	109000	USD
CY2013	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	291196000	USD
CY2014	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	297321000	USD
CY2015	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	316296000	USD
CY2013	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	291095000	USD
CY2014Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	73940000	USD
CY2014Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	75124000	USD
CY2014Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	76220000	USD
CY2014Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	78764000	USD
CY2014	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	304048000	USD
CY2015Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	80364000	USD
CY2015Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	81010000	USD
CY2015Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	81694000	USD
CY2015Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	81819000	USD
CY2015	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	324887000	USD
CY2013	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	9837000	USD
CY2014	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	10830000	USD
CY2015	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	11842000	USD
CY2013	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	20459000	USD
CY2014	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	28754000	USD
CY2015	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	30774000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	5962000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	3904000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	4146000	USD
CY2014Q4	us-gaap	Interest Receivable InterestReceivable	27802000	USD
CY2015Q4	us-gaap	Interest Receivable InterestReceivable	27877000	USD
CY2013	us-gaap	Labor And Related Expense LaborAndRelatedExpense	125432000	USD
CY2014	us-gaap	Labor And Related Expense LaborAndRelatedExpense	130864000	USD
CY2015	us-gaap	Labor And Related Expense LaborAndRelatedExpense	149410000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	7350671000	USD
CY2015Q4	us-gaap	Liabilities Liabilities	7709569000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8578846000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8951697000	USD
CY2012Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	82300000	USD
CY2013Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	72454000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	69569000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	68172000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	59374000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	42373000	USD
CY2013	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2900000	USD
CY2014	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2200000	USD
CY2015	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	1300000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	5445378000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	5815027000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	5375809000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	5746855000	USD
CY2014Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	13200000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	10000000	USD
CY2015	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	0	USD
CY2015	us-gaap	Loans And Leases Receivable Related Parties Collections LoansAndLeasesReceivableRelatedPartiesCollections	3200000	USD
CY2014Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	1116000	USD
CY2015Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	4509000	USD
CY2015Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1300000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-132941000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	392952000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	275430000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-281060000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-521961000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-423054000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	79636000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	137618000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	134756000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	60016000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	19844000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	21227000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	21583000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	18920000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	81574000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	24361000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	21946000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	25780000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	26740000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	98827000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	59407000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	80640000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	97577000	USD
CY2014Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	2651373000	USD
CY2015Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	3507358000	USD
CY2014Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2651373000	USD
CY2015Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	3507358000	USD
CY2013	us-gaap	Noninterest Expense NoninterestExpense	230886000	USD
CY2014Q1	us-gaap	Noninterest Expense NoninterestExpense	57386000	USD
CY2014Q2	us-gaap	Noninterest Expense NoninterestExpense	57764000	USD
CY2014Q3	us-gaap	Noninterest Expense NoninterestExpense	59982000	USD
CY2014Q4	us-gaap	Noninterest Expense NoninterestExpense	64154000	USD
CY2014	us-gaap	Noninterest Expense NoninterestExpense	239286000	USD
CY2015Q1	us-gaap	Noninterest Expense NoninterestExpense	66734000	USD
CY2015Q2	us-gaap	Noninterest Expense NoninterestExpense	68471000	USD
CY2015Q3	us-gaap	Noninterest Expense NoninterestExpense	64067000	USD
CY2015Q4	us-gaap	Noninterest Expense NoninterestExpense	66877000	USD
CY2015	us-gaap	Noninterest Expense NoninterestExpense	266149000	USD
CY2013	us-gaap	Noninterest Income NoninterestIncome	26700000	USD
CY2014Q1	us-gaap	Noninterest Income NoninterestIncome	14008000	USD
CY2014Q2	us-gaap	Noninterest Income NoninterestIncome	14627000	USD
CY2014Q3	us-gaap	Noninterest Income NoninterestIncome	15930000	USD
CY2014Q4	us-gaap	Noninterest Income NoninterestIncome	15185000	USD
CY2014	us-gaap	Noninterest Income NoninterestIncome	59750000	USD
CY2015Q1	us-gaap	Noninterest Income NoninterestIncome	22767000	USD
CY2015Q2	us-gaap	Noninterest Income NoninterestIncome	21462000	USD
CY2015Q3	us-gaap	Noninterest Income NoninterestIncome	22499000	USD
CY2015Q4	us-gaap	Noninterest Income NoninterestIncome	24745000	USD
CY2015	us-gaap	Noninterest Income NoninterestIncome	91473000	USD
CY2013	us-gaap	Noninterest Income Other NoninterestIncomeOther	10522000	USD
CY2014	us-gaap	Noninterest Income Other NoninterestIncomeOther	11834000	USD
CY2015	us-gaap	Noninterest Income Other NoninterestIncomeOther	18605000	USD
CY2013	us-gaap	Occupancy Net OccupancyNet	33054000	USD
CY2014	us-gaap	Occupancy Net OccupancyNet	32300000	USD
CY2015	us-gaap	Occupancy Net OccupancyNet	34818000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	39762000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	6774000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3810000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4606000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	4983000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5621000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	13968000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8500000	USD
CY2014	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8300000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	7400000	USD
CY2013	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	673000	USD
CY2014	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	756000	USD
CY2015	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	1100000	USD
CY2014Q4	us-gaap	Other Assets OtherAssets	231877000	USD
CY2015Q4	us-gaap	Other Assets OtherAssets	235854000	USD
CY2014Q4	us-gaap	Other Borrowings OtherBorrowings	8200000	USD
CY2014Q4	us-gaap	Other Borrowings OtherBorrowings	8248000	USD
CY2015Q4	us-gaap	Other Borrowings OtherBorrowings	0	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	780000	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	2878000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	265000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	95000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	214000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-135000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-54000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-122000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-31026000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	17570000	USD
CY2014	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-7076000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-32159000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	17922000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-11123000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-32193000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	17665000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-11916000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-32193000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	17665000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11916000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	1432000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	5054000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1167000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-95000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	4840000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	299000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	352000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1007000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	163000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	200000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	574000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-30727000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	17922000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-6069000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-17498000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	10200000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-3455000	USD
CY2014Q4	us-gaap	Other Liabilities OtherLiabilities	96053000	USD
CY2015Q4	us-gaap	Other Liabilities OtherLiabilities	102510000	USD
CY2013	us-gaap	Other Noninterest Expense OtherNoninterestExpense	29962000	USD
CY2014	us-gaap	Other Noninterest Expense OtherNoninterestExpense	27045000	USD
CY2015	us-gaap	Other Noninterest Expense OtherNoninterestExpense	30521000	USD
CY2013	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	3577000	USD
CY2014	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	0	USD
CY2015	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	0	USD
CY2014	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	1422000000	USD
CY2013	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	1313000000	USD
CY2015	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	1850000000	USD
CY2013	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	43046000	USD
CY2014	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	23344000	USD
CY2015	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	75689000	USD
CY2013	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	161827000	USD
CY2014	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	440376000	USD
CY2015	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	384321000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	429000	USD
CY2014	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	622000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	906000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19858000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	49494000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	77263000	USD
CY2013	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	32000	USD
CY2014	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	96000	USD
CY2015	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	137000	USD
CY2013	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	457985000	USD
CY2014	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	363693000	USD
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	467631000	USD
CY2013	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2014	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2015	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	16760000	USD
CY2013	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	919000	USD
CY2014	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2015	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13133000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12485000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7581000	USD
CY2013	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	0.31
CY2014	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	0.94
CY2015	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	1.34
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2015Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2014Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	9000	shares
CY2015Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	9000	shares
CY2014Q4	us-gaap	Preferred Stock Value PreferredStockValue	2217000	USD
CY2015Q4	us-gaap	Preferred Stock Value PreferredStockValue	2217000	USD
CY2013	us-gaap	Proceeds From Federal Home Loan Bank Advances ProceedsFromFederalHomeLoanBankAdvances	1215100000	USD
CY2014	us-gaap	Proceeds From Federal Home Loan Bank Advances ProceedsFromFederalHomeLoanBankAdvances	1602000000	USD
CY2015	us-gaap	Proceeds From Federal Home Loan Bank Advances ProceedsFromFederalHomeLoanBankAdvances	1702000000	USD
CY2013	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	50000	USD
CY2014	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	800000	USD
CY2015	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1010000	USD
CY2013	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	293940000	USD
CY2014	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	180648000	USD
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	283206000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	95375000	USD
CY2013	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	166881000	USD
CY2014	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	63292000	USD
CY2015Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	13738000	USD
CY2014Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	22190000	USD
CY2013	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	1114000	USD
CY2014	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	1288000	USD
CY2015	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	37403000	USD
CY2013	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	36453000	USD
CY2014	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	28559000	USD
CY2015	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	19387000	USD
CY2013	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	44874000	USD
CY2014	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	23573000	USD
CY2015	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	72296000	USD
CY2014	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	28559000	USD
CY2015	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	19292000	USD
CY2013	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1092000	USD
CY2014	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	929000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1258000	USD
CY2013	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	0	USD
CY2014	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	5000000	USD
CY2015	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	0	USD
CY2013	us-gaap	Professional Fees ProfessionalFees	12338000	USD
CY2014	us-gaap	Professional Fees ProfessionalFees	11389000	USD
CY2015	us-gaap	Professional Fees ProfessionalFees	9608000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	221525000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	221401000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	172090000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	164239000	USD
CY2013	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-101000	USD
CY2014Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1922000	USD
CY2014Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2117000	USD
CY2014Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	980000	USD
CY2014Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1708000	USD
CY2014	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6727000	USD
CY2015Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1209000	USD
CY2015Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2202000	USD
CY2015Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2831000	USD
CY2015Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2349000	USD
CY2015	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	8591000	USD
CY2013Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	35927000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	34000	USD
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	257000	USD
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	793000	USD
CY2013	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	50000	USD
CY2014	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	800000	USD
CY2015	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1010000	USD
CY2013	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	51000000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	234498000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	255925000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	2844000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	2859000	USD
CY2014	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	14636000	USD
CY2015	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	8248000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	20.24
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	21.92
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	2500000	USD
CY2015Q4	us-gaap	Secured Borrowings Gross Difference Amount SecuredBorrowingsGrossDifferenceAmount	0	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	2300000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	2800000	USD
CY2015Q4	us-gaap	Secured Borrowings Gross Including Not Subject To Master Netting Arrangement SecuredBorrowingsGrossIncludingNotSubjectToMasterNettingArrangement	99699000	USD
CY2014Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	105080000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	16.90
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	21.45
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	24.79
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	203441	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	21.55
CY2015Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	99699000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1800000	shares
CY2014Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	105080000	USD
CY2015Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	99699000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	44686	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	28510	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	57.26
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	410000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	28315	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	138000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	85000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	17027	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	6387	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	222110	shares
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	4090000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	59780	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	108371	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	131775	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	246068	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	306007	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	20.78
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	25.97
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	28.57
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	384090	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	410598	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	519785	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	665702	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	19.54
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	20.79
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	23.03
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	25.80
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	117153	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.06
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	403000	USD
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	75998	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	44686	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	62.41
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	57.26
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	403000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	44686	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	57.26
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	88.76
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	79.60
CY2015Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	44686	shares
CY2015Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	44686	shares
CY2015Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	403000	USD
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	20.82
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y1M25D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y1M25D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P2Y1M25D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	0	shares
CY2015Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	57.26
CY2015Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	57.26
CY2015	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P2Y1M25D
CY2013	us-gaap	Stock Issued1 StockIssued1	276181000	USD
CY2014	us-gaap	Stock Issued1 StockIssued1	116907000	USD
CY2015	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2013	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	32598	shares
CY2014	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	34168	shares
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	42134	shares
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	7898	shares
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	686000	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	904000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1200000	USD
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	276181000	USD
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	116907000	USD
CY2013	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2693000	USD
CY2014	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2859000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	4090000	USD
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1243000	USD
CY2014	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	929000	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1258000	USD
CY2013	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	429000	USD
CY2014	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	622000	USD
CY2015	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	906000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	764008000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	1053249000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1228175000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	1242128000	USD
CY2015	us-gaap	Subordinated Borrowing Interest Rate SubordinatedBorrowingInterestRate	0.0303
CY2014Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	817805000	USD
CY2015Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	853182000	USD
CY2014Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	309579000	USD
CY2015Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	340420000	USD
CY2014Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2015Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2014Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1057
CY2015Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1003
CY2014Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	817805000	USD
CY2015Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	853182000	USD
CY2014Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	251995000	USD
CY2015Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	428493000	USD
CY2014Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.040
CY2015Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.060
CY2014Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1298
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49051000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53183000	shares
CY2015Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	182973000	USD
CY2014Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	288261000	USD
CY2015Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1195
CY2015Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	249031000	USD
CY2013	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	18100000	USD
CY2014	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	10200000	USD
CY2015	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	8688000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0	USD
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1058000	shares
CY2014	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	565000	shares
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	13000	shares
CY2015Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	221000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	6803000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	4161000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	168149000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	4837000	USD
CY2015Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	25703000	USD
CY2015Q4	us-gaap	Time Deposits TimeDeposits	209874000	USD
CY2014Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	202014000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	57032000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47993000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	52618000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	57019000	shares
CY2015	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Advertising</font></div><div style="line-height:120%;padding-top:12px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;"></font><font style="font-family:inherit;font-size:10pt;">Advertising costs are generally expensed as incurred. </font></div></div>

Files In Submission

Name	View Source	Status
0000887343-16-000045-index-headers.html	Edgar Link	pending
0000887343-16-000045-index.html	Edgar Link	pending
0000887343-16-000045.txt	Edgar Link	pending
0000887343-16-000045-xbrl.zip	Edgar Link	pending
colb-20151231.xml	Edgar Link	completed
colb-20151231.xsd	Edgar Link	pending
colb-20151231_cal.xml	Edgar Link	unprocessable
colb-20151231_def.xml	Edgar Link	unprocessable
colb-20151231_lab.xml	Edgar Link	unprocessable
colb-20151231_pre.xml	Edgar Link	unprocessable
colb2014pub10-k_charta01.jpg	Edgar Link	pending
colb2015ex1042.htm	Edgar Link	pending
colb2015ex12.htm	Edgar Link	pending
colb2015ex21.htm	Edgar Link	pending
colb2015ex23.htm	Edgar Link	pending
colb2015ex24.htm	Edgar Link	pending
colb2015ex311.htm	Edgar Link	pending
colb2015ex312.htm	Edgar Link	pending
colb2015ex32.htm	Edgar Link	pending
colb2015pub10-k.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb

2015 Q4 Form 10-K Financial Statement

#000088734316000045 Filed on February 29, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB COLUMBIA BANKING SYSTEM, INC. Stock $colb

2015 Q4 Form 10-K Financial Statement

#000088734316000045 Filed on February 29, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COLB
COLUMBIA BANKING SYSTEM, INC. Stock $colb