$CASS
CASS INFORMATION SYSTEMS INC Stock $cass

$cass Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000120677420000650 Filed on February 28, 2020

Income Statement

Concept	2018 Q4	2018 Q3	2018 Q2
Revenue	$12.91M	$37.62M	$36.36M
YoY Change	-63.86%	7.89%	6.53%
Cost Of Revenue	$1.230M	$1.030M	$790.0K
YoY Change	83.58%	80.7%	68.09%
Gross Profit	$38.30M	$37.62M	$36.36M
YoY Change	9.27%	9.68%	8.02%
Gross Profit Margin	296.67%	100.0%	100.0%
Selling, General & Admin	$24.59M	$24.16M	$23.92M
YoY Change	11.12%	12.01%	12.56%
% of Gross Profit	64.2%	64.22%	65.79%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.720M	$2.700M	$2.800M
YoY Change	-8.72%	-6.57%	1.08%
% of Gross Profit	7.1%	7.18%	7.7%
Operating Expenses	$29.75M	$28.53M	$27.47M
YoY Change	13.81%	13.94%	10.32%
Operating Profit	$8.550M	$9.090M	$8.890M
YoY Change	-4.04%	-1.84%	1.48%
Interest Expense	$1.234M	$1.029M	$794.0K
YoY Change
% of Operating Profit	14.43%	11.32%	8.93%
Other Income/Expense, Net
YoY Change
Pretax Income	$8.560M	$9.654M	$9.520M
YoY Change	-3.93%	4.25%	-6.77%
Income Tax	$1.502M	$1.481M	$1.387M
% Of Pretax Income	17.55%	15.34%	14.57%
Net Earnings	$7.057M	$7.610M	$7.509M
YoY Change	32.4%	10.93%	15.35%
Net Earnings / Revenue	54.66%	20.23%	20.65%
Basic Earnings Per Share	$0.48	$0.52	$0.51
Diluted Earnings Per Share	$0.47	$0.51	$0.50
COMMON SHARES
Basic Shares Outstanding		14.70M shares	14.69M shares
Diluted Shares Outstanding		14.94M shares	14.93M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$194.3M	$157.6M	$124.3M
YoY Change	14.63%	50.38%	8.56%
Cash & Equivalents	$230.9M	$180.0M	$126.2M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$194.3M	$157.6M	$124.3M
YoY Change	14.63%	50.38%	8.56%
LONG-TERM ASSETS
Property, Plant & Equipment	$22.03M	$22.60M	$22.50M
YoY Change	2.0%	6.6%	5.63%
Goodwill	$12.57M	$12.57M	$12.57M
YoY Change	0.0%
Intangibles	$1.554M
YoY Change
Long-Term Investments	$478.1M	$468.8M	$442.8M
YoY Change	-9.66%	-21.13%	-28.41%
Other Assets
YoY Change
Total Long-Term Assets	$1.501B	$1.521B	$1.446B
YoY Change	4.68%	4.73%	-2.22%
TOTAL ASSETS
Total Short-Term Assets	$194.3M	$157.6M	$124.3M
Total Long-Term Assets	$1.501B	$1.521B	$1.446B
Total Assets	$1.695B	$1.678B	$1.570B
YoY Change	5.74%	7.8%	-1.44%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$694.4M	$769.6M	$673.7M
YoY Change	-3.0%	11.99%	-7.64%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt		$364.3M	$360.4M
YoY Change		-8.42%	-10.59%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.416B	$1.404B	$1.300B
YoY Change	1.61%	8.32%	-2.62%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$49.00M	$44.50M	$44.30M
YoY Change	28.61%	22.59%	18.13%
Total Long-Term Liabilities	$49.00M	$44.50M	$44.30M
YoY Change	28.61%	22.59%	18.13%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.416B	$1.404B	$1.300B
Total Long-Term Liabilities	$49.00M	$44.50M	$44.30M
Total Liabilities	$1.465B	$1.449B	$1.344B
YoY Change	2.32%	8.71%	-2.06%
SHAREHOLDERS EQUITY
Retained Earnings	$75.17M
YoY Change
Common Stock	$213.5M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$39.97M
YoY Change
Treasury Stock Shares	894.5K shares
Shareholders Equity	$229.8M	$229.3M	$226.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.695B	$1.678B	$1.570B
YoY Change	2.29%	7.8%	-1.44%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$7.057M	$7.610M	$7.509M
YoY Change	32.4%	10.93%	15.35%
Depreciation, Depletion And Amortization	$2.720M	$2.700M	$2.800M
YoY Change	-8.72%	-6.57%	1.08%
Cash From Operating Activities	$9.540M	$13.70M	$6.940M
YoY Change	-12.88%	111.75%	-56.21%
INVESTING ACTIVITIES
Capital Expenditures	-$440.0K	-$1.160M	-$1.410M
YoY Change	-67.41%	38.1%	34.29%
Acquisitions
YoY Change
Other Investing Activities	$13.78M	-$28.61M	$2.830M
YoY Change	-121.38%	31.24%	-77.23%
Cash From Investing Activities	$13.34M	-$29.77M	$1.410M
YoY Change	-120.28%	31.43%	-87.62%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	28.00M	69.92M	-81.74M
YoY Change	-31.46%	-263.44%	-162.75%
NET CHANGE
Cash From Operating Activities	9.540M	13.70M	6.940M
Cash From Investing Activities	13.34M	-29.77M	1.410M
Cash From Financing Activities	28.00M	69.92M	-81.74M
Net Change In Cash	50.88M	53.85M	-73.39M
YoY Change	-463.69%	-191.33%	-146.6%
FREE CASH FLOW
Cash From Operating Activities	$9.540M	$13.70M	$6.940M
Capital Expenditures	-$440.0K	-$1.160M	-$1.410M
Free Cash Flow	$9.980M	$14.86M	$8.350M
YoY Change	-18.86%	103.28%	-50.59%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	cass	Bank Service Fees BankServiceFees	1386000	USD
CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	18076000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	15042000	USD
CY2019Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	172422000	USD
CY2018Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	179281000	USD
CY2019Q4	cass	Federal Funds Sold And Other Short Term Investments FederalFundsSoldAndOtherShortTermInvestments	13456000	USD
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000708781
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	702445000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	14552402	shares
CY2018Q4	cass	Federal Funds Sold And Other Short Term Investments FederalFundsSoldAndOtherShortTermInvestments	36610000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203954000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	422665000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	441534000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	772638000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10556000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	762082000	USD
CY2019Q4	cass	Payments In Excess Of Funding PaymentsInExcessOfFunding	206158000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20527000	USD
CY2019Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	17599000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	14262000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4281000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	112715000	USD
CY2019Q4	us-gaap	Assets Assets	1764243000	USD
CY2019Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	351091000	USD
CY2019Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	406045000	USD
CY2019Q4	us-gaap	Deposits Deposits	757136000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Noncurrent AccountsPayableAndAccruedLiabilitiesNoncurrent	684295000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	18000000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	60622000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1520053000	USD
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.50
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
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CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
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CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	15505772	shares
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2018Q4	cass	Payments In Excess Of Funding PaymentsInExcessOfFunding	160777000	USD
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CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24716000	USD
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CY2017	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss		USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3006000	USD
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CY2018	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2017	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3521000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3997000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3026000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4656000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-5794000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4127000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	48335000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	38890000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	58520000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities		USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	38116000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	44156000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	124777000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	21335000	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross		USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	90341000	USD
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	991406	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	894486	shares
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	45381000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-13920000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	244190000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1764243000	USD
CY2019	cass	Information Services Payment And Processing Revenue InformationServicesPaymentAndProcessingRevenue	107953000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	47926000	USD
CY2019	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	2000	USD
CY2019	us-gaap	Interest Expense InterestExpense	5193000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	47416000	USD
CY2019	us-gaap	Equipment Expense EquipmentExpense	6140000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	563000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	18065000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	119769000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	37466000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.11
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13429000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3196000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	19000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	5000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	6903000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1643000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-7000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4952000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5552000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35356000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	10939000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	19000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	3144000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	250000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1247000	USD
CY2017	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	8008000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4359000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	42126000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4648000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	21502000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	82022000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	50970000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	35336000	USD
CY2019	cass	Increase Decrease In Payments In Excess Of Funding IncreaseDecreaseInPaymentsInExcessOfFunding	45381000	USD
CY2018	cass	Increase Decrease In Payments In Excess Of Funding IncreaseDecreaseInPaymentsInExcessOfFunding	21674000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2723000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4399000	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	2833000	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross		USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-46795000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	3746000	USD
CY2019	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	-1370000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-988000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	228110000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	2178000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7677000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Other Operating Liabilities IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities	19601000	USD
CY2017	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt		USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10675000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2270000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-467000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	62316000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	266743000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203954000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	230933000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	229848000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.05
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15234000	USD
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	34810	shares
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-59000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1066000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3144000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	7799000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4952000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	244190000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	12000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	17593000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	157000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	21394000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	169000	USD
CY2019	cass	Increase Decrease In Non Interest Bearing Demand Deposits IncreaseDecreaseInNonInterestBearingDemandDeposits	37833000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10675000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	8000	USD
CY2017	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	29378	shares
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-548000	USD
CY2019	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	-1133000	USD
CY2018	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	-7838000	USD
CY2017	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	-7472000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	19959000	USD
CY2017	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-3286000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Other Operating Liabilities IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities	-22400000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Other Operating Liabilities IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities	-19595000	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	18000000	USD
CY2018	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt		USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15234000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	13177000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7799000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	8838000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1125000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-945000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	6652000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1283000	USD
CY2019	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-26979000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	2823000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-38633000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	230933000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	228110000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	5181000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	3701000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7604000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6723000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	208035000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	25014000	USD
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.72
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	309000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2340000	USD
CY2017	us-gaap	Stock Issued During Period Shares Purchase Of Assets StockIssuedDuringPeriodSharesPurchaseOfAssets	50215	shares
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2270000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3509000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax		USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	225088000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	30268000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.89
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	13177000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	5000	USD
CY2018	us-gaap	Stock Issued During Period Shares Share Based Compensation Gross StockIssuedDuringPeriodSharesShareBasedCompensationGross	33039	shares
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-367000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	575000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3006000	USD
CY2018	us-gaap	Stock Issued During Period Shares Purchase Of Assets StockIssuedDuringPeriodSharesPurchaseOfAssets	169143	shares
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	8838000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5552000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: Times New Roman, Times, serif; font-size:10pt; text-align:justify; margin-top:11pt; margin-bottom: 0pt;color:#000000; "> <span style="font-weight: bold; font-style: italic; ">Use of Estimates</span> In preparing the consolidated financial statements, Company management is required to make estimates and assumptions which significantly affect the reported amounts in the consolidated financial statements. </p>
CY2019Q4	cass	Percentage Holding Required To Account Investments Non Marketable Equity Investments PercentageHoldingRequiredToAccountInvestmentsNonMarketableEquityInvestments	0.20	pure
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7808000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7383000	USD
CY2019Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	52786000	USD
CY2019Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	408600000	USD
CY2019Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	14234000	USD
CY2019Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	169000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	422665000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	440880000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3877000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3223000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	441534000	USD
CY2019Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	3801000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	121657000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	686000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	98551000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	2537000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	220208000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	3223000	USD
CY2019Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	9	pure
CY2019Q4	cass	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Percentage AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosurePercentage	0.03	pure
CY2019Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	7	pure
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	136	pure
CY2018Q4	cass	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Percentage AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosurePercentage	0.43	pure
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	61	pure
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	51219000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	51485000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	97799000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	100179000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	222143000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	233289000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	37439000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	37712000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost		USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue		USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	408600000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	422665000	USD
CY2019Q4	cass	Proceeds From Purchase Of State And Political Subdivisions ProceedsFromPurchaseOfStateAndPoliticalSubdivisions	6408000	USD
CY2018Q4	cass	Proceeds From Purchase Of State And Political Subdivisions ProceedsFromPurchaseOfStateAndPoliticalSubdivisions	6857000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	0	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	4648000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	58520000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities		USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Accrual Of Interest LoansAndLeasesReceivableImpairedNonperformingAccrualOfInterest	0	USD
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	0	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	0	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	0	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	0	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	166000	USD
CY2019	cass	Income Recognized On Nonaccrual Loans Under Original Terms Of Contract IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract	0	USD
CY2018Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	721587000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	0	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	0	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	0	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Nonaccrual Of Interest LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest	0	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Nonperforming Accrual Of Interest LoansAndLeasesReceivableImpairedNonperformingAccrualOfInterest	0	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	250000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10556000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10205000	USD
CY2019	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	19000	USD
CY2018	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	180000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	0	USD
CY2019	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2018	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	222000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2019Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	772638000	USD
CY2018Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	721587000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus		USD
CY2019Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	772638000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus		USD
CY2018Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	721587000	USD
CY2019Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	772638000	USD
CY2018	cass	Income Recognized On Nonaccrual Loans Under Original Terms Of Contract IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract	0	USD
CY2017	cass	Income Recognized On Nonaccrual Loans Under Original Terms Of Contract IncomeRecognizedOnNonaccrualLoansUnderOriginalTermsOfContract	24000	USD
CY2019	cass	Income Recognized On Nonaccrual Loans IncomeRecognizedOnNonaccrualLoans	0	USD
CY2018	cass	Income Recognized On Nonaccrual Loans IncomeRecognizedOnNonaccrualLoans	0	USD
CY2017	cass	Income Recognized On Nonaccrual Loans IncomeRecognizedOnNonaccrualLoans	17000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	0	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount Covered And Not Covered LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCovered	0	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	0	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	0	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs		USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10225000	USD
CY2019	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	81000	USD
CY2018	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs		USD
CY2018	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	20000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses		USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10225000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	167429	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	278153	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	47881000	USD
CY2019Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year One TimeDepositsWeightedAverageInterestRateMaturitiesYearOne	0.675	pure
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	52336000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	56897000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	31809000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	34866000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20527000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22031000	USD
CY2019	us-gaap	Depreciation Depreciation	4227000	USD
CY2018	us-gaap	Depreciation Depreciation	3954000	USD
CY2017	us-gaap	Depreciation Depreciation	3624000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	14489000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	227000	USD
CY2018Q4	us-gaap	Goodwill Gross GoodwillGross	12796000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	227000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	23205000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4662000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18222000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4099000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	563000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	442000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	427000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	859000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	859000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	540000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	540000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	498000	USD
CY2017	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	79000	USD
CY2019Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	322027000	USD
CY2018Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	322709000	USD
CY2019Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	13051000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	13502000	USD
CY2019Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	4927000	USD
CY2018Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	4862000	USD
CY2019Q4	cass	Time Deposits100000 Or More And Less Than250000 TimeDeposits100000OrMoreAndLessThan250000	48353000	USD
CY2018Q4	cass	Time Deposits100000 Or More And Less Than250000 TimeDeposits100000OrMoreAndLessThan250000	51658000	USD
CY2019Q4	cass	Time Deposits250000 Or More TimeDeposits250000OrMore	17687000	USD
CY2018Q4	cass	Time Deposits250000 Or More TimeDeposits250000OrMore	15937000	USD
CY2019Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	406045000	USD
CY2018Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	408668000	USD
CY2019Q4	cass	Weighted Average Interest Rate Of Interest Bearing Deposits WeightedAverageInterestRateOfInterestBearingDeposits	0.0132	pure
CY2018Q4	cass	Weighted Average Interest Rate Of Interest Bearing Deposits WeightedAverageInterestRateOfInterestBearingDeposits	0.0100	pure
CY2019	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	3686000	USD
CY2018	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	2832000	USD
CY2017	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	1611000	USD
CY2019	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	103000	USD
CY2018	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	109000	USD
CY2019	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	905000	USD
CY2018	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	433000	USD
CY2017	us-gaap	Interest Expense Time Deposits Less Than100000 InterestExpenseTimeDepositsLessThan100000	234000	USD
CY2019	cass	Interest Expense Time Deposits100000 Or More And Less Than250000 InterestExpenseTimeDeposits100000OrMoreAndLessThan250000	216000	USD
CY2018	cass	Interest Expense Time Deposits100000 Or More And Less Than250000 InterestExpenseTimeDeposits100000OrMoreAndLessThan250000	152000	USD
CY2017	cass	Interest Expense Time Deposits100000 Or More And Less Than250000 InterestExpenseTimeDeposits100000OrMoreAndLessThan250000	114000	USD
CY2019	cass	Interest Expense Time Deposits250000 Or More InterestExpenseTimeDeposits250000OrMore	281000	USD
CY2018	cass	Interest Expense Time Deposits250000 Or More InterestExpenseTimeDeposits250000OrMore	210000	USD
CY2017	cass	Interest Expense Time Deposits250000 Or More InterestExpenseTimeDeposits250000OrMore	149000	USD
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	5191000	USD
CY2018	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3736000	USD
CY2017	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2187000	USD
CY2018Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	51154000	USD
CY2018Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year One TimeDepositsWeightedAverageInterestRateMaturitiesYearOne	0.706	pure
CY2019Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	15813000	USD
CY2019Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Two TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo	0.223	pure
CY2018Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	18262000	USD
CY2018Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Two TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo	0.252	pure
CY2019Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	5584000	USD
CY2019Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Three TimeDepositsWeightedAverageInterestRateMaturitiesYearThree	0.078	pure
CY2018Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	140000	USD
CY2018Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Three TimeDepositsWeightedAverageInterestRateMaturitiesYearThree	0.002	pure
CY2019Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	1689000	USD
CY2019Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Four TimeDepositsWeightedAverageInterestRateMaturitiesYearFour	0.024	pure
CY2018Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	983000	USD
CY2018Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Four TimeDepositsWeightedAverageInterestRateMaturitiesYearFour	0.014	pure
CY2019Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive		USD
CY2019Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Five TimeDepositsWeightedAverageInterestRateMaturitiesYearFive		pure
CY2018Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	1918000	USD
CY2018Q4	us-gaap	Time Deposits Weighted Average Interest Rate Maturities Year Five TimeDepositsWeightedAverageInterestRateMaturitiesYearFive	0.026	pure
CY2019Q4	us-gaap	Time Deposits TimeDeposits	70967000	USD
CY2019Q4	cass	Time Deposits Weighted Average Interest Rate Aggregate TimeDepositsWeightedAverageInterestRateAggregate	1.000	pure
CY2018Q4	us-gaap	Time Deposits TimeDeposits	72457000	USD
CY2018Q4	cass	Time Deposits Weighted Average Interest Rate Aggregate TimeDepositsWeightedAverageInterestRateAggregate	1.000	pure
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	18000000	USD
CY2018Q4	us-gaap	Line Of Credit LineOfCredit		USD
CY2018Q4	us-gaap	Shares Outstanding SharesOutstanding	14611286	shares
CY2019	us-gaap	Stock Issued During Period Shares Restricted Stock Award Gross StockIssuedDuringPeriodSharesRestrictedStockAwardGross	18121	shares
CY2019	cass	Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Exercises In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndStockAppreciationRightsExercisesInPeriod	27274	shares
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	12278	shares
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	154593	shares
CY2019Q4	us-gaap	Shares Outstanding SharesOutstanding	14514366	shares
CY2018	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	-4506000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	6900000	USD
CY2018	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer		USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2565000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14915890	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.03
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.68
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	30268000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	25014000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14434445	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14675136	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14700558	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.11
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.06
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.70
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	30268000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	25014000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14434445	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14675136	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	257480	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	239066	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	215332	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14691925	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14914202	shares
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	96401000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	98790000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	3554000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4017000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	4103000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	3703000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	18334000	USD
CY2018	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-7768000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2565000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2341000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	119827000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	96401000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	74580000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	81427000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	15719000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2341000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	94634000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	74580000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-25192000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-21821000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	3098000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	3367000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	3766000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	4196000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	4488000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	27343000	USD
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0430	pure
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0375	pure
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0425	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease		pure
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease		pure
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease		pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0650	pure
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0650	pure
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0650	pure
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	94634000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	74580000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1378000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1109000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	925000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	1500000	shares
CY2019	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	3144000	USD
CY2018	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	3006000	USD
CY2017	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2340000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3404000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1638000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1097000	USD
CY2019	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	1875000	USD
CY2018	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	2180000	USD
CY2017	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	2087000	USD
CY2019	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	3838000	USD
CY2018	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	3344000	USD
CY2017	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	2557000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	2388000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	2170000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	1650000	USD
CY2019	cass	Outside Service Fees OutsideServiceFees	5529000	USD
CY2018	cass	Outside Service Fees OutsideServiceFees	4909000	USD
CY2017	cass	Outside Service Fees OutsideServiceFees	4424000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1283000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	919000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	897000	USD
CY2019	us-gaap	Communication Communication	748000	USD
CY2018	us-gaap	Communication Communication	778000	USD
CY2017	us-gaap	Communication Communication	749000	USD
CY2019	us-gaap	Other Expenses OtherExpenses	2404000	USD
CY2018	us-gaap	Other Expenses OtherExpenses	1963000	USD
CY2017	us-gaap	Other Expenses OtherExpenses	1722000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	18065000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16263000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	14086000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4423000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	8557000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4250000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1392000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1043000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-805000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4256000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	150000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-117000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-259000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6079000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9885000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7868000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7633000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	12214000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1755000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	2009000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3868000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1218000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	732000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	896000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-281000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-286000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-376000	USD
CY2019	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability		USD
CY2018	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	-74000	USD
CY2017	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	1824000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	12000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	83000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6079000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9885000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6079000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9885000	USD
CY2019	cass	Percentage Of Pretax Income Tax Rate PercentageOfPretaxIncomeTaxRate	0.19	pure
CY2018	cass	Percentage Of Pretax Income Tax Rate PercentageOfPretaxIncomeTaxRate	0.17	pure
CY2017	cass	Percentage Of Pretax Income Tax Rate PercentageOfPretaxIncomeTaxRate	0.28	pure
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2452000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2376000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7642000	USD
CY2017	cass	Unrecognized Tax Benefits Decreases Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesIncreasesResultingFromPriorPeriodTaxPositions	-15000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	171000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	192000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	263000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	331000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	286000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	6000000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	27000	USD
CY2018Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	50000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	2087000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1968000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1987000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1673000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	14195000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	12067000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2821000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1937000	USD
CY2019Q4	cass	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	974000	USD
CY2018Q4	cass	Deferred Tax Liabilities Pension Costs DeferredTaxLiabilitiesPensionCosts	409000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	1379000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	1212000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	3348000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	156000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	196000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	80000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	8718000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3794000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	5477000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	8273000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1403000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1632000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1623000	USD
CY2019	cass	Unrecognized Tax Benefits Decreases Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesIncreasesResultingFromPriorPeriodTaxPositions	56000	USD
CY2018	cass	Unrecognized Tax Benefits Decreases Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesIncreasesResultingFromPriorPeriodTaxPositions	-135000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	239000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1299000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1403000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1632000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1184000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1272000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1464000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	151000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	136000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	139000	USD
CY2019	cass	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations Over12 Months UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsOver12Months	315000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	203954000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	203954000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	230933000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	230933000	USD
CY2019Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	422665000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	422665000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	441534000	USD
CY2018Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	441534000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	762082000	USD
CY2019Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	776653000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	711362000	USD
CY2018Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	711090000	USD
CY2019Q4	us-gaap	Interest Receivable InterestReceivable	6706000	USD
CY2019Q4	us-gaap	Accounts Receivable Fair Value Disclosure AccountsReceivableFairValueDisclosure	6706000	USD
CY2018Q4	us-gaap	Interest Receivable InterestReceivable	7069000	USD
CY2018Q4	us-gaap	Accounts Receivable Fair Value Disclosure AccountsReceivableFairValueDisclosure	7069000	USD
CY2019Q4	cass	Assets Carrying Amount AssetsCarryingAmount	1395407000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1409978000	USD
CY2018Q4	cass	Assets Carrying Amount AssetsCarryingAmount	1390898000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1390626000	USD
CY2019Q4	us-gaap	Deposits Deposits	757136000	USD
CY2019Q4	us-gaap	Deposits Fair Value Disclosure DepositsFairValueDisclosure	757790000	USD
CY2018Q4	us-gaap	Deposits Deposits	721926000	USD
CY2018Q4	us-gaap	Deposits Fair Value Disclosure DepositsFairValueDisclosure	722018000	USD
CY2019Q4	cass	Accounts And Drafts Payable AccountsAndDraftsPayable	684295000	USD
CY2019Q4	cass	Accounts And Drafts Payable Fair Value Disclosure AccountsAndDraftsPayableFairValueDisclosure	684295000	USD
CY2018Q4	cass	Accounts And Drafts Payable AccountsAndDraftsPayable	694360000	USD
CY2018Q4	cass	Accounts And Drafts Payable Fair Value Disclosure AccountsAndDraftsPayableFairValueDisclosure	694360000	USD
CY2019Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	103000	USD
CY2019Q4	us-gaap	Accrued Liabilities Fair Value Disclosure AccruedLiabilitiesFairValueDisclosure	103000	USD
CY2018Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	91000	USD
CY2018Q4	us-gaap	Accrued Liabilities Fair Value Disclosure AccruedLiabilitiesFairValueDisclosure	91000	USD
CY2019Q4	cass	Liabilities Carrying Value LiabilitiesCarryingValue	1441534000	USD
CY2019Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1442188000	USD
CY2018Q4	cass	Liabilities Carrying Value LiabilitiesCarryingValue	1416377000	USD
CY2018Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1416469000	USD
CY2019Q4	us-gaap	Assets Assets	1764243000	USD
CY2019	cass	Tax Equivalized Pretax Income TaxEquivalizedPretaxIncome	39550000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	14262000	USD
CY2018	cass	Fee Revenue And Other Income Revenue From Customers FeeRevenueAndOtherIncomeRevenueFromCustomers	104076000	USD
CY2018	us-gaap	Interest And Other Income InterestAndOtherIncome	50348000	USD
CY2018	us-gaap	Interest Expense InterestExpense	3736000	USD
CY2018	cass	Fee Revenue And Other Income Intersegment Income Expense FeeRevenueAndOtherIncomeIntersegmentIncomeExpense		USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4396000	USD
CY2018	cass	Tax Equivalized Pretax Income TaxEquivalizedPretaxIncome	38768000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	12569000	USD
CY2018Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	1554000	USD
CY2018Q4	us-gaap	Assets Assets	1695176000	USD
CY2018Q4	cass	Funding Sources FundingSources	1215386000	USD
CY2019	cass	Invoice Processing Fees Inscope Fasbasc606 InvoiceProcessingFeesInscopeFASBASC606	81329000	USD
CY2018	cass	Invoice Processing Fees Inscope Fasbasc606 InvoiceProcessingFeesInscopeFASBASC606	78461000	USD
CY2017	cass	Invoice Processing Fees Inscope Fasbasc606 InvoiceProcessingFeesInscopeFASBASC606	72961000	USD
CY2019	cass	Invoice Payment Fees Inscope Fasbasc606 InvoicePaymentFeesInscopeFASBASC606	26624000	USD
CY2018	cass	Invoice Payment Fees Inscope Fasbasc606 InvoicePaymentFeesInscopeFASBASC606	23720000	USD
CY2017	cass	Invoice Payment Fees Inscope Fasbasc606 InvoicePaymentFeesInscopeFASBASC606	20361000	USD
CY2019	cass	Information Services Payment And Processing Revenue InformationServicesPaymentAndProcessingRevenue	107953000	USD
CY2018	cass	Information Services Payment And Processing Revenue InformationServicesPaymentAndProcessingRevenue	102181000	USD
CY2017	cass	Information Services Payment And Processing Revenue InformationServicesPaymentAndProcessingRevenue	93322000	USD
CY2019	cass	Bank Service Fees BankServiceFees	1386000	USD
CY2018	cass	Bank Service Fees BankServiceFees	1335000	USD
CY2017	cass	Bank Service Fees BankServiceFees	1349000	USD
CY2019	cass	Fee Revenue Inscope Fasbasc606 FeeRevenueInscopeFASBASC606	109339000	USD
CY2018	cass	Fee Revenue Inscope Fasbasc606 FeeRevenueInscopeFASBASC606	103516000	USD
CY2017	cass	Fee Revenue Inscope Fasbasc606 FeeRevenueInscopeFASBASC606	94671000	USD
CY2019	cass	Other Income Outofscope Fasbasc606 OtherIncomeOutofscopeFASBASC606	730000	USD
CY2018	cass	Other Income Outofscope Fasbasc606 OtherIncomeOutofscopeFASBASC606	560000	USD
CY2017	cass	Other Income Outofscope Fasbasc606 OtherIncomeOutofscopeFASBASC606	841000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	110069000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	104076000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	95512000	USD
CY2019	cass	Net Interest Income After Provision For Loan Losses Outofscope Fasbasc606 NetInterestIncomeAfterProvisionForLoanLossesOutofscopeFASBASC606	47166000	USD
CY2018	cass	Net Interest Income After Provision For Loan Losses Outofscope Fasbasc606 NetInterestIncomeAfterProvisionForLoanLossesOutofscopeFASBASC606	44190000	USD
CY2017	cass	Net Interest Income After Provision For Loan Losses Outofscope Fasbasc606 NetInterestIncomeAfterProvisionForLoanLossesOutofscopeFASBASC606	39790000	USD
CY2019	us-gaap	Revenues Revenues	157235000	USD
CY2018	us-gaap	Revenues Revenues	148266000	USD
CY2017	us-gaap	Revenues Revenues	135302000	USD
CY2019	cass	Fee Revenue And Other Income Revenue From Customers FeeRevenueAndOtherIncomeRevenueFromCustomers	110069000	USD
CY2019	us-gaap	Interest And Other Income InterestAndOtherIncome	54694000	USD
CY2019	us-gaap	Interest Expense InterestExpense	5193000	USD
CY2019	cass	Fee Revenue And Other Income Intersegment Income Expense FeeRevenueAndOtherIncomeIntersegmentIncomeExpense		USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4790000	USD
CY2019Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	4281000	USD
CY2019Q4	cass	Funding Sources FundingSources	1268973000	USD
CY2017	cass	Fee Revenue And Other Income Revenue From Customers FeeRevenueAndOtherIncomeRevenueFromCustomers	95512000	USD
CY2017	us-gaap	Interest And Other Income InterestAndOtherIncome	47667000	USD
CY2017	us-gaap	Interest Expense InterestExpense	2187000	USD
CY2017	cass	Fee Revenue And Other Income Intersegment Income Expense FeeRevenueAndOtherIncomeIntersegmentIncomeExpense		USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4051000	USD
CY2017	cass	Tax Equivalized Pretax Income TaxEquivalizedPretaxIncome	40589000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	12569000	USD
CY2017Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	1996000	USD
CY2017Q4	us-gaap	Assets Assets	1603209000	USD
CY2017Q4	cass	Funding Sources FundingSources	1203479000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2019	cass	Tax Equivalent Adjustment TaxEquivalentAdjustment	2084000	USD
CY2018	cass	Tax Equivalent Adjustment TaxEquivalentAdjustment	2422000	USD
CY2017	cass	Tax Equivalent Adjustment TaxEquivalentAdjustment	5691000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	6682000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5848000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1675000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	145000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1531000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.055	pure
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	1748000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	1613000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1538000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	614000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	392000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1972000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	7877000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1195000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	6682000	USD
CY2019Q4	cass	Additional Operating Lease Liability AdditionalOperatingLeaseLiability	800000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	27013000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	27372000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	28262000	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	27422000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	110069000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	12897000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	13327000	USD
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	7684000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	8186000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	6371000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	30404000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.11
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	13666000	USD
CY2019Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	12719000	USD
CY2019	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	52609000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	1290000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	1305000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	1392000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	1206000	USD
CY2019	us-gaap	Interest Expense InterestExpense	5193000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	11607000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12022000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12274000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	11513000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	47416000	USD
CY2019Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	250000	USD
CY2019Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2019Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2019Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	250000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	28462000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	29971000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	30563000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	30773000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	119769000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1745000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1739000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1787000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1791000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7062000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	8163000	USD
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.07
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	25374000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	25640000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	26435000	USD
CY2018Q4	us-gaap	Noninterest Income NoninterestIncome	26627000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	104076000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	11288000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	11513000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	12215000	USD
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	12910000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	47926000	USD
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.03
CY2018Q1	us-gaap	Interest Expense InterestExpense	679000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	794000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	1029000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	1234000	USD
CY2018	us-gaap	Interest Expense InterestExpense	3736000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	10609000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	10719000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	11186000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	11676000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	44190000	USD
CY2018Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018Q4	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed		USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	26182000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	27463000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	28530000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	29744000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	111919000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1709000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1387000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1481000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1502000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6079000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	8092000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	7509000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	7610000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	7057000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	30268000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.06
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47

Files In Submission

Name	View Source	Status
0001206774-20-000650-index-headers.html	Edgar Link	pending
0001206774-20-000650-index.html	Edgar Link	pending
0001206774-20-000650.txt	Edgar Link	pending
0001206774-20-000650-xbrl.zip	Edgar Link	pending
cass-20191231.xsd	Edgar Link	pending
cass-20191231_cal.xml	Edgar Link	unprocessable
cass-20191231_def.xml	Edgar Link	unprocessable
cass-20191231_lab.xml	Edgar Link	unprocessable
cass-20191231_pre.xml	Edgar Link	unprocessable
cass3419464-10k3x5x1.jpg	Edgar Link	pending
cass3589044-10k.htm	Edgar Link	pending
cass3589044-10k_htm.xml	Edgar Link	completed
cass3589044-ex21.htm	Edgar Link	pending
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cass_logo.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
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$CASS
CASS INFORMATION SYSTEMS INC Stock $cass

2018 Q4 Form 10-K Financial Statement

#000120677420000650 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CASS CASS INFORMATION SYSTEMS INC Stock $cass

2018 Q4 Form 10-K Financial Statement

#000120677420000650 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CASS
CASS INFORMATION SYSTEMS INC Stock $cass