$SBSI
SOUTHSIDE BANCSHARES INC Stock $sbsi

$sbsi Overview Financials Valuation SEC Filings Company Website

2022 Q3 Form 10-Q Financial Statement

#000070543222000129 Filed on July 29, 2022

Income Statement

Concept	2022 Q3	2022 Q2	2022 Q1
Revenue	$66.88M	$57.10M	$53.87M
YoY Change	21.43%	8.58%	0.58%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.771M	$2.761M	$2.765M
YoY Change	-1.04%	-4.79%	-4.06%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$11.37M	$6.022M	$4.967M
YoY Change	65.43%	-13.22%	-31.6%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$30.83M	$28.70M	$28.14M
YoY Change	-10.08%	18.58%	-27.55%
Income Tax	$3.900M	$3.300M	$3.100M
% Of Pretax Income	12.65%	11.5%	11.02%
Net Earnings	$26.95M	$25.41M	$25.00M
YoY Change	-8.04%	19.18%	-26.68%
Net Earnings / Revenue	40.3%	44.49%	46.4%
Basic Earnings Per Share	$0.84	$0.79	$0.77
Diluted Earnings Per Share	$0.84	$0.79	$0.77
COMMON SHARES
Basic Shares Outstanding	32.10M shares	32.12M shares	32.36M shares
Diluted Shares Outstanding	32.22M shares	32.25M shares	32.54M shares

Balance Sheet

Concept	2022 Q3	2022 Q2	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$195.1M	$172.3M	$187.1M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$142.7M	$142.8M	$142.9M
YoY Change	-0.06%	-0.04%	-1.21%
Goodwill	$201.1M	$201.1M	$201.1M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$5.137M	$5.687M	$6.273M
YoY Change	-31.99%	-31.05%	-30.13%
Long-Term Investments	$11.05M	$11.28M	$11.50M
YoY Change	-6.34%	-4.39%	-2.54%
Other Assets	$45.99M	$34.46M	$19.10M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$7.454B	$7.606B	$7.119B
YoY Change	4.46%	5.9%	1.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$17.34M	$16.10M	$16.40M
YoY Change	1.98%	-5.32%	-5.2%
Deferred Revenue
YoY Change
Short-Term Debt	$74.72M	$58.48M	$30.20M
YoY Change	260.97%	145.71%	35.43%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$17.34M	$16.10M	$16.40M
YoY Change	1.98%	-5.32%	-5.2%
LONG-TERM LIABILITIES
Long-Term Debt	$158.9M	$158.9M	$158.8M
YoY Change	0.06%	-38.33%	-38.33%
Other Long-Term Liabilities	$87.80M	$238.7M	$55.20M
YoY Change	51.37%	149.72%	-26.5%
Total Long-Term Liabilities	$246.7M	$397.6M	$214.0M
YoY Change	13.79%	12.57%	-35.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$17.34M	$16.10M	$16.40M
Total Long-Term Liabilities	$246.7M	$397.6M	$214.0M
Total Liabilities	$6.746B	$6.874B	$6.335B
YoY Change	7.8%	9.32%	3.17%
SHAREHOLDERS EQUITY
Retained Earnings	$224.1M	$208.2M	$193.7M
YoY Change	36.83%	43.29%	43.74%
Common Stock	$831.3M	$830.0M	$829.3M
YoY Change	0.63%	0.62%	0.86%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$167.1M	$167.0M	$158.5M
YoY Change	7.14%	18.8%	14.85%
Treasury Stock Shares	5.865M shares	5.876M shares	5.683M shares
Shareholders Equity	$707.6M	$731.8M	$784.2M
YoY Change
Total Liabilities & Shareholders Equity	$7.454B	$7.606B	$7.119B
YoY Change	4.46%	5.9%	1.72%

Cashflow Statement

Concept	2022 Q3	2022 Q2	2022 Q1
OPERATING ACTIVITIES
Net Income	$26.95M	$25.41M	$25.00M
YoY Change	-8.04%	19.18%	-26.68%
Depreciation, Depletion And Amortization	$2.771M	$2.761M	$2.765M
YoY Change	-1.04%	-4.79%	-4.06%
Cash From Operating Activities	$80.33M	$42.63M	$85.38M
YoY Change	65.63%	139.51%	36.79%
INVESTING ACTIVITIES
Capital Expenditures	-$3.405M	-$2.165M	$2.806M
YoY Change	70.25%	3.1%	17.11%
Acquisitions
YoY Change
Other Investing Activities	-$53.91M	-$390.6M	-$99.50M
YoY Change	-25.43%	279.23%	208.05%
Cash From Investing Activities	-$57.32M	-$392.8M	-$102.3M
YoY Change	-22.86%	273.71%	194.61%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$2.228M
YoY Change			-84.23%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-177.0K	335.4M	$2.236M
YoY Change	-98.86%	209.96%	-107.85%
NET CHANGE
Cash From Operating Activities	80.33M	42.63M	$85.38M
Cash From Investing Activities	-57.32M	-392.8M	-$102.3M
Cash From Financing Activities	-177.0K	335.4M	$2.236M
Net Change In Cash	22.84M	-14.76M	-$14.65M
YoY Change	-155.3%	-170.64%	1765.73%
FREE CASH FLOW
Cash From Operating Activities	$80.33M	$42.63M	$85.38M
Capital Expenditures	-$3.405M	-$2.165M	$2.806M
Free Cash Flow	$83.74M	$44.80M	$82.57M
YoY Change	65.81%	125.12%	37.57%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000705432
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-12247
	dei	Entity Registrant Name EntityRegistrantName	SOUTHSIDE BANCSHARES, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	TX
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	75-1848732
	dei	Entity Address Address Line1 EntityAddressAddressLine1	1201 S. Beckham Avenue,
	dei	Entity Address City Or Town EntityAddressCityOrTown	Tyler,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75701
	dei	City Area Code CityAreaCode	903
	dei	Local Phone Number LocalPhoneNumber	531-7111
	dei	Security12b Title Security12bTitle	Common Stock, $1.25 par value
	dei	Trading Symbol TradingSymbol	SBSI
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2022Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	32103712	shares
CY2022Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	111099000	usd
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	91120000	usd
CY2022Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	12910000	usd
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	110633000	usd
CY2022Q2	us-gaap	Federal Funds Sold FederalFundsSold	48280000	usd
CY2021Q4	us-gaap	Federal Funds Sold FederalFundsSold	0	usd
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CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1816349000	usd
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CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	3609889000	usd
CY2022Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	142772000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	142509000	usd
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CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	15073000	usd
CY2022Q2	us-gaap	Goodwill Goodwill	201116000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	201116000	usd
CY2022Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	5687000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	6895000	usd
CY2022Q2	us-gaap	Interest Receivable InterestReceivable	41539000	usd
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CY2022Q2	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	153701000	usd
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	344038000	usd
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CY2021Q2	us-gaap	Interest Expense Other InterestExpenseOther	11000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	73000	usd
	us-gaap	Interest Expense Other InterestExpenseOther	22000	usd
	us-gaap	Interest Expense InterestExpense	10989000	usd
	us-gaap	Interest Expense InterestExpense	14201000	usd
CY2022Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	51078000	usd
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	45647000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	99984000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	91950000	usd
CY2022Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-633000	usd
CY2021Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1677000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-339000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-8472000	usd
CY2022Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	51711000	usd
CY2021Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	43970000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	100323000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	100422000	usd
CY2022Q2	sbsi	Fee And Commissions Depositor Account FeeAndCommissionsDepositorAccount	6496000	usd
CY2021Q2	sbsi	Fee And Commissions Depositor Account FeeAndCommissionsDepositorAccount	6609000	usd
	sbsi	Fee And Commissions Depositor Account FeeAndCommissionsDepositorAccount	13124000	usd
	sbsi	Fee And Commissions Depositor Account FeeAndCommissionsDepositorAccount	12734000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-2177000	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	15000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-3720000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2018000	usd
CY2022Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	208000	usd
CY2021Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	393000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	386000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	986000	usd
CY2022Q2	sbsi	Fees And Commissions Fiduciary And Trust Activity FeesAndCommissionsFiduciaryAndTrustActivity	1520000	usd
CY2021Q2	sbsi	Fees And Commissions Fiduciary And Trust Activity FeesAndCommissionsFiduciaryAndTrustActivity	1496000	usd
	sbsi	Fees And Commissions Fiduciary And Trust Activity FeesAndCommissionsFiduciaryAndTrustActivity	3014000	usd
	sbsi	Fees And Commissions Fiduciary And Trust Activity FeesAndCommissionsFiduciaryAndTrustActivity	2879000	usd
CY2022Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	720000	usd
CY2021Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	645000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1411000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1271000	usd
CY2022Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	1098000	usd
CY2021Q2	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	850000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	1907000	usd
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	1630000	usd
CY2022Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1232000	usd
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	925000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3700000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3038000	usd
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	9097000	usd
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	10933000	usd
	us-gaap	Noninterest Income NoninterestIncome	19822000	usd
	us-gaap	Noninterest Income NoninterestIncome	24556000	usd
CY2022Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	20329000	usd
CY2021Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	20004000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40298000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40048000	usd
CY2022Q2	us-gaap	Occupancy Net OccupancyNet	3654000	usd
CY2021Q2	us-gaap	Occupancy Net OccupancyNet	3606000	usd
	us-gaap	Occupancy Net OccupancyNet	7310000	usd
	us-gaap	Occupancy Net OccupancyNet	7166000	usd
CY2022Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	716000	usd
CY2021Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	475000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1453000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	912000	usd
CY2022Q2	sbsi	Atm Expense ATMExpense	356000	usd
CY2021Q2	sbsi	Atm Expense ATMExpense	272000	usd
	sbsi	Atm Expense ATMExpense	637000	usd
	sbsi	Atm Expense ATMExpense	510000	usd
CY2022Q2	us-gaap	Professional Fees ProfessionalFees	1147000	usd
CY2021Q2	us-gaap	Professional Fees ProfessionalFees	1040000	usd
	us-gaap	Professional Fees ProfessionalFees	2074000	usd
	us-gaap	Professional Fees ProfessionalFees	2031000	usd
CY2022Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1739000	usd
CY2021Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1406000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3370000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2718000	usd
CY2022Q2	us-gaap	Communication Communication	509000	usd
CY2021Q2	us-gaap	Communication Communication	612000	usd
	us-gaap	Noninterest Expense NoninterestExpense	63301000	usd
	us-gaap	Communication Communication	1012000	usd
	us-gaap	Communication Communication	1137000	usd
CY2022Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	477000	usd
CY2021Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	435000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	949000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	889000	usd
CY2022Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	586000	usd
CY2021Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	730000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1208000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1496000	usd
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2593000	usd
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2119000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4990000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	5026000	usd
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	32106000	usd
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	30699000	usd
	us-gaap	Noninterest Expense NoninterestExpense	61933000	usd
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28702000	usd
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	24204000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	56844000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	63045000	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3297000	usd
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2887000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6443000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7637000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	25405000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	21317000	usd
	us-gaap	Net Income Loss NetIncomeLoss	50401000	usd
	us-gaap	Net Income Loss NetIncomeLoss	55408000	usd
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69
CY2022Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.34
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.33
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.68
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.65
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	25405000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	21317000	usd
	us-gaap	Net Income Loss NetIncomeLoss	50401000	usd
	us-gaap	Net Income Loss NetIncomeLoss	55408000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	-33523000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	33166000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	-195424000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	-15813000	usd
CY2022Q2	sbsi	Oci Debt Securities Available For Sale Transfer To Held To Maturity Gain Loss Before Adjustment And Tax OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityGainLossBeforeAdjustmentAndTax	-52360000	usd
CY2021Q2	sbsi	Oci Debt Securities Available For Sale Transfer To Held To Maturity Gain Loss Before Adjustment And Tax OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityGainLossBeforeAdjustmentAndTax	0	usd
	sbsi	Oci Debt Securities Available For Sale Transfer To Held To Maturity Gain Loss Before Adjustment And Tax OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityGainLossBeforeAdjustmentAndTax	-91504000	usd
	sbsi	Oci Debt Securities Available For Sale Transfer To Held To Maturity Gain Loss Before Adjustment And Tax OCIDebtSecuritiesAvailableForSaleTransferToHeldToMaturityGainLossBeforeAdjustmentAndTax	0	usd
CY2022Q2	sbsi	Amortizationof Unrealized Gains Losseson Securities Transferred Between Availablefor Sale And Heldto Maturity Debt Securities Before Tax AmortizationofUnrealizedGainsLossesonSecuritiesTransferredBetweenAvailableforSaleAndHeldtoMaturityDebtSecuritiesBeforeTax	-1310000	usd
CY2021Q2	sbsi	Amortizationof Unrealized Gains Losseson Securities Transferred Between Availablefor Sale And Heldto Maturity Debt Securities Before Tax AmortizationofUnrealizedGainsLossesonSecuritiesTransferredBetweenAvailableforSaleAndHeldtoMaturityDebtSecuritiesBeforeTax	-390000	usd
	sbsi	Amortizationof Unrealized Gains Losseson Securities Transferred Between Availablefor Sale And Heldto Maturity Debt Securities Before Tax AmortizationofUnrealizedGainsLossesonSecuritiesTransferredBetweenAvailableforSaleAndHeldtoMaturityDebtSecuritiesBeforeTax	-1553000	usd
	sbsi	Amortizationof Unrealized Gains Losseson Securities Transferred Between Availablefor Sale And Heldto Maturity Debt Securities Before Tax AmortizationofUnrealizedGainsLossesonSecuritiesTransferredBetweenAvailableforSaleAndHeldtoMaturityDebtSecuritiesBeforeTax	-806000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-2177000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	15000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-3720000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	2018000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7047000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-3104000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	27593000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7919000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-344000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-1599000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-1666000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-3167000	usd
CY2022Q2	sbsi	Other Comprehensive Income Loss Defined Benefit Plan Gain Lossand Prior Service Cost Credit Reclassification Adjustmentfrom Aoc Ibefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossandPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax	241000	usd
CY2021Q2	sbsi	Other Comprehensive Income Loss Defined Benefit Plan Gain Lossand Prior Service Cost Credit Reclassification Adjustmentfrom Aoc Ibefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossandPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax	-9000	usd
	sbsi	Other Comprehensive Income Loss Defined Benefit Plan Gain Lossand Prior Service Cost Credit Reclassification Adjustmentfrom Aoc Ibefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossandPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax	447000	usd
	sbsi	Other Comprehensive Income Loss Defined Benefit Plan Gain Lossand Prior Service Cost Credit Reclassification Adjustmentfrom Aoc Ibefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossandPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax	632000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-74764000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	32027000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-251949000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-5307000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-15700000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	6726000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-52909000	usd
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1114000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-59064000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	25301000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-199040000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4193000	usd
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-33659000	usd
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	46618000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-148639000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	51215000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	912172000	usd
CY2022Q1	us-gaap	Net Income Loss NetIncomeLoss	24996000	usd
CY2022Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-139976000	usd
CY2022Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	7671	shares
CY2022Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	322000	usd
CY2022Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	82285	shares
CY2022Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3358000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	290000	usd
CY2022Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	819000	usd
CY2022Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	16551	shares
CY2022Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	269000	usd
CY2022Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.34
CY2022Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	11003000	usd
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	784241000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	25405000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-59064000	usd
CY2022Q2	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	7717	shares
CY2022Q2	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	313000	usd
CY2022Q2	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	223901	shares
CY2022Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	8842000	usd
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	847000	usd
CY2022Q2	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	30162	shares
CY2022Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-212000	usd
CY2022Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.34
CY2022Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10906000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	731782000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	875297000	usd
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	34091000	usd
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29494000	usd
CY2021Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	8918	shares
CY2021Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	332000	usd
CY2021Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	427396	shares
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	15213000	usd
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	674000	usd
CY2021Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	126260	shares
CY2021Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3386000	usd
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.32
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10476000	usd
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	858597000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	21317000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	25301000	usd
CY2021Q2	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	7780	shares
CY2021Q2	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	330000	usd
CY2021Q2	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	90884	shares
CY2021Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3497000	usd
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	686000	usd
CY2021Q2	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	99217	shares
CY2021Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2441000	usd
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.33
CY2021Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10775000	usd
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	894400000	usd
	us-gaap	Profit Loss ProfitLoss	50401000	usd
	us-gaap	Profit Loss ProfitLoss	55408000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	5561000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-9346000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	5780000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-12186000	usd
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	323000	usd
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	683000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-339000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-8472000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1666000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1360000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	643000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	643000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2022000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-3720000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2018000	usd
	sbsi	Available For Sale Securities Loss On Impairment AvailableForSaleSecuritiesLossOnImpairment	38000	usd
	sbsi	Available For Sale Securities Loss On Impairment AvailableForSaleSecuritiesLossOnImpairment	0	usd
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-433000	usd
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-302000	usd
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	15835000	usd
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	27286000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	14966000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	26101000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	12000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	2394000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-2112000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3472000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-8409000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-346000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-784000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	62242000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3414000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	128033000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	80219000	usd
CY2022Q2	sbsi	Securities Transferred Unrealized Loss Net Of Tax SecuritiesTransferredUnrealizedLossNetOfTax	72300000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	523339000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	392788000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	264792000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	46720000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	78779000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	181956000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	6097000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	14220000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	11041000	usd
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	16240000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	9833000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	18973000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	317731000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-15333000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4965000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4507000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7000	usd
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1850000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	34000	usd
	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	59000	usd
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	47000	usd
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	44000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-495071000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-139846000	usd
	us-gaap	Net Change Interest And Noninterest Bearing Deposits Domestic NetChangeInterestAndNoninterestBearingDepositsDomestic	526069000	usd
	us-gaap	Net Change Interest And Noninterest Bearing Deposits Domestic NetChangeInterestAndNoninterestBearingDepositsDomestic	223822000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	35259000	usd
	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	611000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1050000000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	7080064000	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1240337000	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	7191223000	usd
	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	usd
CY2022Q2	sbsi	Transferred Securities Unrealized Loss Before Tax TransferredSecuritiesUnrealizedLossBeforeTax	91500000	usd
	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	-95000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	409000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5979000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	352000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	152000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	12200000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	18710000	usd
	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	635000	usd
	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	662000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	21909000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	21251000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	337574000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	79707000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-29464000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	20080000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	201753000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	108408000	usd
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	172289000	usd
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	128488000	usd
	us-gaap	Interest Paid Net InterestPaidNet	11334000	usd
	us-gaap	Interest Paid Net InterestPaidNet	14984000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	5200000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	6250000	usd
	sbsi	Loans Transferred To Other Repossessed Assets And Real Estate Through Foreclosure LoansTransferredToOtherRepossessedAssetsAndRealEstateThroughForeclosure	197000	usd
	sbsi	Loans Transferred To Other Repossessed Assets And Real Estate Through Foreclosure LoansTransferredToOtherRepossessedAssetsAndRealEstateThroughForeclosure	531000	usd
	sbsi	Debt Securities Available For Sale Transfer To Held To Maturity DebtSecuritiesAvailableForSaleTransferToHeldToMaturity	1089978000	usd
	sbsi	Debt Securities Available For Sale Transfer To Held To Maturity DebtSecuritiesAvailableForSaleTransferToHeldToMaturity	0	usd
CY2022Q2	sbsi	Unsettled Trades To Purchase Securities Liability UnsettledTradesToPurchaseSecuritiesLiability	174038000	usd
CY2021Q2	sbsi	Unsettled Trades To Purchase Securities Liability UnsettledTradesToPurchaseSecuritiesLiability	41888000	usd
CY2022Q2	sbsi	Unsettled Trades To Sell Securities UnsettledTradesToSellSecurities	72001000	usd
CY2021Q2	sbsi	Unsettled Trades To Sell Securities UnsettledTradesToSellSecurities	0	usd
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	Certain prior period amounts may be reclassified to conform to current year presentation.
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	25405000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	21317000	usd
	us-gaap	Net Income Loss NetIncomeLoss	50401000	usd
	us-gaap	Net Income Loss NetIncomeLoss	55408000	usd
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	32119000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	32632000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	32237000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	32730000	shares
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	132000	shares
CY2021Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	167000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	157000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	130000	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	32251000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	32799000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	32394000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	32860000	shares
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2021	sbsi	Securities Transferred From Available For Sale To Held To Maturity SecuritiesTransferredFromAvailableForSaleToHeldToMaturity	0	usd
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.79
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	18000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000	shares
CY2021Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	231000	shares
CY2022Q2	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-3217000	usd
CY2021Q2	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1554000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-5836000	usd
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-2045000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1816349000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4761000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	87756000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1733354000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1083672000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	237000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	114102000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	969807000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	2655594000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	113681000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	4950000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	2764325000	usd
CY2021Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	90780000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	4455000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	usd
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	95235000	usd
	sbsi	Securities Transferred From Available For Sale To Held To Maturity SecuritiesTransferredFromAvailableForSaleToHeldToMaturity	998500000	usd
CY2021Q4	sbsi	Transferred Securities Unrealized Loss Before Tax TransferredSecuritiesUnrealizedLossBeforeTax	1500000	usd
CY2021Q4	sbsi	Securities Transferred Unrealized Loss Net Of Tax SecuritiesTransferredUnrealizedLossNetOfTax	1200000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1345468000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	87142000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2926000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	614000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1348394000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	87756000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	922819000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	108717000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	33233000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	5385000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	956052000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	114102000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	2100000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	311552000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3891000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	17450000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1059000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	329002000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	4950000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	644
CY2022Q2	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0	usd
CY2021Q4	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0	usd
CY2022Q2	us-gaap	Interest Income Securities Us Treasury And Other Us Government InterestIncomeSecuritiesUSTreasuryAndOtherUSGovernment	59000	usd
CY2021Q2	us-gaap	Interest Income Securities Us Treasury And Other Us Government InterestIncomeSecuritiesUSTreasuryAndOtherUSGovernment	169000	usd
CY2022Q2	us-gaap	Interest Income Securities State And Municipal InterestIncomeSecuritiesStateAndMunicipal	13788000	usd
CY2021Q2	us-gaap	Interest Income Securities State And Municipal InterestIncomeSecuritiesStateAndMunicipal	10939000	usd
CY2022Q2	us-gaap	Interest Income Securities Corporate Debt Operating InterestIncomeSecuritiesCorporateDebtOperating	1390000	usd
CY2021Q2	us-gaap	Interest Income Securities Corporate Debt Operating InterestIncomeSecuritiesCorporateDebtOperating	986000	usd
CY2022Q2	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	3238000	usd
CY2021Q2	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	4647000	usd
CY2022Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	18475000	usd
CY2021Q2	us-gaap	Interest And Other Income InterestAndOtherIncome	16741000	usd
	us-gaap	Interest Income Securities Us Treasury And Other Us Government InterestIncomeSecuritiesUSTreasuryAndOtherUSGovernment	227000	usd
	us-gaap	Interest Income Securities Us Treasury And Other Us Government InterestIncomeSecuritiesUSTreasuryAndOtherUSGovernment	206000	usd
	us-gaap	Interest Income Securities State And Municipal InterestIncomeSecuritiesStateAndMunicipal	27120000	usd
	us-gaap	Interest Income Securities State And Municipal InterestIncomeSecuritiesStateAndMunicipal	21345000	usd
	us-gaap	Interest Income Securities Corporate Debt Operating InterestIncomeSecuritiesCorporateDebtOperating	2717000	usd
	us-gaap	Interest Income Securities Corporate Debt Operating InterestIncomeSecuritiesCorporateDebtOperating	1831000	usd
	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	7255000	usd
	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	10735000	usd
	us-gaap	Interest And Other Income InterestAndOtherIncome	37319000	usd
	us-gaap	Interest And Other Income InterestAndOtherIncome	34117000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-3700000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	4000000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2000000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	52000	usd
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0	usd
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	0	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	2039000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	2050000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	72424000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	72561000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	86994000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	86038000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	1193603000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	1114063000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1355060000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	1274712000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	461289000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	458642000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1816349000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1733354000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling Within One Year DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingWithinOneYear	120000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	120000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After One Through Five Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfterOneThroughFiveYears	1024000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	1024000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After5 Through10 Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfter5Through10Years	99549000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	97202000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date Rolling After10 Years DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDateRollingAfter10Years	870734000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	762618000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Allocated And Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityAllocatedAndSingleMaturityDate	971427000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	860964000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Amortized Cost Excluding Accrued Interest After Allowance For Credit Loss Maturity Without Single Maturity Date DebtSecuritiesHeldToMaturityAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLossMaturityWithoutSingleMaturityDate	112245000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	108843000	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	1083672000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	969807000	usd
CY2022Q2	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	11300000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	11800000	usd
CY2022Q2	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-191000	usd
CY2021Q2	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	17000	usd
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-466000	usd
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-90000	usd
CY2022Q2	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	usd
CY2021Q2	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	usd
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	0	usd
CY2022Q2	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-191000	usd
CY2021Q2	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	17000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-466000	usd
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-90000	usd
CY2022Q2	sbsi	Other Than Temporarily Impaired Equity Investments OtherThanTemporarilyImpairedEquityInvestments	0	usd
CY2022Q2	sbsi	Federal Home Loan Bank Stock With Other Than Temporary Impairment FederalHomeLoanBankStockWithOtherThanTemporaryImpairment	0	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3963041000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3645162000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35449000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35273000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	3927592000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	3609889000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	766596000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	1133377000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	462100000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	318197000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	159299000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	737912000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	385560000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3963041000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	1254660000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	564191000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	444235000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	220201000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	241060000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	595557000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	325258000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3645162000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3963041000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3645162000	usd
CY2022Q2	sbsi	Restructured Nonaccrual Loans RestructuredNonaccrualLoans	1100000	usd
CY2021Q4	sbsi	Restructured Nonaccrual Loans RestructuredNonaccrualLoans	1100000	usd
CY2022Q2	sbsi	Financing Receivable Nonaccrual Interest Income Reversal FinancingReceivableNonaccrualInterestIncomeReversal	24000	usd
	sbsi	Financing Receivable Nonaccrual Interest Income Reversal FinancingReceivableNonaccrualInterestIncomeReversal	35000	usd
CY2021Q2	sbsi	Financing Receivable Nonaccrual Interest Income Reversal FinancingReceivableNonaccrualInterestIncomeReversal	12000	usd
	sbsi	Financing Receivable Nonaccrual Interest Income Reversal FinancingReceivableNonaccrualInterestIncomeReversal	25000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	1300000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	1200000	usd
CY2022Q2	sbsi	Financing Receivable Collateral Dependent FinancingReceivableCollateralDependent	9000000	usd
CY2021Q4	sbsi	Financing Receivable Collateral Dependent FinancingReceivableCollateralDependent	8500000	usd
CY2022Q2	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	18000	usd
CY2021Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	21000	usd
CY2022Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	128000	usd
CY2022Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	3	contract
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	349000	usd
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	8	contract
CY2021Q2	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	106000	usd
CY2021Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	contract
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	250000	usd
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5	contract
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	139000	usd
CY2021Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	usd
CY2022Q2	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	usd
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35524000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	479000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	516000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	-37000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-112000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35449000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35273000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	1034000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1056000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	-22000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	154000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	35449000	usd
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	41454000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	527000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	466000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	61000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	1520000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	42913000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	49006000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	1322000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1088000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	234000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-5859000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	42913000	usd
CY2022Q2	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	14600000	usd
CY2021Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	13300000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In The Next Rolling Twelve Months BorrowedFundsMaturitiesRepaymentsOfPrincipalInTheNextRollingTwelveMonths	209173000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In Rolling Year Two BorrowedFundsMaturitiesRepaymentsOfPrincipalInRollingYearTwo	724000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In Rolling Year Three BorrowedFundsMaturitiesRepaymentsOfPrincipalInRollingYearThree	756000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In Rolling Year Four BorrowedFundsMaturitiesRepaymentsOfPrincipalInRollingYearFour	679000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In Rolling Year Five BorrowedFundsMaturitiesRepaymentsOfPrincipalInRollingYearFive	396000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal In Rolling After Year Five BorrowedFundsMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive	451000	usd
CY2022Q2	sbsi	Borrowed Funds Maturities Repayments Of Principal BorrowedFundsMaturitiesRepaymentsOfPrincipal	212179000	usd
CY2022Q2	sbsi	Line Of Credit Facility Number Of Credit Lines Maintained By Company LineOfCreditFacilityNumberOfCreditLinesMaintainedByCompany	3	credit_line
CY2021Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	usd
CY2022Q2	us-gaap	Federal Funds Purchased FederalFundsPurchased	0	usd
CY2022Q2	sbsi	Letters Of Credit Fhlb As Collateral LettersOfCreditFhlbAsCollateral	0	usd
CY2022Q2	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	29500000	usd
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	23200000	usd
	sbsi	Repurchase Agreement Counterparty Maturityof Agreements RepurchaseAgreementCounterpartyMaturityofAgreements	P1Y
CY2022Q2	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	1730000000	usd
CY2022Q2	us-gaap	Subordinated Debt SubordinatedDebt	98604000	usd
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	98534000	usd
CY2022Q2	us-gaap	Other Long Term Debt OtherLongTermDebt	60262000	usd
CY2021Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	60260000	usd
CY2022Q2	us-gaap	Long Term Debt LongTermDebt	158866000	usd
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	158794000	usd
	sbsi	Adjustment To Pension Liability AdjustmentToPensionLiability	447000	usd
	sbsi	Adjustment To Pension Liability AdjustmentToPensionLiability	632000	usd
CY2022Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	39100000	usd
CY2021Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	12800000	usd
CY2022Q2	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	40055000	usd
CY2022Q2	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	12354000	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	18231000	usd
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	19823000	usd
CY2022Q2	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	646000	usd
CY2022Q2	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	646000	usd
CY2021Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	4819000	usd
CY2021Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	4819000	usd
CY2022Q2	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	39130000	usd
CY2022Q2	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	usd
CY2021Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	usd
CY2021Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	12810000	usd
CY2022Q2	us-gaap	Derivative Assets DerivativeAssets	279000	usd
CY2022Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	11708000	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	13412000	usd
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	2194000	usd
CY2022Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2939000	usd
CY2021Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3026000	usd
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5800000	usd
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5615000	usd
CY2022Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	358000	usd
CY2021Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-139000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	643000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	643000	usd
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2022000	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3297000	usd
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2887000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6443000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7637000	usd
CY2022Q2	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	34500000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	17800000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	usd
CY2022Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3300000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6400000	usd
CY2022Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.115
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.113
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2900000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7600000	usd
CY2021Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.119
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.121
CY2022Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	2412000	usd
CY2021Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	3616000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	2384000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1100000	usd
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	6386000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-521000	usd
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	157000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-493000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-2613000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1891000	usd
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	3773000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1891000	usd
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	3773000	usd
CY2022Q2	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1207384000	usd
CY2021Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1065710000	usd
CY2022Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2021Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2021Q1	sbsi	Lessee Operating Lease Numberof Contracts LesseeOperatingLeaseNumberofContracts	1	contract
CY2022Q2	sbsi	Unsettled Trades To Purchase Securities Liability UnsettledTradesToPurchaseSecuritiesLiability	174000000	usd
CY2022Q2	sbsi	Unsettled Trades To Sell Securities UnsettledTradesToSellSecurities	72000000	usd
CY2021Q4	sbsi	Unsettled Trades To Purchase Securities Liability UnsettledTradesToPurchaseSecuritiesLiability	19000000	usd
CY2021Q4	sbsi	Unsettled Trades To Sell Securities UnsettledTradesToSellSecurities	0	usd
CY2022Q2	sbsi	Unsettled Issuancesof Brokered C Ds UnsettledIssuancesofBrokeredCDs	0	usd
CY2021Q4	sbsi	Unsettled Issuancesof Brokered C Ds UnsettledIssuancesofBrokeredCDs	0	usd

Files In Submission

Name	View Source	Status
0000705432-22-000129-index-headers.html	Edgar Link	pending
0000705432-22-000129-index.html	Edgar Link	pending
0000705432-22-000129.txt	Edgar Link	pending
0000705432-22-000129-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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R66.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
sbsi-20220630.htm	Edgar Link	pending
sbsi-20220630.xsd	Edgar Link	pending
sbsi-20220630_cal.xml	Edgar Link	unprocessable
sbsi-20220630_def.xml	Edgar Link	unprocessable
sbsi-20220630_htm.xml	Edgar Link	completed
sbsi-20220630_lab.xml	Edgar Link	unprocessable
sbsi-20220630_pre.xml	Edgar Link	unprocessable
sbsi_063022ex311.htm	Edgar Link	pending
sbsi_063022ex312.htm	Edgar Link	pending
sbsi_063022ex32.htm	Edgar Link	pending
Show.js	Edgar Link	pending

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$SBSI
SOUTHSIDE BANCSHARES INC Stock $sbsi

2022 Q3 Form 10-Q Financial Statement

#000070543222000129 Filed on July 29, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SBSI SOUTHSIDE BANCSHARES INC Stock $sbsi

2022 Q3 Form 10-Q Financial Statement

#000070543222000129 Filed on July 29, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SBSI
SOUTHSIDE BANCSHARES INC Stock $sbsi