3.19.1 html 632 281 1 true 92 0 false 10 false false R1.htm 100000 - Document - Document And Entity Information Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DocumentDocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 100010 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDBALANCESHEETS CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 100020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDBALANCESHEETSParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFINCOME CONSOLIDATED STATEMENTS OF INCOME Statements 4 false false R5.htm 100040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 100050 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 6 false false R7.htm 100060 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTOFCHANGESINSHAREHOLDERSEQUITY CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY Statements 7 false false R8.htm 100070 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTOFCHANGESINSHAREHOLDERSEQUITYParenthetical CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Statements 8 false false R9.htm 100080 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 9 false false R10.htm 100090 - Disclosure - The Business of Sierra Bancorp Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureTheBusinessOfSierraBancorp The Business of Sierra Bancorp Notes 10 false false R11.htm 100100 - Disclosure - Basis of Presentation Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureBasisOfPresentation Basis of Presentation Notes 11 false false R12.htm 100110 - Disclosure - Current Accounting Developments Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCurrentAccountingDevelopments Current Accounting Developments Notes 12 false false R13.htm 100120 - Disclosure - Supplemental Disclosure of Cash and Non-Cash Flow Information Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureSupplementalDisclosureOfCashAndNonCashFlowInformation Supplemental Disclosure of Cash and Non-Cash Flow Information Notes 13 false false R14.htm 100130 - Disclosure - Share Based Compensation Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureShareBasedCompensation Share Based Compensation Notes 14 false false R15.htm 100140 - Disclosure - Earnings per Share Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureEarningsPerShare Earnings per Share Notes 15 false false R16.htm 100150 - Disclosure - Comprehensive Income Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureComprehensiveIncome Comprehensive Income Notes 16 false false R17.htm 100160 - Disclosure - Financial Instruments with Off-Balance-Sheet Risk Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRisk Financial Instruments with Off-Balance-Sheet Risk Notes 17 false false R18.htm 100170 - Disclosure - Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurements Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements Notes 18 false false R19.htm 100180 - Disclosure - Investments Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestments Investments Notes 19 false false R20.htm 100190 - Disclosure - Credit Quality and Nonperforming Assets Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssets Credit Quality and Nonperforming Assets Notes 20 false false R21.htm 100200 - Disclosure - Allowance for Loan and Lease Losses Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLosses Allowance for Loan and Lease Losses Notes 21 false false R22.htm 100210 - Disclosure - Operating Leases Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeases Operating Leases Notes 22 false false R23.htm 100220 - Disclosure - Revenue Recognition Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognition Revenue Recognition Notes 23 false false R24.htm 100230 - Disclosure - Financial Instruments with Off-Balance-Sheet Risk (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables Financial Instruments with Off-Balance-Sheet Risk (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRisk 24 false false R25.htm 100240 - Disclosure - Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurementsTables Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurements 25 false false R26.htm 100250 - Disclosure - Investments (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsTables Investments (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestments 26 false false R27.htm 100260 - Disclosure - Credit Quality and Nonperforming Assets (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsTables Credit Quality and Nonperforming Assets (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssets 27 false false R28.htm 100270 - Disclosure - Allowance for Loan and Lease Losses (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLossesTables Allowance for Loan and Lease Losses (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLosses 28 false false R29.htm 100280 - Disclosure - Operating Leases (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesTables Operating Leases (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeases 29 false false R30.htm 100290 - Disclosure - Revenue Recognition (Tables) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognitionTables Revenue Recognition (Tables) Tables http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognition 30 false false R31.htm 100300 - Disclosure - The Business of Sierra Bancorp (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureTheBusinessOfSierraBancorpNarrativeDetails The Business of Sierra Bancorp (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureTheBusinessOfSierraBancorp 31 false false R32.htm 100310 - Disclosure - Current Accounting Developments (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCurrentAccountingDevelopmentsNarrativeDetails Current Accounting Developments (Narrative) (Details) Details 32 false false R33.htm 100320 - Disclosure - Supplemental Disclosure of Cash and Non-Cash Flow Information (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureSupplementalDisclosureOfCashAndNonCashFlowInformationNarrativeDetails Supplemental Disclosure of Cash and Non-Cash Flow Information (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureSupplementalDisclosureOfCashAndNonCashFlowInformation 33 false false R34.htm 100330 - Disclosure - Share Based Compensation (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureShareBasedCompensationNarrativeDetails Share Based Compensation (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureShareBasedCompensation 34 false false R35.htm 100340 - Disclosure - Earnings per Share (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureEarningsPerShareNarrativeDetails Earnings per Share (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureEarningsPerShare 35 false false R36.htm 100350 - Disclosure - Financial Instruments with Off-Balance-Sheet Risk (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskDetails Financial Instruments with Off-Balance-Sheet Risk (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables 36 false false R37.htm 100360 - Disclosure - Financial Instruments with Off-Balance-Sheet Risk (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskNarrativeDetails Financial Instruments with Off-Balance-Sheet Risk (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables 37 false false R38.htm 100370 - Disclosure - Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurementsCarryingAmountAndEstimatedFairValuesOfFinancialInstrumentsDetails Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) Details 38 false false R39.htm 100380 - Disclosure - Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurementsScheduleOfFairValueAssetsMeasuredOnRecurringBasisDetails Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis) (Details) Details 39 false false R40.htm 100390 - Disclosure - Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Schedule Of Fair Value Assets and Liabilities Measured on Non Recurring Basis) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureFairValueDisclosuresAndReportingFairValueOptionAndFairValueMeasurementsScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnNonRecurringBasisDetails Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements - Schedule Of Fair Value Assets and Liabilities Measured on Non Recurring Basis) (Details) Details 40 false false R41.htm 100400 - Disclosure - Investments - Amortized Cost and Estimated Fair Value of Available-For-Sale Investment Securities (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsAmortizedCostAndEstimatedFairValueOfAvailableForSaleInvestmentSecuritiesDetails Investments - Amortized Cost and Estimated Fair Value of Available-For-Sale Investment Securities (Details) Details 41 false false R42.htm 100410 - Disclosure - Investments (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsNarrativeDetails Investments (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsTables 42 false false R43.htm 100420 - Disclosure - Investments - Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsInformationPertainingToInvestmentSecuritiesAggregatedByInvestmentCategoryAndLengthOfTimeThatIndividualSecuritiesInContinuousLossPositionDetails Investments - Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position (Details) Details 43 false false R44.htm 100430 - Disclosure - Investments - Realized Gain (Loss) on Investments (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsRealizedGainLossOnInvestmentsDetails Investments - Realized Gain (Loss) on Investments (Details) Details 44 false false R45.htm 100440 - Disclosure - Investments - Investments Classified by Contractual Maturity Date (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsInvestmentsClassifiedByContractualMaturityDateDetails Investments - Investments Classified by Contractual Maturity Date (Details) Details 45 false false R46.htm 100450 - Disclosure - Investments - Summary of Amortized Cost and Fair Values of General Obligation and Revenue Bonds (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureInvestmentsSummaryOfAmortizedCostAndFairValuesOfGeneralObligationAndRevenueBondsDetails Investments - Summary of Amortized Cost and Fair Values of General Obligation and Revenue Bonds (Details) Details 46 false false R47.htm 100460 - Disclosure - Credit Quality and Nonperforming Assets - Credit Quality Classifications (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsCreditQualityClassificationsDetails Credit Quality and Nonperforming Assets - Credit Quality Classifications (Details) Details 47 false false R48.htm 100470 - Disclosure - Credit Quality and Nonperforming Assets (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsNarrativeDetails Credit Quality and Nonperforming Assets (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsTables 48 false false R49.htm 100480 - Disclosure - Credit Quality and Nonperforming Assets - Past Due and Nonaccrual Loans (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsPastDueAndNonaccrualLoansDetails Credit Quality and Nonperforming Assets - Past Due and Nonaccrual Loans (Details) Details 49 false false R50.htm 100490 - Disclosure - Credit Quality and Nonperforming Assets - Past Due and Nonaccrual Loans (Parenthetical) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsPastDueAndNonaccrualLoansParentheticalDetails Credit Quality and Nonperforming Assets - Past Due and Nonaccrual Loans (Parenthetical) (Details) Details 50 false false R51.htm 100500 - Disclosure - Credit Quality and Nonperforming Assets - Troubled Debt Restructurings, by Type of Loan Modification (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsTroubledDebtRestructuringsByTypeOfLoanModificationDetails Credit Quality and Nonperforming Assets - Troubled Debt Restructurings, by Type of Loan Modification (Details) Details 51 false false R52.htm 100510 - Disclosure - Credit Quality and Nonperforming Assets - Troubled Debt Restructurings (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsTroubledDebtRestructuringsDetails Credit Quality and Nonperforming Assets - Troubled Debt Restructurings (Details) Details 52 false false R53.htm 100520 - Disclosure - Credit Quality and Nonperforming Assets - Carrying Amount and Unpaid Principal Balance of Purchased Credit Impaired Loans (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureCreditQualityAndNonperformingAssetsCarryingAmountAndUnpaidPrincipalBalanceOfPurchasedCreditImpairedLoansDetails Credit Quality and Nonperforming Assets - Carrying Amount and Unpaid Principal Balance of Purchased Credit Impaired Loans (Details) Details 53 false false R54.htm 100530 - Disclosure - Allowance for Loan and Lease Losses (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLossesNarrativeDetails Allowance for Loan and Lease Losses (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLossesTables 54 false false R55.htm 100540 - Disclosure - Allowance for Loan and Lease Losses - Individually Impaired Loans (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLossesIndividuallyImpairedLoansDetails Allowance for Loan and Lease Losses - Individually Impaired Loans (Details) Details 55 false false R56.htm 100550 - Disclosure - Allowance for Loan and Lease Losses - Activity in Allowance for Loan and Lease Losses (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureAllowanceForLoanAndLeaseLossesActivityInAllowanceForLoanAndLeaseLossesDetails Allowance for Loan and Lease Losses - Activity in Allowance for Loan and Lease Losses (Details) Details 56 false false R57.htm 100560 - Disclosure - Operating Leases - (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesNarrativeDetails Operating Leases - (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesTables 57 false false R58.htm 100570 - Disclosure - Operating Leases - Schedule of Components of Operating Leases (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesScheduleOfComponentsOfOperatingLeasesDetails Operating Leases - Schedule of Components of Operating Leases (Details) Details 58 false false R59.htm 100580 - Disclosure - Operating Leases - Schedule of Cash Flow Information and Weighted Average Remaining Lease Terms and Discount Rate for Operating Leases (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesScheduleOfCashFlowInformationAndWeightedAverageRemainingLeaseTermsAndDiscountRateForOperatingLeasesDetails Operating Leases - Schedule of Cash Flow Information and Weighted Average Remaining Lease Terms and Discount Rate for Operating Leases (Details) Details 59 false false R60.htm 100590 - Disclosure - Operating Leases - Schedule of Maturities of Lease Liabilities for Operating Leases (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesScheduleOfMaturitiesOfLeaseLiabilitiesForOperatingLeasesDetails Operating Leases - Schedule of Maturities of Lease Liabilities for Operating Leases (Details) Details 60 false false R61.htm 100610 - Disclosure - Operating Leases - Schedule of Future Minimum Rental Payments (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureOperatingLeasesScheduleOfFutureMinimumRentalPaymentsDetails Operating Leases - Schedule of Future Minimum Rental Payments (Details) Details 61 false false R62.htm 100620 - Disclosure - Revenue Recognition (Narrative) (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognitionNarrativeDetails Revenue Recognition (Narrative) (Details) Details http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognitionTables 62 false false R63.htm 100630 - Disclosure - Revenue Recognition - Schedule of Sources of Non-interest Income (Details) Sheet http://www.bankofthesierra.com/20190331/taxonomy/role/DisclosureRevenueRecognitionScheduleOfSourcesOfNonInterestIncomeDetails Revenue Recognition - Schedule of Sources of Non-interest Income (Details) Details 63 false false All Reports Book All Reports bsrr-20190331.xml bsrr-20190331.xsd bsrr-20190331_cal.xml bsrr-20190331_def.xml bsrr-20190331_lab.xml bsrr-20190331_pre.xml http://fasb.org/srt/2018-01-31 http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/stpr/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 true true