Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Estimated fair value | Securities held to maturity |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
$ 45,795us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_HeldtomaturitySecuritiesMember |
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Estimated fair value | Portfolio loans, net |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
2,482,700us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
2,232,134us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
Estimated fair value | State tax credits, held for sale |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
31,281us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
35,668us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
Estimated fair value | Deposits |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
2,494,624us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
2,540,822us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
Estimated fair value | Subordinated debentures |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
34,124us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
39,358us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
Estimated fair value | Federal Home Loan Bank advances |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
144,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
54,137us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Estimated fair value | Other Borrowings |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
239,950us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
214,377us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
Level 1 | Securities held to maturity |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_HeldtomaturitySecuritiesMember |
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Level 1 | Portfolio loans, net |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
Level 1 | State tax credits, held for sale |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
Level 1 | Deposits |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
1,986,158us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
1,902,038us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
Level 1 | Subordinated debentures |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
Level 1 | Federal Home Loan Bank advances |
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|
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Level 1 | Other Borrowings |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
Level 2 | Securities held to maturity |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial assets not on condensed consolidated balance sheets at fair value |
45,795us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_HeldtomaturitySecuritiesMember |
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Level 2 | Portfolio loans, net |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
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Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
Level 2 | State tax credits, held for sale |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
Level 2 | Deposits |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
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Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
Level 2 | Subordinated debentures |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
34,124us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
39,358us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
Level 2 | Federal Home Loan Bank advances |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
144,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
54,137us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Level 2 | Other Borrowings |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
239,950us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
214,377us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
Level 3 | Securities held to maturity |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
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Financial assets not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_HeldtomaturitySecuritiesMember |
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Level 3 | Portfolio loans, net |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial assets not on condensed consolidated balance sheets at fair value |
2,482,700us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
2,232,134us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = efsc_NoncoveredLoansMember |
Level 3 | State tax credits, held for sale |
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|
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial assets not on condensed consolidated balance sheets at fair value |
31,281us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
35,668us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = efsc_StateTaxCreditsHeldForSaleMember |
Level 3 | Deposits |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
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Financial liabilities not on condensed consolidated balance sheets at fair value |
508,466us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
638,784us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_DepositsMember |
Level 3 | Subordinated debentures |
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|
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_SubordinatedDebtMember |
Level 3 | Federal Home Loan Bank advances |
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|
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Level 3 | Other Borrowings |
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |
|
|
Financial liabilities not on condensed consolidated balance sheets at fair value |
$ 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |
$ 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancialInstrumentAxis = us-gaap_BorrowingsMember |