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Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 1,262,175 | $ 1,134,025
U.S. Treasury and federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 39,602 | 19,715
State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,005,051 | 837,843
Federal agency collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,088 | 147,453
Federal agency mortgage-backed pools |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 87,351 | 118,799
Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 11,083 | 10,215
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,262,175 | 1,134,025
Recurring Basis | U.S. Treasury and federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 39,602 | 19,715
Recurring Basis | State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,005,051 | 837,843
Recurring Basis | Federal agency collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,088 | 147,453
Recurring Basis | Federal agency mortgage-backed pools |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 87,351 | 118,799
Recurring Basis | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 11,083 | 10,215
Recurring Basis | Interest rate swap agreements asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 17,864 | 35,388
Recurring Basis | Forward sale commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 504 | 1,045
Recurring Basis | Interest rate swap agreements liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (23,053) | (46,631)
Recurring Basis | Commitments to originate loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (701) |
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency mortgage-backed pools |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap agreements asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward sale commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap agreements liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commitments to originate loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 |
Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,262,175 | 1,134,025
Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury and federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 39,602 | 19,715
Recurring Basis | Significant Other Observable Inputs (Level 2) | State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 1,005,051 | 837,843
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,088 | 147,453
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed pools |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 87,351 | 118,799
Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 11,083 | 10,215
Recurring Basis | Significant Other Observable Inputs (Level 2) | Interest rate swap agreements asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 17,864 | 35,388
Recurring Basis | Significant Other Observable Inputs (Level 2) | Forward sale commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 504 | 1,045
Recurring Basis | Significant Other Observable Inputs (Level 2) | Interest rate swap agreements liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (23,053) | (46,631)
Recurring Basis | Significant Other Observable Inputs (Level 2) | Commitments to originate loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (701) |
Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | U.S. Treasury and federal agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | State and municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Federal agency collateralized mortgage obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Federal agency mortgage-backed pools |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Corporate notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Interest rate swap agreements asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Forward sale commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Interest rate swap agreements liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 0 | $ 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Commitments to originate loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | $ 0 |

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