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Disclosures about Fair Value of Assets and Liabilities - Schedule of Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 865,168 $ 997,558
U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 265,850 267,179
State and municipal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 340,312 433,544
Federal agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 21,313 31,215
Federal agency mortgage-backed pools    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 165,889 190,656
Corporate notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 71,804 74,964
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 865,168 997,558
Recurring Basis | U.S. Treasury and federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 265,850 267,179
Recurring Basis | State and municipal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 340,312 433,544
Recurring Basis | Federal agency collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 21,313 31,215
Recurring Basis | Federal agency mortgage-backed pools    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 165,889 190,656
Recurring Basis | Corporate notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 71,804 74,964
Recurring Basis | Interest rate swap agreements asset and liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 50,519 44,595
Derivative liability (50,519) (42,619)
Recurring Basis | Commitments to originate mortgage loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 292 284
Recurring Basis | Mortgage loan contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability (24) (50)
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 and liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commitments to originate mortgage loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 292 0
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage loan contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability (24) 0
Recurring Basis | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 865,168 997,558
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 265,850 267,179
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 340,312 433,544
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 21,313 31,215
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 165,889 190,656
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 71,804 74,964
Recurring Basis | Significant Other Observable Inputs (Level 2) | Interest rate swap agreements asset and liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 50,519 44,595
Derivative liability (50,519) (42,619)
Recurring Basis | Significant Other Observable Inputs (Level 2) | Commitments to originate mortgage loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 284
Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage loan contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability 0 (50)
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 and liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Commitments to originate mortgage loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Recurring Basis | Significant Unobservable Inputs (Level 3) | Mortgage loan contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability $ 0 $ 0