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Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value $ 1,457,939 $ 1,533,894
Derivative assets [1] 3,138 1,321
Derivative liabilities [1] 17,324 21,534
US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 133,341 173,956
State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 401,007 414,332
Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 14,384 14,508
Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [2] 904,392 926,386
Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [2] 4,815 4,712
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,522,616 4,616,713
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,417,216 4,499,646
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 0 0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 0 0
Estimated Fair Value | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,417,216 4,499,646
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 5,336 5,257
Total asset fair value measurements 1,500,745 1,592,962
Total liability fair value measurements 23,173 24,150
Fair Value, Recurring | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 133,341 173,956
Fair Value, Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 401,007 414,332
Fair Value, Recurring | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 14,384 14,508
Fair Value, Recurring | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 904,392 926,386
Fair Value, Recurring | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 4,815 4,712
Fair Value, Recurring | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 37,470 53,811
Derivative liabilities 23,173 24,150
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 5,336 5,257
Total asset fair value measurements 138,677 179,213
Total liability fair value measurements 0 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 133,341 173,956
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 0 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 0 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 0 0
Total asset fair value measurements 1,362,068 1,413,749
Total liability fair value measurements 23,173 24,150
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 401,007 414,332
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 14,384 14,508
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 904,392 926,386
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 4,815 4,712
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 37,470 53,811
Derivative liabilities 23,173 24,150
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 0 0
Total asset fair value measurements 0 0
Total liability fair value measurements 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [3] 0 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 434 402
Total asset fair value measurements 35,083 7,128
Fair Value, Nonrecurring | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 34,649 6,726
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 0 0
Total asset fair value measurements 0 0
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 0 0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 0 0
Total asset fair value measurements 0 0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 0 0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 434 402
Total asset fair value measurements 35,083 7,128
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] $ 34,649 $ 6,726
[1] Net derivative assets are included in other assets and net derivative liabilities are included in other liabilities on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. At March 31, 2025, we had no credit exposure related to interest rate swaps with financial institutions and $3.1 million related to interest rate swaps with customers. At December 31, 2024, we had no credit exposure related to interest rate swaps with financial institutions and $1.3 million related to interest rate swaps with customers. The credit risk associated with customer transactions is partially mitigated as these are generally secured by the non-cash collateral securing the underlying transaction being hedged.
[2] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
[3] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
[4] Consists of individually evaluated loans. Loans for which the fair value of the collateral and commercial real estate fair value of the properties is less than cost basis are presented net of allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.