v3.26.1
Fair Value Measurement - Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value $ 1,569,836 $ 1,456,219
Derivative assets [1] 3,604 7,712
Derivative liabilities [1] 17,263 13,212
State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 178,188 176,636
Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value 24,021 18,021
Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [2] 1,365,371 1,259,268
Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities AFS, at estimated fair value [2] 2,256 2,294
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,903,972 4,772,891
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,835,610 4,700,476
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 4,835,610 4,700,476
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 5,370 5,426
Total asset fair value measurements 1,601,923 1,485,797
Total liability fair value measurements 19,796 24,114
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 178,188 176,636
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 24,021 18,021
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] 1,365,371 1,259,268
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] 2,256 2,294
Fair Value, Recurring | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 26,717 24,152
Derivative liabilities 19,796 24,114
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 5,370 5,426
Total asset fair value measurements 5,370 5,426
Total liability fair value measurements 0 0
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 1,596,553 1,480,371
Total liability fair value measurements 19,796 24,114
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 178,188 176,636
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 24,021 18,021
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] 1,365,371 1,259,268
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] 2,256 2,294
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 26,717 24,152
Derivative liabilities 19,796 24,114
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) | 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 121 248
Total asset fair value measurements 11,204 37,448
Fair Value, Nonrecurring | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 11,083 37,200
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 121 248
Total asset fair value measurements 11,204 37,448
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] $ 11,083 $ 37,200
[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 June 30, 2026, we had $1.7 million credit exposure related to interest rate swaps with financial institutions and $1.9 million related to interest rate swaps with customers. At December 31, 2025, we had $612,000 credit exposure related to interest rate swaps with financial institutions and $7.1 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.