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FAIR VALUE MEASUREMENT - Fair Value Measurements, Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value $ 1,296,294 $ 1,299,014
Amortized cost of hedged assets - Securities AFS [1] 2,444 0
Derivative liabilities: Interest rate swaps [1] 18,249 21,046
US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 139,725  
State and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 568,745 964,852
Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 14,093 8,704
Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [2] 568,983 315,027
Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [2] 4,748 10,431
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,481,836 4,111,176
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 4,198,879 3,880,664
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 4,198,879 3,880,664
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 5,308 5,235
Total asset fair value measurements 1,358,241 1,386,555
Total liability fair value measurements 25,684 21,217
Fair Value, Recurring [Member] | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 139,725  
Fair Value, Recurring [Member] | State and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 568,745 964,852
Fair Value, Recurring [Member] | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 14,093 8,704
Fair Value, Recurring [Member] | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [3] 568,983 315,027
Fair Value, Recurring [Member] | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [3] 4,748 10,431
Fair Value, Recurring [Member] | Interest Rate Swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost of hedged assets - Securities AFS 56,639 82,306
Derivative liabilities: Interest rate swaps 25,684 21,217
Fair Value, Recurring [Member] | 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 5,308 5,235
Total asset fair value measurements 145,033 5,235
Total liability fair value measurements 0 0
Fair Value, Recurring [Member] | 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 available for sale, at estimated fair value 139,725  
Fair Value, Recurring [Member] | 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 available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | 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 available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | 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 available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | 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 available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost of hedged assets - Securities AFS 0 0
Derivative liabilities: Interest rate swaps 0 0
Fair Value, Recurring [Member] | 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 1,213,208 1,381,320
Total liability fair value measurements 25,684 21,217
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0  
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | State and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 568,745 964,852
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 14,093 8,704
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [3] 568,983 315,027
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [3] 4,748 10,431
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest Rate Swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost of hedged assets - Securities AFS 56,639 82,306
Derivative liabilities: Interest rate swaps 25,684 21,217
Fair Value, Recurring [Member] | 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 [Member] | Significant Unobservable Inputs (Level 3) | US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0  
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | State and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 0 0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest Rate Swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Amortized cost of hedged assets - Securities AFS 0 0
Derivative liabilities: Interest rate swaps 0 0
Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 99 167
Total asset fair value measurements 7,099 7,982
Fair Value, Nonrecurring [Member] | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 7,000 7,815
Fair Value, Nonrecurring [Member] | 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 [Member] | 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 0 0
Fair Value, Nonrecurring [Member] | 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 [Member] | Significant Other Observable Inputs (Level 2) | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans 0 0
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets 99 167
Total asset fair value measurements 7,099 7,982
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) | Collateral Pledged    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] $ 7,000 $ 7,815
[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 December 31, 2023, we had $1.9 million credit exposure related to interest rate swaps with financial institutions and $509,000 related to interest rate swaps with customers. At December 31, 2022, we had no credit exposure related to interest rate swaps with financial institutions and none 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 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.