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FAIR VALUE MEASUREMENT - Fair Value Measurements, Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value $ 1,299,014 $ 2,764,325
Derivative assets: Interest rate swaps [1] 0 13,412
Derivative liabilities: Interest rate swaps [1] 21,046 2,194
US Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value   58,877
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 964,852 2,051,936
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 8,704 135,532
Residential MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [2] 315,027 426,350
Commercial MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value [2] 10,431 91,630
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 5,235 5,920
Total asset fair value measurements 1,386,555 2,788,476
Total liability fair value measurements 21,217 19,823
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   58,877
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 964,852 2,051,936
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 8,704 135,532
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] 315,027 426,350
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] 10,431 91,630
Fair Value, Recurring [Member] | Interest Rate Swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets: Interest rate swaps 82,306 18,231
Derivative liabilities: Interest rate swaps 21,217 19,823
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 5,235 5,920
Total asset fair value measurements 5,235 64,797
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   58,877
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]    
Derivative assets: Interest rate swaps 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 1,381,320 2,723,679
Total liability fair value measurements 21,217 19,823
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 964,852 2,051,936
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 8,704 135,532
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] 315,027 426,350
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] 10,431 91,630
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]    
Derivative assets: Interest rate swaps 82,306 18,231
Derivative liabilities: Interest rate swaps 21,217 19,823
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]    
Derivative assets: Interest rate swaps 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 167  
Total asset fair value measurements 7,982 8,458
Fair Value, Nonrecurring [Member] | Collateral-Dependent Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] 7,815 8,458
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  
Total asset fair value measurements 0 0
Fair Value, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-Dependent Loans [Member]    
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  
Total asset fair value measurements 0 0
Fair Value, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) | Collateral-Dependent Loans [Member]    
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 167  
Total asset fair value measurements 7,982 8,458
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) | Collateral-Dependent Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral-dependent loans [4] $ 7,815 $ 8,458
[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, 2022, we had no credit exposure related to interest rate swaps with financial institutions and none related to interest rate swaps with customers. At December 31, 2021, we had no credit exposure related to interest rate swaps with financial institutions and $13.4 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 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.