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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Derivative Instruments (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Asset Derivative    
Gross derivatives $ 56,639,000 $ 82,306,000
Offsetting derivative assets/liabilities (7,435,000) (171,000)
Cash collateral received/posted $ (46,760,000) (82,135,000)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities  
Net derivatives included in the consolidated balance sheets [1] $ 2,444,000 0
Liability Derivative    
Gross derivatives 25,684,000 21,217,000
Offsetting derivative assets/liabilities (7,435,000) (171,000)
Cash collateral received/posted 0 0
Net derivatives included in the consolidated balance sheets [1] 18,249,000 $ 21,046,000
Cash Flow Hedging | Interest Rate Swaps    
Liability Derivative    
Derivative, Notional Amount $ 1,010,000,000.00  
Derivatives designated as hedging instruments    
Asset Derivative    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Securities AFS, at estimated fair value (amortized cost of $1,332,467 and $1,387,874, respectively) Securities AFS, at estimated fair value (amortized cost of $1,332,467 and $1,387,874, respectively)
Financial institution counterparties    
Derivatives, Fair Value [Line Items]    
Credit exposure related to interest rate swaps $ 1,900,000 $ 0
Financial institution counterparties | Derivatives designated as hedging instruments | Cash Flow Hedging | Interest Rate Swaps    
Asset Derivative    
Gross derivatives 24,223,000 39,527,000
Liability Derivative    
Gross derivatives 6,910,000 0
Derivative, Notional Amount [2] 1,010,000,000 575,000,000
Financial institution counterparties | Derivatives designated as hedging instruments | Fair Value Hedging | Interest Rate Swaps    
Asset Derivative    
Gross derivatives 13,658,000 21,733,000
Liability Derivative    
Gross derivatives 16,000 171,000
Derivative, Notional Amount [2] 453,440,000 742,675,000
Financial institution counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swaps    
Asset Derivative    
Gross derivatives 18,249,000 21,046,000
Liability Derivative    
Gross derivatives 509,000 0
Derivative, Notional Amount [2] 248,073,000 223,124,000
Customer counterparties    
Derivatives, Fair Value [Line Items]    
Credit exposure related to interest rate swaps 509,000 0
Customer counterparties | Derivatives designated as non-hedging instruments | Interest Rate Swaps    
Asset Derivative    
Gross derivatives 509,000 0
Liability Derivative    
Gross derivatives 18,249,000 21,046,000
Derivative, Notional Amount [2] $ 248,073,000 $ 223,124,000
[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] Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.