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INTEREST RATE SWAPS - NON-HEDGE (Details)
 6 Months Ended
Jun. 30, 2024
USD ($)
DerivativeInstrument
Dec. 31, 2023
USD ($)
Information about derivatives and swaps    
Interest-bearing $ 3,789,657,000 $ 3,376,165,000
Cash and Cash Equivalents, at Carrying Value $ 400,059,000 316,567,000
Interest rate swap | Non-Hedge    
Information about derivatives and swaps    
Number of interest rate swap agreements | DerivativeInstrument 3  
Interest rate swaps with Bank clients - Total, Notional Amount $ 475,878,000 432,524,000
Net loss position in which pledged securities as collateral are required 250,000  
Interest rate swap | Non-Hedge | Bank Clients    
Information about derivatives and swaps    
Interest rate swaps with Bank clients - Assets, Notional Amount 105,370,000 120,442,000
Interest rate swaps with Bank clients - Liabilities, Notional Amount 132,569,000 95,820,000
Interest rate swaps with Bank clients - Total, Notional Amount 237,939,000 216,262,000
Interest rate swaps with Bank clients - Assets 988,000 4,066,000
Interest rate swaps with Bank clients - Liabilities (6,396,000) (4,867,000)
Interest rate swaps with Bank clients - Total, Fair Value (5,408,000) (801,000)
Interest rate swap | Non-Hedge | Counterparty    
Information about derivatives and swaps    
Interest rate swaps with Bank clients - Assets, Notional Amount 132,569,000 95,820,000
Interest rate swaps with Bank clients - Liabilities, Notional Amount 105,370,000 120,442,000
Interest rate swaps with Bank clients - Total, Notional Amount 237,939,000 216,262,000
Offsetting interest rate swaps with institutional swap dealer - Assets, Fair Value 6,396,000 4,867,000
Offsetting interest rate swaps with institutional swap dealer - Liabilities, Fair Value (988,000) (4,066,000)
Offsetting interest rate swaps with institutional swap dealer - Total, Fair Value 5,408,000 801,000
Interest rate swap | Non-Hedge | Counterparty | Asset Pledged as Collateral    
Information about derivatives and swaps    
Interest-bearing 5,000,000.0 1,900,000
Cash and Cash Equivalents, at Carrying Value 340,000 $ 1,000,000.0
FHLB Advances | Non-Hedge    
Information about derivatives and swaps    
Interest rate swap on FHLB advances - Liabilities - Notional Amount 100,000,000  
Interest rate swap on FHLB advances - Liabilities - Fair Value $ (537,000)