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INTEREST RATE SWAPS - Non-hedge (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Information about derivatives and swaps    
Interest-bearing $ 3,841,610,000 $ 3,376,165,000
Cash and Cash Equivalents, at Carrying Value 530,865,000 316,567,000
Interest rate swap | Non-Hedge    
Information about derivatives and swaps    
Interest rate swaps with Bank clients - Total, Notional Amount 478,828,000 432,524,000
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 156,162,000 120,442,000
Interest rate swaps with Bank clients - Liabilities, Notional Amount 83,252,000 95,820,000
Interest rate swaps with Bank clients - Total, Notional Amount 239,414,000 216,262,000
Interest rate swaps with Bank clients - Assets 5,803,000 4,066,000
Interest rate swaps with Bank clients - Liabilities (3,270,000) (4,867,000)
Interest rate swaps with Bank clients - Total, Fair Value 2,533,000 (801,000)
Interest rate swap | Non-Hedge | Counterparty    
Information about derivatives and swaps    
Interest rate swaps with Bank clients - Assets, Notional Amount 83,252,000 95,820,000
Interest rate swaps with Bank clients - Liabilities, Notional Amount 156,162,000 120,442,000
Interest rate swaps with Bank clients - Total, Notional Amount 239,414,000 216,262,000
Offsetting interest rate swaps with institutional swap dealer - Assets, Fair Value 3,270,000 4,867,000
Offsetting interest rate swaps with institutional swap dealer - Liabilities, Fair Value (5,803,000) (4,066,000)
Offsetting interest rate swaps with institutional swap dealer - Total, Fair Value (2,533,000) 801,000
Interest rate swap | Non-Hedge | Counterparty | Asset Pledged as Collateral    
Information about derivatives and swaps    
Interest-bearing 0 1,900,000
Cash and Cash Equivalents, at Carrying Value $ 6,800,000 $ 1,000,000.0