v3.26.3
FAIR VALUE - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financial Assets    
Equity securities $ 132,263 $ 128,857
Derivative assets 319,113 170,828
Financial Liabilities    
Derivative liabilities 520,026 258,968
Carrying Value | Fair Value on Recurring Basis    
Financial Assets    
Equity securities 132,263 128,857
Loans held-for-sale 30,456 52,911
Derivative assets 319,113 170,828
Financial Liabilities    
Derivative liabilities 520,026 258,968
Carrying Value | Fair Value on Recurring Basis | U.S. Treasury    
Financial Assets    
Investment securities available-for-sale: 191,586 214,544
Carrying Value | Fair Value on Recurring Basis | U.S. government-sponsored entities and agencies    
Financial Assets    
Investment securities available-for-sale: 1,294,105 1,372,392
Carrying Value | Fair Value on Recurring Basis | Mortgage-backed securities - Agency    
Financial Assets    
Investment securities available-for-sale: 9,415,911 9,168,035
Carrying Value | Fair Value on Recurring Basis | States and political subdivisions    
Financial Assets    
Investment securities available-for-sale: 256,688 426,008
Carrying Value | Fair Value on Recurring Basis | Pooled trust preferred securities    
Financial Assets    
Investment securities available-for-sale: 12,987 11,734
Carrying Value | Fair Value on Recurring Basis | Other securities    
Financial Assets    
Investment securities available-for-sale: 145,357 191,737
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Equity securities 132,263 128,857
Loans held-for-sale 0 0
Derivative assets 0 0
Financial Liabilities    
Derivative liabilities 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury    
Financial Assets    
Investment securities available-for-sale: 191,586 214,544
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government-sponsored entities and agencies    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities - Agency    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled trust preferred securities    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2)    
Financial Assets    
Equity securities 0 0
Loans held-for-sale 30,456 52,911
Derivative assets 319,113 170,828
Financial Liabilities    
Derivative liabilities 520,026 258,968
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. government-sponsored entities and agencies    
Financial Assets    
Investment securities available-for-sale: 1,294,105 1,372,392
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - Agency    
Financial Assets    
Investment securities available-for-sale: 9,415,911 9,168,035
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions    
Financial Assets    
Investment securities available-for-sale: 256,688 426,008
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Pooled trust preferred securities    
Financial Assets    
Investment securities available-for-sale: 12,987 11,734
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Other Observable Inputs (Level 2) | Other securities    
Financial Assets    
Investment securities available-for-sale: 145,357 191,737
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3)    
Financial Assets    
Equity securities 0 0
Loans held-for-sale 0 0
Derivative assets 0 0
Financial Liabilities    
Derivative liabilities 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | U.S. Treasury    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | U.S. government-sponsored entities and agencies    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities - Agency    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities    
Financial Assets    
Investment securities available-for-sale: 0 0
Estimate of Fair Value Measurement | Fair Value on Recurring Basis | Significant Unobservable Inputs (Level 3) | Other securities    
Financial Assets    
Investment securities available-for-sale: $ 0 $ 0