v3.25.2
COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Jan. 01, 2024
Dec. 31, 2023
Commitments and Contingencies Disclosure [Line Items]                
Reserves for unfunded commitments $ 17,100     $ 16,900        
Loans and Leases Receivable, Commitments, Fixed Rates 78,800 $ 69,300            
Loans and Leases Receivable, Commitments, Variable Rates $ 3,800,000 $ 3,700,000            
Loan Commitments, Fixed Interest Rate Range, Minimum 0.00% 0.00%            
Loan Commitments, Fixed Interest Rate Range, Maximum 21.00% 21.00%            
Loan Commitments, Fixed Rate, Maturities, Minimum 1 year 1 year            
Loan Commitments, Fixed Rate, Maturities, Maximum 31 years 31 years 7 months 6 days            
Letters of credit issued to guarantee performance of a client to a third party $ 23,700     25,100        
Derivative, Notional Amount 18,863,363     16,941,027        
Stockholders' Equity Attributable to Parent 2,558,155   $ 2,501,235 2,438,041 $ 2,326,439 $ 2,287,003   $ 2,267,974
Estimated Litigation Liability 0     0        
Retained earnings                
Commitments and Contingencies Disclosure [Line Items]                
Stockholders' Equity Attributable to Parent 1,351,674   $ 1,304,636 1,276,329 $ 1,204,844 $ 1,166,065   $ 1,136,718
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained earnings                
Commitments and Contingencies Disclosure [Line Items]                
Stockholders' Equity Attributable to Parent             $ 600  
Credit Default Swap                
Commitments and Contingencies Disclosure [Line Items]                
Derivative, Notional Amount 284,400     310,700        
Commitments to Extend Credit                
Commitments and Contingencies Disclosure [Line Items]                
Commitments outstanding to extend credit $ 3,900,000     $ 3,800,000