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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2027
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Funds borrowed under repurchase agreement   $ 261,887 $ 271,642
Weighted average interest rates   0.72% 0.29%
Loans Pledged As Collaterals   $ 4,440,000  
Borrowing Rate   4.60%  
Higher cost borrowings   $ 500,000  
Collateral Pledged [Member]      
Debt Instrument [Line Items]      
Investment securities at carrying value   4,790,000  
Federal Home Loan Bank Advances and Other Borrowings [Member]      
Debt Instrument [Line Items]      
Weighted average interest rates     5.70%
Other Loans Payable Long Term   500,000  
Borrowing Rate     4.78%
Higher cost borrowings     $ 160,000
Short term borrowings     2,070,000
Short Term Advances     $ 1,910,000
FederalHomeLoanBankAdvancesMayTwoThousandTwentySixMember      
Debt Instrument [Line Items]      
Maturities of advances BTFP   $ 300,000  
DebtInstrumentInterestRateEffectivePercentage   4.73%  
FederalHomeLoanBankAdvancesMayTwoThousandTwentySevenMember      
Debt Instrument [Line Items]      
Maturities of advances BTFP $ 200,000    
DebtInstrumentInterestRateEffectivePercentage 4.27%