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Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2027
May 31, 2026
Dec. 31, 2024
May 31, 2024
Dec. 31, 2023
Jun. 30, 2024
Subordinated Borrowing [Line Items]            
Customer repurchase agreements         $ 271,642 $ 268,826
Weighted average interest rates         0.29% 0.51%
Secured Debt [Member]            
Subordinated Borrowing [Line Items]            
Investment securities with carrying value           $ 2,180,000
Repurchase Agreements [Member]            
Subordinated Borrowing [Line Items]            
Investment securities with carrying value           363,300
Borrowings [Member]            
Subordinated Borrowing [Line Items]            
Investment securities with carrying value           1,350,000
Unused lines of Credit [Member]            
Subordinated Borrowing [Line Items]            
Investment securities with carrying value           427,400
Other Purposes [Member]            
Subordinated Borrowing [Line Items]            
Investment securities with carrying value           46,000
Federal Home Loan Bank Advances [Member]            
Subordinated Borrowing [Line Items]            
Subordinated Borrowing, Interest Rate         4.78%  
Other Short-Term Borrowings         $ 160,000 500,000
Weighted average interest rates         5.70%  
Borrowed funds cost percentage 4.27% 4.73%        
Short term borrowings         $ 2,070,000  
Short Term Advances         $ 1,910,000  
Loans pledged as collaterals           4,450,000
Maturities of Subordinated Debt $ 200,000 $ 300,000 $ 1,200,000 $ 695,000    
Federal Reserve's Bank Term Funding Program [Member]            
Subordinated Borrowing [Line Items]            
Borrowings           $ 1,800,000
Borrowed funds cost percentage           4.76%
Borrowings           $ 1,300,000