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Borrowings (Additional Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2027
Dec. 31, 2024
May 31, 2024
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]            
Weighted average interest rates       2.24% 2.24% 0.29%
Customer repurchase agreements       $ 394,515 $ 394,515 $ 271,642
Federal Home Loan Bank Advances [Member]            
Debt Instrument [Line Items]            
Subordinated Borrowing, Interest Rate           4.78%
Maturities of Subordinated Debt   $ 1,200,000 $ 695,000      
Other Loans Payable, Long-Term, Noncurrent       500,000 500,000  
Short term borrowings           $ 2,070,000
Loans pledged as collaterals       $ 4,320,000 4,320,000  
Short Term Advances           1,910,000
Other Short-Term Borrowings           $ 160,000
Weighted average interest rates           5.70%
FHLB May 2026 Member            
Debt Instrument [Line Items]            
Maturities of Subordinated Debt         $ 300,000  
Borrowed funds cost percentage       4.73% 4.73%  
FHLB May 2027 Member            
Debt Instrument [Line Items]            
Maturities of Subordinated Debt $ 200,000          
Borrowed funds cost percentage 4.27%          
Secured Debt [Member]            
Debt Instrument [Line Items]            
Investment securities with carrying value       $ 1,880,000 $ 1,880,000  
Unused lines of Credit [Member]            
Debt Instrument [Line Items]            
Investment securities with carrying value       1,350,000 1,350,000  
Repurchase Agreements [Member]            
Debt Instrument [Line Items]            
Investment securities with carrying value       469,000 469,000  
Other Purposes [Member]            
Debt Instrument [Line Items]            
Investment securities with carrying value       $ 58,000 $ 58,000  
Federal Reserves Bank Term Funding Program [Member]            
Debt Instrument [Line Items]            
Borrowed funds cost percentage       4.76% 4.76%  
Repaid borrowings       $ 1,300,000