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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]                
Percentage of Loans Related to Single Industry on Loans 10.00%     10.00%     10.00%  
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans 81.70%     81.70%     81.30%  
Loans and Leases Receivable, Related Parties $ 100     $ 100     $ 266 $ 292
Loans held for investment $ 20,738,294     $ 20,738,294     $ 21,057,616  
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate 0.54%     0.54%     0.37%  
Loans and leases receivable, nonaccrual loans $ 105,500     $ 105,500     $ 73,600  
Financing Receivable, Allowance for Credit Losses on Loans $ 339,600     $ 339,600     $ 351,800  
Allowance for Credit Losses as Percentage of Loans 1.54%     1.54%     1.59%  
Provision for credit losses $ 0     $ 0 $ 7,923      
Provision for credit losses 0 $ 9,100   0 9,066      
Decrease in allowance for credit losses for loans       $ (12,200)        
Increase in allowance for credit losses for loans, percentage       3.50%        
Net charge-offs 6,458 5,455   $ 12,179 11,966      
General reserve       15,000        
Allowance for credit losses on off-balance sheet credit exposures 37,646 $ 37,646 $ 37,646 37,646 $ 37,646 $ 37,646 $ 37,646 $ 36,503
Commitments expected to fund 1,420,000     1,420,000        
Nonaccrual loans 105,529     105,529     73,647  
LSSB Merger [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Provision for credit losses     7,900          
Troubled Debt Restructuring [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Allowance for credit losses on off-balance sheet credit exposures 37,600     37,600     37,600  
Troubled Debt Restructuring [Member] | LSSB Merger [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Provision for credit losses     $ 1,200          
PCD Loans [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Net charge-offs 4,500              
Nonperforming Financial Instruments [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Loans held for investment $ 119,600     $ 119,600     $ 81,500