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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Mar. 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 81.80%   81.80%     81.30%    
Loans and Leases Receivable, Related Parties $ 248   $ 248     $ 266   $ 292
Loans held for investment $ 20,903,944   $ 20,903,944     $ 21,057,616    
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate 0.50%   0.50%     0.37%    
Loans and leases receivable, nonaccrual loans $ 102,000   $ 102,000     $ 73,600    
Financing Receivable, Allowance for Credit Losses on Loans $ 346,100   $ 346,100     $ 351,800    
Allowance for Credit Losses as Percentage of Loans 1.56%   1.56%     1.59%    
Provision for credit losses $ 0 $ 7,923   $ 7,923        
Provision for credit losses 0 9,066 $ 0 9,066        
Decrease in allowance for credit losses for loans     $ (5,700)          
Increase in allowance for credit losses for loans, percentage     1.60%          
Net charge-offs 3,017 4,368 $ 5,721 6,511        
General reserve     10,400          
Allowance for credit losses on off-balance sheet credit exposures 37,646 37,646 37,646 $ 37,646 $ 37,646 $ 37,646 $ 36,503 $ 36,503
Commitments expected to fund 1,560,000   1,560,000          
Nonaccrual loans 102,031   102,031     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 2,100              
Nonperforming Financial Instruments [Member]                
Accounts Notes And Loans Receivable [Line Items]                
Loans held for investment $ 110,500   $ 110,500     $ 81,500