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Fair Value - Fair Value Measurement (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assumed Gain From Loan Sale $ 8,860    
Interest Rate Movement Effect (67,668)    
Servicing Rights Value 38,706    
Security Price Change 22,989    
Total Fair Value Measurement 2,887   $ (7,435)
Mortgage Banking | Level 2 | Fair Value, Recurring | Rate Lock Commitments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value disclosure, off-balance sheet risks, face amount, liability 2,491,104    
Assumed Gain From Loan Sale 7,448    
Interest Rate Movement Effect (54,885)    
Servicing Rights Value 33,680    
Total Fair Value Measurement (13,757)    
Mortgage Banking | Level 2 | Fair Value, Recurring | Forward Sales Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value disclosure, off-balance sheet risks, face amount, liability 2,622,053    
Security Price Change 22,989    
Total Fair Value Measurement 22,989    
Mortgage Banking | Level 2 | Fair Value, Recurring | Mortgages Held for Sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assumed Gain From Loan Sale 1,412    
Interest Rate Movement Effect (12,783)    
Servicing Rights Value 5,026    
Fair value, option, changes in fair value, gain (loss) (6,345) $ (2,675)  
Fair Value, principal amount, loans held for sale $ 332,137 $ 319,481