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Fair Value - Fair Value Measurement (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assumed Gain From Loan Sale $ 5,486    
Interest Rate Movement Effect 15,121    
Servicing Rights Value 25,934    
Security Price Change (1,994)    
Total Fair Value Measurement 44,547 $ 17,616  
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 1,714,602    
Assumed Gain From Loan Sale 4,693    
Interest Rate Movement Effect 11,660    
Servicing Rights Value 21,289    
Total Fair Value Measurement 37,642    
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 1,728,830    
Security Price Change (1,994)    
Total Fair Value Measurement (1,994)    
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 793    
Interest Rate Movement Effect 3,461    
Servicing Rights Value 4,645    
Total Fair Value Measurement 8,899    
Fair Value, principal amount, loans held for sale $ 332,680   $ 352,489