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Fair Value - Fair Value Measurement (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assumed Gain From Loan Sale $ 4,069    
Interest Rate Movement Effect (105,305)    
Servicing Rights Value 34,827    
Security Price Change 38,388    
Total Fair Value Measurement (28,021)   $ 18,237
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 2,213,239    
Assumed Gain From Loan Sale 3,359    
Interest Rate Movement Effect (85,498)    
Servicing Rights Value 30,137    
Total Fair Value Measurement (52,002)    
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 2,446,322    
Security Price Change 38,388    
Total Fair Value Measurement 38,388    
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 710    
Interest Rate Movement Effect (19,807)    
Servicing Rights Value 4,690    
Fair value, option, changes in fair value, gain (loss) (14,407) $ 4,296  
Fair Value, principal amount, loans held for sale $ 330,501 $ 297,896