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Fair Value - Fair Value Measurement (Detail) - Mortgage Banking - Level 2 - Fair Value, Recurring - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Rate Lock Commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Notional Amount $ 2,150,767 $ 1,707,835
Total fair value measurement gain/(loss) 30,435 37,279
Forward Sales Contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Notional Amount 1,873,500 1,430,400
Total fair value measurement gain/(loss) 4,792 112
Mortgages Held for Sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Notional Amount 395,821 557,540
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure $ 396,678 $ 571,596