v3.26.1
Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 55,509,000 $ 63,836,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Liability Derivatives $ 55,618,000 $ 64,394,000
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Interest Rate Swaps and Caps [Member] | Loan Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 2,708,550,000 $ 2,612,677,000
Asset Derivatives 54,650,000 63,144,000
Liability Derivatives 55,492,000 64,181,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 35,528,000 27,615,000
Asset Derivatives 859,000 692,000
Liability Derivatives 0 0
Forward TBA Contracts [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 76,000,000 91,000,000
Asset Derivatives 0 0
Liability Derivatives $ 126,000 $ 213,000