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Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 66,317,000 $ 72,458,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Liability Derivatives $ 67,354,000 $ 72,245,000
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 $ 2,321,157,000 $ 1,906,520,000
Asset Derivatives 65,321,000 72,343,000
Liability Derivatives 66,886,000 72,204,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 43,622,000 15,476,000
Asset Derivatives 996,000  
Liability Derivatives   41,000
Forward TBA Contracts [Member] | Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 137,500,000 29,000,000
Asset Derivatives   $ 115,000
Liability Derivatives $ 468,000