Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 66,471,000	$ 72,458,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Liability Derivatives	$ 68,163,000	$ 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	$ 2,108,303,000	$ 1,906,520,000
Asset Derivatives	64,943,000	72,343,000
Liability Derivatives	66,526,000	72,204,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	52,657,000	15,476,000
Asset Derivatives	1,528,000
Liability Derivatives		41,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	173,000,000	29,000,000
Asset Derivatives		$ 115,000
Liability Derivatives	$ 1,637,000