Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 68,165,000	$ 72,458,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Liability Derivatives	$ 68,178,000	$ 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	$ 2,085,861,000	$ 1,906,520,000
Asset Derivatives	66,947,000	72,343,000
Liability Derivatives	67,833,000	72,204,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	48,329,000	15,476,000
Asset Derivatives	1,218,000
Liability Derivatives	0	41,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	294,000,000	29,000,000
Asset Derivatives		$ 115,000
Liability Derivatives	$ 345,000