Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 78,269,000	$ 72,267,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Liability Derivatives	$ 78,315,000	$ 73,288,000
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	$ 1,611,918,000	$ 1,573,152,000
Asset Derivatives	78,211,000	72,183,000
Liability Derivatives	78,312,000	73,083,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	23,009,000	16,524,000
Asset Derivatives	58,000	84,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	26,500,000	27,000,000
Liability Derivatives	$ 3,000	$ 205,000