Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 97,424,000	$ 75,893,000
Liability Derivatives	95,644,000	74,726,000
Interest Rate Swaps and Caps [Member] | Loan Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	1,371,993,000	936,834,000
Asset Derivatives	97,215,000	75,840,000
Liability Derivatives	95,567,000	74,683,000
Interest Rate Lock Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	21,505,000	10,071,000
Liability Derivatives	77,000	43,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	29,500,000	14,500,000
Asset Derivatives	$ 209,000	$ 53,000