Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 46,913,000	$ 24,876,000
Liability Derivatives	45,734,000	26,409,000
Interest Rate Swaps [Member] | Loan Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	751,704,000	730,552,000
Asset Derivatives	46,815,000	24,867,000
Liability Derivatives	45,734,000	26,388,000
Interest Rate Loan Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	21,616,000	28,994,000
Asset Derivatives	53,000	9,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	38,000,000.0	48,500,000
Asset Derivatives	$ 45,000
Liability Derivatives		$ 21,000