Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	$ (62,104)
Other comprehensive income (loss)	11,458	$ (45,751)	$ 5,791
Ending balance	(50,646)	(62,104)
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(40,066)	(1,216)	(1,379)
Other comprehensive income (loss)	5,745	(38,850)	163
Ending balance	(34,321)	(40,066)	(1,216)
Net Change Related to Derivative Used for Cash Flow Hedge [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(6,831)	(159)	(421)
Other comprehensive income (loss)	2,265	(6,672)	262
Ending balance	(4,566)	(6,831)	(159)
Net Change Related to Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(15,207)	(14,978)	(20,344)
Other comprehensive income (loss)	3,448	(229)	5,366
Ending balance	(11,759)	(15,207)	(14,978)
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(62,104)	(16,353)	(22,144)
Other comprehensive income (loss)	11,458	(45,751)	5,791
Ending balance	$ (50,646)	$ (62,104)	$ (16,353)