Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	$ (16,353)
Cumulative effect on retained earnings	776,500	$ 773,794	$ 692,472	$ 675,122
Other comprehensive income (loss)	(45,751)	5,791	(651)
Ending balance	(62,104)	(16,353)
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(1,216)	(1,379)	(3,231)
Other comprehensive income (loss)	(38,850)	163	1,615
Ending balance	(40,066)	(1,216)	(1,379)
Net Change Related to Derivative Used for Cash Flow Hedge [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(159)	(421)	(185)
Other comprehensive income (loss)	(6,672)	262	(236)
Ending balance	(6,831)	(159)	(421)
Net Change Related to Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(14,978)	(20,344)	(18,314)
Other comprehensive income (loss)	(229)	5,366	(2,030)
Ending balance	(15,207)	(14,978)	(20,344)
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Beginning balance	(16,353)	(22,144)	(21,730)
Cumulative effect on retained earnings	(62,104)	(16,353)	(22,144)	(21,730)
Other comprehensive income (loss)	(45,751)	5,791	(651)
Ending balance	$ (62,104)	$ (16,353)	$ (22,144)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Cumulative effect on retained earnings				(11,047)
Accounting Standards Update 2016-13 | Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Cumulative effect on retained earnings				237
Accounting Standards Update 2016-13 | Net Change Related to Derivative Used for Cash Flow Hedge [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Cumulative effect on retained earnings				0
Accounting Standards Update 2016-13 | Net Change Related to Defined Benefit Pension Plan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Cumulative effect on retained earnings				0
Accounting Standards Update 2016-13 | Accumulated Other Comprehensive (Loss) Income [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Line Items]
Cumulative effect on retained earnings				$ 237