Parent Company Only Condensed Financial Information - Schedule of Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements Captions [Line Items]
Interest expense	$ (57,238)	$ (15,951)	$ (9,629)
Income tax benefit	(7,649)	(7,608)	(7,835)
Net income	42,964	39,427	40,546
Comprehensive income (loss)	53,479	(27,438)	34,747
CBI[Member]
Condensed Financial Statements Captions [Line Items]
Dividends from bank subsidiaries	28,100	26,300	19,900
Dividends from non-bank subsidiaries	1,390	1,150	1,000
Interest expense	(4,849)	(3,781)	(956)
Pension expense	150	340	(47)
Other expense, net	(1,518)	(2,384)	(1,004)
Income before equity in undistributed net earnings of subsidiaries	23,273	21,625	18,893
Income tax benefit	1,309	1,140	425
Equity in undistributed net earnings of subsidiaries	18,382	16,662	21,228
Net income	42,964	39,427	40,546
Comprehensive income (loss)	$ 53,489	$ (27,438)	$ 34,747