Parent Company Only Condensed Financial Information - Schedule of Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 42,964	$ 39,427	$ 40,546
Adjustment to reconcile net income to net cash from operating activities:
Net cash provided by operating activities	62,698	25,183	40,761
Cash flows used for investing activities:
Acquisition and additional capitalization of subsidiary, net of cash acquired		(51,643)
Net cash used in investing activities	(311,784)	(410,364)	(130,496)
Cash flows from financing activities:
Net cash provided by financing activities	266,131	164,303	216,925
Increase (decrease) in cash and due from financial institutions	17,045	(220,878)	127,190
CBI[Member]
Operating activities:
Net income	42,964	39,427	40,546
Adjustment to reconcile net income to net cash from operating activities:
Change in other assets and other liabilities	(12,836)	4,587	2,495
Equity in undistributed net earnings of subsidiaries	(18,382)	(16,662)	(21,228)
Net cash provided by operating activities	11,746	27,352	21,813
Cash flows used for investing activities:
Disposal of minority interest			11,500
Acquisition and additional capitalization of subsidiary, net of cash acquired	(14,000)	(25,960)	(50,000)
Net cash used in investing activities	(14,000)	(25,960)	(38,500)
Cash flows from financing activities:
Proceeds from subordinated debenture, net of issuance costs			73,386
Purchase of treasury stock	(1,628)	(16,887)	(22,309)
Cash dividends paid	(9,599)	(8,493)	(8,036)
Net cash provided by financing activities	(11,227)	(25,380)	43,041
Increase (decrease) in cash and due from financial institutions	(13,481)	(23,988)	26,354
Cash and cash equivalents at beginning of year	21,812	45,800	19,446
Cash and cash equivalents at end of year	$ 8,331	$ 21,812	$ 45,800