Condensed Financial Information - Parent Company Only - Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income
Other income (loss)	$ 905	$ 979	$ 268
Expense
Noninterest expenses	182,974	188,208	140,757
Income taxes benefit	26,053	36,623	32,294
Net Income	84,740	107,369	95,041
Parent Company
Income
Dividends from subsidiaries	48,299	52,988	50,648
Other income (loss)	142	79	34
Total Income	48,441	53,067	50,682
Expense
Interest on subordinated debentures	8,528	6,825	5,419
Noninterest expenses	565	542	1,498
Total Expense	9,093	7,367	6,917
Income before benefit for income taxes	39,348	45,700	43,765
Income taxes benefit	(2,030)	(1,530)	(1,445)
Income before equity in undistributed income of subsidiaries	41,378	47,230	45,210
Equity in undistributed income of subsidiaries	43,362	60,139	49,831
Net Income	$ 84,740	$ 107,369	$ 95,041