Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING INCOME
Interest on interest-bearing deposits	$ 58,848	$ 4,366	$ 6,049
OPERATING EXPENSE
Other	53,258	54,051	43,859
Allocated income tax benefit	(44,332)	(40,768)	(23,926)
Amortization of stock-based compensation arrangements of subsidiaries	(1,941)	(2,133)	(1,516)
Net income	193,100	167,630	99,586
Parent Company [Member]
OPERATING INCOME
Dividends from subsidiaries	93,139	54,480	50,872
Interest on interest-bearing deposits	94	41	1
Other	1,338	1,071	886
Total operating income	94,571	55,592	51,759
OPERATING EXPENSE
Interest	4,122	3,130	1,965
Other	7,190	3,340	3,317
Total operating expense	11,312	6,470	5,282
Income before taxes	83,259	49,122	46,477
Allocated income tax benefit	5,857	4,191	2,610
Income before equity in undistributed earnings of subsidiaries	89,116	53,313	49,087
Equity in undistributed earnings of subsidiaries	105,817	116,365	51,955
Amortization of stock-based compensation arrangements of subsidiaries	(1,833)	(2,048)	(1,456)
Net income	$ 193,100	$ 167,630	$ 99,586