Condensed Financial Information - Parent Company Only - Schedule of Condensed Income Statement (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statements of Income
Interest expense	$ 151,733,000	$ 33,896,000	$ 21,348,000
Income before income taxes	88,689,000	97,210,000	114,330,000
Income tax expense	17,585,000	19,090,000	22,529,000
Equity in undistributed income of subsidiaries:
Net income	71,104,000	78,120,000	91,801,000
Parent Company [Member]
Statements of Income
Dividends from Bank	18,386,000	23,303,000	57,526,000
Dividends from non-bank	0	0	0
Other income	25,000,000	28,630,000	23,009,000
Total operating income	43,386,000	51,933,000	80,535,000
Interest expense	9,125,000	5,798,000	7,149,000
Operating expenses	27,627,000	30,297,000	26,464,000
Income before income taxes	6,634,000	15,838,000	46,922,000
Income tax expense	(2,751,000)	(1,983,000)	(2,668,000)
Income before equity in undistributed income of subsidiaries	9,385,000	17,821,000	49,590,000
Equity in undistributed income of subsidiaries:
Bank	61,719,000	60,299,000	42,211,000
Non-banks	0	0	0
Net income	$ 71,104,000	$ 78,120,000	$ 91,801,000