Condensed Financial Information - Parent Company Only - Schedule of Condensed Income Statement (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statements of Income
Interest expense	$ 33,896,000	$ 21,348,000	$ 29,584,000
Income before income taxes	97,210,000	114,330,000	56,897,000
Income tax expense	19,090,000	22,529,000	9,981,000
Equity in undistributed income of subsidiaries:
Net income	78,120,000	91,801,000	46,916,000
Parent Company [Member]
Statements of Income
Dividends from Bank	23,303,000	57,526,000	9,746,000
Dividends from non-bank	0	0	0
Other income	28,630,000	23,009,000	21,803,000
Total operating income	51,933,000	80,535,000	31,549,000
Interest expense	5,798,000	7,149,000	6,762,000
Operating expenses	30,297,000	26,464,000	22,852,000
Income before income taxes	15,838,000	46,922,000	1,935,000
Income tax expense	(1,983,000)	(2,668,000)	(1,555,000)
Income before equity in undistributed income of subsidiaries	17,821,000	49,590,000	3,490,000
Equity in undistributed income of subsidiaries:
Bank	60,299,000	42,211,000	43,426,000
Non-banks	0	0	0
Net income	$ 78,120,000	$ 91,801,000	$ 46,916,000