Non-interest Income and Expense - Components of Non Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other Income and Expenses [Abstract]
Base salaries, net of deferred loan origination costs	$ 18,216	$ 15,511
Incentive compensation	2,583	3,580
Benefits and other compensation costs	5,972	6,239
Total salaries and benefits expense	26,771	25,330
Occupancy	3,575	3,726
Data processing and software	3,513	3,202
Equipment	1,333	1,517
Intangible amortization	1,228	1,431
Advertising	637	380
ATM and POS network charges	1,375	1,246
Professional fees	876	594
Telecommunications	521	581
Regulatory assessments and insurance	720	612
Merger and acquisition expense	4,032	0
Postage	228	198
Operational (gain) losses	(183)	209
Courier service	414	294
Gain on sale or acquisition of foreclosed assets	0	(51)
Gain on disposal of fixed assets	(1,078)	0
Other miscellaneous expense	2,485	2,349
Total other non-interest expense	19,676	16,288
Total non-interest expense	$ 46,447	$ 41,618