Non-interest Income and Expense - Components of Non Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Base salaries, net of deferred loan origination costs	$ 22,169	$ 17,537	$ 40,385	$ 33,048
Incentive compensation	4,282	4,322	6,865	7,902
Benefits and other compensation costs	6,491	5,222	12,463	11,461
Total salaries and benefits expense	32,942	27,081	59,713	52,411
Occupancy	3,996	3,700	7,571	7,426
Data processing and software	3,596	3,201	7,109	6,403
Equipment	1,453	1,207	2,786	2,724
Intangible amortization	1,702	1,431	2,930	2,862
Advertising	818	734	1,455	1,114
ATM and POS network charges	1,781	1,551	3,156	2,797
Professional fees	1,233	1,046	2,109	1,640
Telecommunications	564	564	1,085	1,145
Regulatory assessments and insurance	779	618	1,499	1,230
Merger and acquisition expense	2,221	0	6,253	0
Postage	313	124	541	322
Operational losses	456	212	273	421
Courier service	486	288	900	582
Gain on sale or acquisition of foreclosed assets	(98)	(15)	(98)	(66)
Loss (gain) on disposal of fixed assets	5	(426)	(1,073)	(426)
Other miscellaneous expense	4,017	2,855	6,502	5,204
Total other non-interest expense	23,322	17,090	42,998	33,378
Total non-interest expense	$ 56,264	$ 44,171	$ 102,711	$ 85,789