Non-interest Income and Expense - Components of Non Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Income and Expenses [Abstract]
Base salaries, net of deferred loan origination costs	$ 23,000	$ 18,216
Incentive compensation	2,895	2,583
Benefits and other compensation costs	6,668	5,972
Total salaries and benefits expense	32,563	26,771
Occupancy	4,160	3,575
Data processing and software	4,032	3,513
Equipment	1,383	1,333
Intangible amortization	1,656	1,228
Advertising	759	637
ATM and POS network charges	1,709	1,375
Professional fees	1,589	876
Telecommunications	595	521
Regulatory assessments and insurance	792	720
Merger and acquisition expense	0	4,032
Postage	299	228
Operational (gain) losses	435	(183)
Courier service	339	414
Gain on disposal of fixed assets	0	(1,078)
Other miscellaneous expense	3,483	2,485
Total other non-interest expense	21,231	19,676
Total non-interest expense	$ 53,794	$ 46,447