Parent Company only Financial Information - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Net income	$ 3,181	$ 3,216	$ 4,162	$ 2,809	$ 1,785	$ 495	$ 1,550	$ 473	$ 13,368	$ 4,303
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities									16,209	14,753
Cash flow from investing activities:
Net cash used for investing activities									(59,013)	(453,838)
Cash flow from financing activities:
Proceeds from issuance of subordinated debt, net									29,224	20,000
Proceeds from exercised stock options									243	247
Net cash provided by financing activities									94,743	743,260
(Decrease) Increase in cash and cash equivalents									51,939	304,175
Cash and cash equivalents, beginning of period				418,517				114,342	418,517	114,342
Cash and cash equivalents, end of period	470,456				418,517				470,456	418,517
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income									13,368	4,303
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed (earnings) of subsidiary income									(14,792)	(5,452)
Change in other assets and other liabilities, net									(4,157)	(630)
Net cash provided by operating activities									(5,581)	(1,779)
Cash flow from investing activities:
Investment in subsidiary									(30,000)	(10,000)
Net cash used for investing activities									(30,000)	(10,000)
Cash flow from financing activities:
Proceeds from issuance of subordinated debt, net									34,224	20,000
Proceeds from exercised stock options									243	247
Net cash provided by financing activities									34,467	20,247
(Decrease) Increase in cash and cash equivalents									(1,114)	8,468
Cash and cash equivalents, beginning of period				$ 11,082				$ 2,614	11,082	2,614
Cash and cash equivalents, end of period	$ 9,968				$ 11,082				$ 9,968	$ 11,082