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Fair Value - Summary of Estimated Fair Values and Related Carrying Amounts and Valuation Level of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020		Mar. 31, 2020	Dec. 31, 2019
Financial Assets
Cash and due from banks	$ 273,540	$ 117,945	[1]	$ 67,158	$ 60,026
Securities available for sale	278,734	109,475	[1]
Restricted equity and other investments	14,821	11,173	[1]
Financial Liabilities
Noninterest-bearing demand deposits	617,102	333,051	[1]
Savings	159,455	78,352	[1]
Time deposits	612,171	251,443	[1]
Securities sold under repurchase agreements	1,198
FHLB borrowings	183,122	115,000	[1]
Subordinated notes, net	54,588	24,506	[1]
Carrying Value
Financial Assets
Cash and due from banks	273,540	117,945
Federal funds sold	5,238	775
Certificates of deposit	1,018
Securities available for sale	278,734	109,475
Restricted equity and other investments	14,821	11,173
PPP loans receivable, net	597,626	288,533
Loans held for investment, net	1,693,514	719,056
Accrued interest receivable	10,507	5,428
Bank owned life insurance	36,164	15,724
Financial Liabilities
Noninterest-bearing demand deposits	617,102	333,051
Interest-bearing demand and money market deposits	751,390	282,263
Savings	159,455	78,352
Time deposits	612,171	251,443
Securities sold under repurchase agreements	1,198
FHLB borrowings	183,122	115,000
FRB borrowings	509,667	281,650
Subordinated notes, net	54,588	24,506
Fair Value
Financial Assets
Cash and due from banks	273,540	117,945
Federal funds sold	5,238	775
Certificates of deposit	1,018
Securities available for sale	278,734	109,475
Restricted equity and other investments	14,821	11,173
PPP loans receivable, net	597,626	288,533
Loans held for investment, net	1,713,201	720,396
Accrued interest receivable	10,507	5,428
Bank owned life insurance	36,164	15,724
Financial Liabilities
Noninterest-bearing demand deposits	617,102	333,051
Interest-bearing demand and money market deposits	751,390	282,263
Savings	159,455	78,352
Time deposits	618,166	257,647
Securities sold under repurchase agreements	1,198
FHLB borrowings	182,890	114,983
FRB borrowings	509,667	281,650
Subordinated notes, net	56,342	25,830
Level 1 [Member]
Financial Assets
Cash and due from banks	273,540	117,945
Federal funds sold	5,238	775
Financial Liabilities
Noninterest-bearing demand deposits	617,102	333,051
Securities sold under repurchase agreements	1,198
Level 2 [Member]
Financial Assets
Certificates of deposit	1,018
Securities available for sale	278,734	109,475
Restricted equity and other investments	14,821	11,173
Accrued interest receivable	10,507	5,428
Bank owned life insurance	36,164	15,724
Financial Liabilities
Interest-bearing demand and money market deposits	751,390	282,263
Savings	159,455	78,352
FHLB borrowings	182,890	114,983
FRB borrowings	509,667	281,650
Level 3 [Member]
Financial Assets
PPP loans receivable, net	597,626	288,533
Loans held for investment, net	1,713,201	720,396
Financial Liabilities
Time deposits	618,166	257,647
Subordinated notes, net	$ 56,342	$ 25,830
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

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