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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	Jun. 30, 2021	Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2019
Financial Assets
Cash and due from banks	$ 296,425	$ 117,945	[1]	$ 241,136	$ 60,026
Securities available for sale	261,309	109,475	[1]
Restricted equity and other investments	13,228	11,173	[1]
Financial Liabilities
Noninterest-bearing demand deposits	660,937	333,051	[1]
Savings	143,908	78,352	[1]
Time deposits	572,970	251,443	[1]
FHLB borrowings	125,118	115,000	[1]
Subordinated notes, net	46,149	24,506	[1]
Carrying Value
Financial Assets
Cash and due from banks	296,425	117,945
Federal funds sold	2,273	775
Securities available for sale	261,309	109,475
Restricted equity and other investments	15,310	11,173
PPP loans receivable, net	130,193	288,533
Loans held for investment, net	1,716,670	719,056
Accrued interest receivable	11,072	5,428
Bank owned life insurance	46,001	15,724
Financial Liabilities
Noninterest-bearing demand deposits	660,937	333,051
Interest-bearing demand and money market deposits	812,756	282,263
Savings	143,908	78,352
Time deposits	572,970	251,443
FHLB borrowings	125,118	115,000
FRB borrowings	97,384	281,650
Subordinated notes, net	46,149	24,506
Fair Value
Financial Assets
Cash and due from banks	296,425	117,945
Federal funds sold	2,273	775
Securities available for sale	261,309	109,475
Restricted equity and other investments	15,310	11,173
PPP loans receivable, net	130,193	288,533
Loans held for investment, net	1,720,233	720,396
Accrued interest receivable	11,072	5,428
Bank owned life insurance	46,001	15,724
Financial Liabilities
Noninterest-bearing demand deposits	660,937	333,051
Interest-bearing demand and money market deposits	812,756	282,263
Savings	143,908	78,352
Time deposits	578,830	257,647
FHLB borrowings	124,884	114,983
FRB borrowings	97,384	281,650
Subordinated notes, net	49,130	25,830
Level 1 [Member]
Financial Assets
Cash and due from banks	296,425	117,945
Federal funds sold	2,273	775
Financial Liabilities
Noninterest-bearing demand deposits	660,937	333,051
Level 2 [Member]
Financial Assets
Securities available for sale	261,309	109,475
Restricted equity and other investments	15,310	11,173
Accrued interest receivable	11,072	5,428
Bank owned life insurance	46,001	15,724
Financial Liabilities
Interest-bearing demand and money market deposits	812,756	282,263
Savings	143,908	78,352
FHLB borrowings	124,884	114,983
FRB borrowings	97,384	281,650
Level 3 [Member]
Financial Assets
PPP loans receivable, net	130,193	288,533
Loans held for investment, net	1,720,233	720,396
Financial Liabilities
Time deposits	578,830	257,647
Subordinated notes, net	$ 49,130	$ 25,830
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

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