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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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