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Disclosures About Fair Value of Financial Instruments - Summary of Estimated Fair Values and Related Carrying amounts of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Loans held for sale | $ 193,122 | $ 55,646
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and short-term investments | 77,596 | 60,026
Federal funds sold |  | 480
Financial Liabilities |  |
Federal funds purchased | 135 |
Significant Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Investment securities | 123,330 | 129,359
Loans held for sale | 193,122 | 55,646
Accrued interest receivable | 5,193 | 2,590
Bank-owned life insurance | 15,013 | 14,734
Financial Liabilities |  |
Deposits | 643,704 | 542,805
Other borrowed funds | 459,476 | 124,971
Accrued interest payable | 644 | 706
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Net loans held for investment | 1,034,898 | 643,878
Financial Liabilities |  |
Deposits | 278,584 | 168,736
Subordinated debt, net | 25,326 | 9,784
Carrying Amount |  |
Financial Assets |  |
Cash and short-term investments | 77,596 | 60,026
Federal funds sold |  | 480
Investment securities | 123,330 | 128,897
Loans held for sale | 193,122 | 55,646
Net loans held for investment | 1,039,180 | 642,262
Accrued interest receivable | 5,193 | 2,590
Bank-owned life insurance | 15,013 | 14,734
Financial Liabilities |  |
Deposits | 915,266 | 722,030
Federal funds purchased | 135 |
Other borrowed funds | 459,476 | 124,800
Subordinated debt, net | 24,489 | 9,800
Accrued interest payable | 644 | 706
Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 77,596 | 60,026
Federal funds sold |  | 480
Investment securities | 123,330 | 129,359
Loans held for sale | 193,122 | 55,646
Net loans held for investment | 1,034,898 | 643,878
Accrued interest receivable | 5,193 | 2,590
Bank-owned life insurance | 15,013 | 14,734
Financial Liabilities |  |
Deposits | 922,288 | 711,541
Federal funds purchased | 135 |
Other borrowed funds | 459,476 | 124,971
Subordinated debt, net | 25,326 | 9,784
Accrued interest payable | $ 644 | $ 706

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