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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 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Loans held for sale | $ 90,019 | $ 55,646
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and short-term investments | 67,158 | 60,026
Federal funds sold | 164 | 480
Significant Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Investment securities | 121,690 | 129,359
Loans held for sale | 90,019 | 55,646
Accrued interest receivable | 2,486 | 2,590
Bank-owned life insurance | 14,827 | 14,734
Financial Liabilities |  |
Deposits | 598,213 | 542,805
Other borrowed funds | 142,239 | 124,971
Accrued interest payable | 674 | 706
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Net loans held for investment | 696,476 | 643,878
Financial Liabilities |  |
Deposits | 176,931 | 168,736
Subordinated debt, net | 9,809 | 9,784
Carrying Amount |  |
Financial Assets |  |
Cash and short-term investments | 67,158 | 60,026
Federal funds sold | 164 | 480
Investment securities | 120,255 | 128,897
Loans held for sale | 90,019 | 55,646
Net loans held for investment | 666,038 | 642,262
Accrued interest receivable | 2,486 | 2,590
Bank-owned life insurance | 14,827 | 14,734
Financial Liabilities |  |
Deposits | 769,160 | 722,030
Other borrowed funds | 140,900 | 124,800
Subordinated debt, net | 9,809 | 9,800
Accrued interest payable | 674 | 706
Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 67,158 | 60,026
Federal funds sold | 164 | 480
Investment securities | 121,690 | 129,359
Loans held for sale | 90,019 | 55,646
Net loans held for investment | 696,476 | 643,878
Accrued interest receivable | 2,486 | 2,590
Bank-owned life insurance | 14,827 | 14,734
Financial Liabilities |  |
Deposits | 775,144 | 711,541
Other borrowed funds | 142,239 | 124,971
Subordinated debt, net | 9,809 | 9,784
Accrued interest payable | $ 674 | $ 706

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