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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Loans held for sale | $ 127,796 | $ 55,646
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and short-term investments | 241,136 | 60,026
Federal funds sold | 452 | 480
Significant Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Investment securities | 114,003 | 129,359
Loans held for sale | 127,796 | 55,646
Accrued interest receivable | 4,119 | 2,590
Bank-owned life insurance | 14,919 | 14,734
Financial Liabilities |  |
Deposits | 690,229 | 542,805
Other borrowed funds | 476,750 | 124,971
Accrued interest payable | 678 | 706
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Net loans held for investment | 1,013,388 | 643,878
Financial Liabilities |  |
Deposits | 283,368 | 168,736
Subordinated debt, net | 24,472 | 9,784
Carrying Amount |  |
Financial Assets |  |
Cash and short-term investments | 241,136 | 60,026
Federal funds sold | 452 | 480
Investment securities | 114,003 | 128,897
Loans held for sale | 127,796 | 55,646
Net loans held for investment | 1,013,259 | 642,262
Accrued interest receivable | 4,119 | 2,590
Bank-owned life insurance | 14,919 | 14,734
Financial Liabilities |  |
Deposits | 965,857 | 722,030
Other borrowed funds | 478,411 | 124,800
Subordinated debt, net | 24,472 | 9,800
Accrued interest payable | 678 | 706
Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 241,136 | 60,026
Federal funds sold | 452 | 480
Investment securities | 114,003 | 129,359
Loans held for sale | 127,796 | 55,646
Net loans held for investment | 1,013,388 | 643,878
Accrued interest receivable | 4,119 | 2,590
Bank-owned life insurance | 14,919 | 14,734
Financial Liabilities |  |
Deposits | 973,597 | 711,541
Other borrowed funds | 476,750 | 124,971
Subordinated debt, net | 24,472 | 9,784
Accrued interest payable | $ 678 | $ 706

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