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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 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets |  |
Loans held for sale | $ 55,646 | $ 29,233
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets |  |
Cash and short-term investments | 60,026 | 15,026
Federal funds sold | 480 | 546
Significant Observable Inputs (Level 2) [Member] |  |
Financial Assets |  |
Investment securities | 129,359 | 58,688
Loans held for sale | 55,646 | 29,233
Accrued interest receivable | 2,590 | 1,769
Bank-owned life insurance | 14,734 | 8,455
Financial Liabilities |  |
Deposits | 542,805 | 323,280
Other borrowed funds | 124,971 | 73,113
Accrued interest payable | 706 | 395
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets |  |
Net loans held for investment | 643,878 | 404,888
Financial Liabilities |  |
Deposits | 168,736 | 81,070
Subordinated debt, net | 9,874 | 9,766
Carrying Amount |  |
Financial Assets |  |
Cash and short-term investments | 60,026 | 15,026
Federal funds sold | 480 | 546
Investment securities | 128,897 | 58,750
Loans held for sale | 55,646 | 29,233
Net loans held for investment | 642,262 | 411,288
Accrued interest receivable | 2,590 | 1,769
Bank-owned life insurance | 14,734 | 8,455
Financial Liabilities |  |
Deposits | 722,030 | 415,027
Other borrowed funds | 124,800 | 73,100
Subordinated debt, net | 9,800 | 9,766
Accrued interest payable | 706 | 395
Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 60,026 | 15,026
Federal funds sold | 480 | 546
Investment securities | 129,359 | 58,688
Loans held for sale | 55,646 | 29,233
Net loans held for investment | 643,878 | 404,888
Accrued interest receivable | 2,590 | 1,769
Bank-owned life insurance | 14,734 | 8,455
Financial Liabilities |  |
Deposits | 711,541 | 404,350
Other borrowed funds | 124,971 | 73,113
Subordinated debt, net | 9,874 | 9,766
Accrued interest payable | $ 706 | $ 395

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