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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Not Measured at Fair Value on a Recurring or Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |
Cash and due from financial institutions | $ 64,754 | $ 40,519 | $ 33,394 | $ 36,695
Other securities | 17,774 | 14,247 |  |
Loans, net of allowance | 1,502,313 | 1,151,527 |  |
Bank owned life insurance | 42,750 | 25,125 |  |
Accrued interest receivable | 6,878 | 4,488 |  |
Financial Liabilities: |  |  |  |
Securities sold under agreement to repurchase | 18,515 | 21,755 |  |
Carrying Amount [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 64,754 | 40,519 |  |
Other securities | 17,774 | 14,247 |  |
Loans, held for sale | 4,025 | 2,197 |  |
Loans, net of allowance | 1,502,313 | 1,151,527 |  |
Bank owned life insurance | 42,750 | 25,125 |  |
Accrued interest receivable | 6,878 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,300,365 | 981,021 |  |
Time deposits | 277,390 | 223,902 |  |
Short-term FHLB advances | 140,100 | 56,900 |  |
Long-term FHLB advances | 5,000 | 15,000 |  |
Securities sold under agreement to repurchase | 18,515 | 21,755 |  |
Subordinated debentures | 29,427 | 29,427 |  |
Accrued interest payable | 184 | 410 |  |
Total Fair Value [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 64,754 | 40,519 |  |
Other securities | 17,774 | 14,247 |  |
Loans, held for sale | 4,025 | 2,197 |  |
Loans, net of allowance | 1,495,951 | 1,146,969 |  |
Bank owned life insurance | 42,750 | 25,125 |  |
Accrued interest receivable | 6,878 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,300,365 | 981,021 |  |
Time deposits | 278,680 | 223,626 |  |
Short-term FHLB advances | 140,100 | 56,900 |  |
Long-term FHLB advances | 4,985 | 14,964 |  |
Securities sold under agreement to repurchase | 18,515 | 21,755 |  |
Subordinated debentures | 32,016 | 31,052 |  |
Accrued interest payable | 184 | 410 |  |
(Level 1) [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 64,754 | 40,519 |  |
Other securities | 17,774 | 14,247 |  |
Loans, held for sale | 4,025 | 2,197 |  |
Bank owned life insurance | 42,750 | 25,125 |  |
Accrued interest receivable | 6,878 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,300,365 | 981,021 |  |
Short-term FHLB advances | 140,100 | 56,900 |  |
Securities sold under agreement to repurchase | 18,515 | 21,755 |  |
Accrued interest payable | 184 | 410 |  |
(Level 3) [Member] |  |  |  |
Financial Assets: |  |  |  |
Loans, net of allowance | 1,495,951 | 1,146,969 |  |
Financial Liabilities: |  |  |  |
Time deposits | 278,680 | 223,626 |  |
Long-term FHLB advances | 4,985 | 14,964 |  |
Subordinated debentures | $ 32,016 | $ 31,052 |  |

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