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Fair Value Measurement - Carrying Amount and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |
Cash and due from financial institutions | $ 33,229 | $ 35,561 | $ 33,619 | $ 29,858
Securities available for sale | 200,967 | 196,249 |  |
Loans, net of allowance for loan losses | 1,033,516 | 987,166 |  |
Other securities | 13,926 | 13,452 |  |
Bank owned life insurance | 24,404 | 20,104 |  |
Accrued interest receivable | 4,547 | 3,902 |  |
Financial Liabilities: |  |  |  |
Securities sold under agreement to repurchase | 21,713 | 25,040 |  |
Carrying Amount [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 33,229 | 35,561 |  |
Securities available for sale | 200,967 | 196,249 |  |
Loans, held for sale | 2,827 | 2,698 |  |
Loans, net of allowance for loan losses | 1,033,516 | 987,166 |  |
Other securities | 13,926 | 13,452 |  |
Bank owned life insurance | 24,404 | 20,104 |  |
Accrued interest receivable | 4,547 | 3,902 |  |
Swap asset | 3,705 |  |  |
Swap asset |  | 1,962 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 915,360 | 840,984 |  |
Time deposits | 218,793 | 211,049 |  |
Short-term FHLB advances | 17,500 | 53,700 |  |
Long-term FHLB advances | 17,500 | 17,500 |  |
Securities sold under agreement to repurchase | 21,713 | 25,040 |  |
Subordinated debentures | 29,427 | 29,427 |  |
Accrued interest payable | 137 | 120 |  |
Swap liability | 3,705 |  |  |
Swap liability |  | 1,962 |  |
Total Fair Value [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 33,229 | 35,561 |  |
Securities available for sale | 200,967 | 196,249 |  |
Loans, held for sale | 2,827 | 2,698 |  |
Loans, net of allowance for loan losses | 1,037,955 | 986,848 |  |
Other securities | 13,926 | 13,452 |  |
Bank owned life insurance | 24,404 | 20,104 |  |
Accrued interest receivable | 4,547 | 3,902 |  |
Swap asset | 3,705 |  |  |
Swap asset |  | 1,962 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 915,360 | 840,984 |  |
Time deposits | 219,345 | 212,006 |  |
Short-term FHLB advances | 17,394 | 52,906 |  |
Long-term FHLB advances | 17,710 | 17,687 |  |
Securities sold under agreement to repurchase | 21,713 | 25,040 |  |
Subordinated debentures | 30,367 | 25,572 |  |
Accrued interest payable | 137 | 120 |  |
Swap liability | 3,705 | 1,962 |  |
(Level 1) [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 33,229 | 35,561 |  |
Loans, held for sale | 2,827 | 2,698 |  |
Other securities | 13,926 | 13,452 |  |
Bank owned life insurance | 24,404 | 20,104 |  |
Accrued interest receivable | 4,547 | 3,902 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 915,360 | 840,984 |  |
Short-term FHLB advances | 17,394 | 52,906 |  |
Securities sold under agreement to repurchase | 21,713 | 25,040 |  |
Accrued interest payable | 137 | 120 |  |
(Level 2) [Member] |  |  |  |
Financial Assets: |  |  |  |
Securities available for sale | 200,967 | 196,249 |  |
Swap asset | 3,705 |  |  |
Swap asset |  | 1,962 |  |
Financial Liabilities: |  |  |  |
Swap liability | 3,705 | 1,962 |  |
(Level 3) [Member] |  |  |  |
Financial Assets: |  |  |  |
Loans, net of allowance for loan losses | 1,037,955 | 986,848 |  |
Financial Liabilities: |  |  |  |
Time deposits | 219,345 | 212,006 |  |
Long-term FHLB advances | 17,710 | 17,687 |  |
Subordinated debentures | $ 30,367 | $ 25,572 |  |

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