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Fair Value of Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |
Cash and Cash Equivalents | $ 31,498 | $ 22,018 | $ 31,218 | $ 24,295
Interest-bearing time deposits | 1,915 |  |  |
Securities-available-for-sale | 224,473 | 235,115 |  |
Other Securities | 3,717 | 3,717 |  |
Loans, net | 732,070 | 679,821 |  |
Financial Liabilities: |  |  |  |
Non-interest bearing Deposits | 176,180 | 171,112 |  |
Time Deposits | 212,042 | 184,285 |  |
Total deposits | 838,101 | 771,339 |  |
Fed Funds purchased and Securities sold under agreements to repurchase | 59,487 | 78,815 |  |
Federal Home Loan Bank advances | 10,000 | 10,000 |  |
Carrying Amount [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and Cash Equivalents | 31,498 | 22,018 |  |
Interest-bearing time deposits | 1,915 |  |  |
Securities-available-for-sale | 224,473 | 235,115 |  |
Other Securities | 3,717 | 3,717 |  |
Loans, net | 732,070 | 679,821 |  |
Interest receivable | 4,430 | 3,589 |  |
Financial Liabilities: |  |  |  |
Interest bearing Deposits | 449,879 | 415,942 |  |
Non-interest bearing Deposits | 176,180 | 171,112 |  |
Time Deposits | 212,042 | 184,285 |  |
Total deposits | 838,101 | 771,339 |  |
Fed Funds purchased and Securities sold under agreements to repurchase | 59,487 | 78,815 |  |
Federal Home Loan Bank advances | 10,000 | 10,000 |  |
Interest payable | 228 | 185 |  |
Fair Value [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and Cash Equivalents | 31,498 | 22,018 |  |
Interest-bearing time deposits | 1,915 |  |  |
Securities-available-for-sale | 224,473 | 235,115 |  |
Other Securities | 3,717 | 3,717 |  |
Loans, net | 735,456 | 683,332 |  |
Interest receivable | 4,430 | 3,589 |  |
Financial Liabilities: |  |  |  |
Interest bearing Deposits | 449,879 | 415,942 |  |
Non-interest bearing Deposits | 176,180 | 171,112 |  |
Time Deposits | 212,254 | 184,308 |  |
Total deposits | 838,313 | 771,362 |  |
Fed Funds purchased and Securities sold under agreements to repurchase | 59,487 | 78,815 |  |
Federal Home Loan Bank advances | 10,041 | 9,986 |  |
Interest payable | 228 | 185 |  |
Level 1 [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and Cash Equivalents | 31,498 | 22,018 |  |
Securities-available-for-sale | 31,059 | 38,505 |  |
Level 2 [Member] |  |  |  |
Financial Assets: |  |  |  |
Interest-bearing time deposits | 1,915 |  |  |
Securities-available-for-sale | 191,873 | 189,258 |  |
Financial Liabilities: |  |  |  |
Non-interest bearing Deposits | 176,180 | 171,112 |  |
Total deposits | 176,180 | 171,112 |  |
Level 3 [Member] |  |  |  |
Financial Assets: |  |  |  |
Securities-available-for-sale | 1,541 | 7,352 |  |
Other Securities | 3,717 | 3,717 |  |
Loans, net | 735,456 | 683,332 |  |
Interest receivable | 4,430 | 3,589 |  |
Financial Liabilities: |  |  |  |
Interest bearing Deposits | 449,879 | 415,942 |  |
Time Deposits | 212,254 | 184,308 |  |
Total deposits | 662,133 | 600,250 |  |
Fed Funds purchased and Securities sold under agreements to repurchase | 59,487 | 78,815 |  |
Federal Home Loan Bank advances | 10,041 | 9,986 |  |
Interest payable | $ 228 | $ 185 |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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