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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 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |
Cash and due from financial institutions | $ 41,156 | $ 40,519 | $ 39,515 | $ 36,695
Other securities | 14,247 | 14,247 |  |
Loans | 1,167,165 | 1,151,527 |  |
Bank owned life insurance | 25,411 | 25,125 |  |
Accrued interest receivable | 4,489 | 4,488 |  |
Financial Liabilities: |  |  |  |
Securities sold under agreement to repurchase | 14,230 | 21,755 |  |
Carrying Amount [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 41,156 | 40,519 |  |
Other securities | 14,247 | 14,247 |  |
Loans, held for sale | 4,058 | 2,197 |  |
Loans | 1,167,165 | 1,151,527 |  |
Bank owned life insurance | 25,411 | 25,125 |  |
Accrued interest receivable | 4,489 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,006,836 | 981,021 |  |
Time deposits | 139,336 | 223,902 |  |
Short-term FHLB advances | 151,200 | 56,900 |  |
Long-term FHLB advances | 5,000 | 15,000 |  |
Securities sold under agreement to repurchase | 14,230 | 21,755 |  |
Subordinated debentures | 29,427 | 29,427 |  |
Accrued interest payable | 102 | 410 |  |
Total Fair Value [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 41,156 | 40,519 |  |
Other securities | 14,247 | 14,247 |  |
Loans, held for sale | 4,058 | 2,197 |  |
Loans | 1,161,845 | 1,146,969 |  |
Bank owned life insurance | 25,411 | 25,125 |  |
Accrued interest receivable | 4,489 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,006,836 | 981,021 |  |
Time deposits | 138,624 | 223,626 |  |
Short-term FHLB advances | 151,200 | 56,900 |  |
Long-term FHLB advances | 4,996 | 14,964 |  |
Securities sold under agreement to repurchase | 14,230 | 21,755 |  |
Subordinated debentures | 32,312 | 31,052 |  |
Accrued interest payable | 102 | 410 |  |
(Level 1) [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and due from financial institutions | 41,156 | 40,519 |  |
Other securities | 14,247 | 14,247 |  |
Loans, held for sale | 4,058 | 2,197 |  |
Bank owned life insurance | 25,411 | 25,125 |  |
Accrued interest receivable | 4,489 | 4,488 |  |
Financial Liabilities: |  |  |  |
Nonmaturing deposits | 1,006,836 | 981,021 |  |
Short-term FHLB advances | 151,200 | 56,900 |  |
Securities sold under agreement to repurchase | 14,230 | 21,755 |  |
Accrued interest payable | 102 | 410 |  |
(Level 3) [Member] |  |  |  |
Financial Assets: |  |  |  |
Loans | 1,161,845 | 1,146,969 |  |
Financial Liabilities: |  |  |  |
Time deposits | 138,624 | 223,626 |  |
Long-term FHLB advances | 4,996 | 14,964 |  |
Subordinated debentures | $ 32,312 | $ 31,052 |  |

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- Definition The carrying amount of non maturing deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits and negotiable orders of withdrawal (NOW). + References No definition available. + Details
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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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