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Off-Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Commitments to make loans | Fixed Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | $ 46,265 | $ 46,701
Commitments to make loans | Variable Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | 191,803 | 196,449
Unused lines of credit | Fixed Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | 14,390 | 14,565
Unused lines of credit | Variable Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | 429,456 | 373,618
Standby letters of credit | Fixed Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | 14,831 | 13,706
Standby letters of credit | Variable Rate |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet risks, amount, liability | $ 1,479 | $ 1,524

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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