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Off Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Commitments to Make Loans [Member] | Fixed Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | $ 57,283 | $ 42,803
Commitments to Make Loans [Member] | Variable Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | 202,883 | 259,032
Unused Lines of Credit [Member] | Fixed Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | 0 | 0
Unused Lines of Credit [Member] | Variable Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | 105,779 | 87,493
Standby Letters of Credit [Member] | Fixed Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | 0 | 0
Standby Letters of Credit [Member] | Variable Rate [Member] |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |
Off-balance sheet risks, amount, liability | $ 4,618 | $ 15,704

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