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Off Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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 | $ 42,803 | $ 28,831
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 | 259,032 | 254,269
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 | 87,493 | 80,428
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 | $ 15,704 | $ 15,132

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