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Federal Income Taxes (Net Deferred Tax Asset) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Allowance for loan and lease losses | $ 2,442 | $ 2,097
Deferred Tax Assets, Loan Fees | 82 | 79
Deferred Tax Assets, Deferred Compensation | 906 | 313
Deferred Tax Assets, Benefit plans | 955 | 586
Deferred Tax Assets, Unrealized loss on securities | 1,504 |
Deferred Tax Assets, Nonaccrual interest |  | 554
Deferred Tax Assets, Business combination adjustments | 720 | 1,166
Deferred Tax Assets, Other | 177 | 170
Deferred Tax Assets, Gross, Total | 6,786 | 4,965
Deferred Tax Liabilities, Depreciation | (1,175) | (1,074)
Deferred Tax Liabilities, Bond accretion | (117) | (111)
Deferred Tax Liabilities, Goodwill and intangibles | (500) | (472)
Deferred Tax Liabilities, Unrealized gain on securities |  | (806)
Deferred Tax Liabilities, Prepaid expenses | (312) | (240)
Deferred Tax Liabilities, Business combination adjustments | (367) | (428)
Deferred Tax Liabilities, Other | (29) | (13)
Deferred Tax Liabilities, Gross, Total | (2,500) | (3,144)
Deferred tax asset, net | $ 4,286 | $ 1,821

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