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Acquisition of Delaware Bancshares, Inc. (Proforma) (Details) - USD ($) $ / shares in Units, $ in Thousands | 5 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Net interest income |  | $ 28,590 | $ 24,521 | $ 24,560
Noninterest Income |  | 5,179 | 4,699 | 5,110
Net Income (Loss) Attributable to Parent |  | $ 6,711 | $ 5,908 | $ 7,657
Earnings Per Share, Basic |  | $ 1.74 | $ 1.60 | $ 2.10
Earnings Per Share, Diluted |  | $ 1.73 | $ 1.60 | $ 2.10
Parent Company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net Income (Loss) Attributable to Parent |  | $ 6,711 | $ 5,908 | $ 7,657
Delaware Bancshares, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net interest income | $ 3,900 |  |  |
Noninterest Income | 893 |  |  |
Net Income (Loss) Attributable to Parent | $ 750 |  |  |
Earnings Per Share, Basic | $ 0.18 |  |  |
Earnings Per Share, Diluted | $ 0.18 |  |  |
Delaware Bancshares, Inc. [Member] | Pro Forma [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net interest income |  | 37,199 | 33,787 |
Noninterest Income |  | 6,487 | 7,939 |
Net Income (Loss) Attributable to Parent |  | $ 3,588 | $ 6,944 |
Earnings Per Share, Basic |  | $ 0.87 | $ 1.69 |
Earnings Per Share, Diluted |  | $ 0.87 | $ 1.68 |

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