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Acquisition of Delaware Bancshares, Inc. (Proforma) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Net interest income | $ 34,908 | $ 28,590 | $ 24,521
Non-interest Income | 6,911 | 5,179 | 4,699
Net income | $ 8,198 | $ 6,711 | $ 5,908
Earnings Per Share, Basic | $ 1.32 | $ 1.16 | $ 1.07
Earnings Per Share, Diluted | $ 1.31 | $ 1.15 | $ 1.07
Parent Company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net income | $ 8,198 | $ 6,711 | $ 5,908
Delaware Bancshares, Inc. [Member] | Pro Forma [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net interest income | 34,908 | 37,199 |
Non-interest Income | 6,911 | 6,487 |
Net income | $ 8,198 | $ 3,588 |
Earnings Per Share, Basic | $ 1.32 | $ 0.58 |
Earnings Per Share, Diluted | $ 1.31 | $ 0.58 |

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