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Acquisition of Delaware Bancshares, Inc. (Tables) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | $ 12,150 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 111,079 | $ 100,998 | $ 99,041 | $ 91,864
Goodwill resulting from Delaware Bancshares, Inc. Merger |  | 11,331 | $ 9,715 |  |
Delaware Bancshares, Inc. Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquiree shares settled for stock | 694,114 |  |  |  |
Business Acquisition, shares exchanged | 0.6221 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 431,605 |  |  |  |
Value assigned to acquirer common share, per share | $ 28.15 |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 12,150 |  |  |  |
Acquiree shares settled for cash | 231,385 |  |  |  |
Business Acquisition, Share Price | $ 16.68 |  |  |  |
Purchase price assigned to acquiree shares | $ 3,860 |  |  |  |
Cash in lieu of fractional shares | 6 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 19,357 |  |  |  |
Goodwill and intangible assets | (7,640) |  |  |  |
Tangible equity | 11,717 |  |  |  |
Adjustments to investments acquired to fair value | 219 |  |  |  |
Adjustments to interest rates on loans acquired to fair value | 1,486 |  |  |  |
Adjustments to general credit on loans acquired to fair value | (1,614) |  |  |  |
Adjustments to specific credit - non-amortizing on loans acquired to fair value | (260) |  |  |  |
Adjustments to specific credit - amortizing on loans acquired to fair value | (239) |  |  |  |
Adjustments to core deposit intangibles acquired to fair value | 449 |  |  |  |
Adjustments to deferred loan fees acquired to fair value | (296) |  |  |  |
Adjustments to premises and equipment acquired to fair value | 3,053 |  |  |  |
Adjustments to allowance for loan and lease losses acquired to fair value | 1,651 |  |  |  |
Adjustments to deferred tax assets acquired to fair value | (1,417) |  |  |  |
Adjustments to other assets acquired to fair value | (97) |  |  |  |
Adjustments to time deposits acquired to fair value | (252) |  |  |  |
Total purchase price | 16,016 |  |  |  |
Net Assets Acquired: Cash | 14,977 |  |  |  |
Net Assets Acquired: Securities available for sale | 208,488 |  |  |  |
Net Assets Acquired: Loans | 116,674 |  |  |  |
Net Assets Acquired: Premises & equipment, net | 7,292 |  |  |  |
Net assets acquired: Regulatory stock | 279 |  |  |  |
Net Assets Acquired: Accrued interest receivable | 1,626 |  |  |  |
Net assets acquired: Bank-owned life insurance | 14,762 |  |  |  |
Net Assets Acquired: Core deposit intangible | 449 |  |  |  |
Net Assets Acquired: Deferred tax assets | 3,034 |  |  |  |
Net Assets Acquired: Other assets | 3,282 |  |  |  |
Net Assets Acquired: Time deposits | (71,342) |  |  |  |
Net Assets Acquired: Deposits other than time deposits | (255,921) |  |  |  |
Net Assets Acquired: Borrowings | (21,232) |  |  |  |
Net Assets Acquired: Accrued interest payable | (95) |  |  |  |
Net Assets Acquired: Other liabilities | (7,873) |  |  |  |
Net Assets Acquired | 14,400 |  |  |  |
Goodwill resulting from Delaware Bancshares, Inc. Merger | $ 1,616 | $ 1,616 |  |  |

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