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Proposed Acquisition of Delaware Bancshares, Inc. (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 10, 2016 | Dec. 31, 2015
Subsequent Event, Date |  | Mar. 10, 2016
Subsequent Event [Member] | Delaware Bancshares and NBDC Bank Proposed Acquisition [Member] |  |
Business Acquisition, Share Price | $ 16.68 |
Business Acquisition, shares exchanged | 0.6221 |
Business Combination, Contingent Consideration, Asset, Current | $ 615 |
Subsequent Event [Member] | Delaware Bancshares and NBDC Bank Proposed Acquisition [Member] | Maximum [Member] |  |
Percent of cash consideration | 25.00% |
Percent decline in market value resulting in possible termination | 20.00% |

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