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Acquisition of New Windsor Bancorp, Inc. - Narrative (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2017 USD ($) director $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Merger expenses |  | $ 208 | $ 0 | $ 370 | $ 0 |
New Windsor |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pro forma total assets |  | 1,600,000 |  | 1,600,000 |  |
Pro forma total deposits |  | 1,300,000 |  | 1,300,000 |  |
Pro forma loans |  | 1,200,000 |  | 1,200,000 |  |
Merger expenses |  | $ 208 |  | 370 |  | $ 472
Merger-related expenses |  |  |  | $ 170 |  |
Subsequent Event | New Windsor |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash each shareholder may receive per share (in dollars per share) | $ / shares | $ 30.00 |  |  |  |  |
Percent of consideration paid as cash | 15.00% |  |  |  |  |
Cash paid in merger | $ 4,520 |  |  |  |  |
Number of directors joining boards | director | 2 |  |  |  |  |
Subsequent Event | New Windsor | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares each shareholder may receive (in shares) | shares | 1.10 |  |  |  |  |
Percent of consideration paid as common stock | 85.00% |  |  |  |  |
Shares of common stock issued in merger (in shares) | shares | 950,000 |  |  |  |  |

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