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Business Combinations (Details) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 01, 2017 | Dec. 31, 2016 | Mar. 31, 2018
United Financial |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate transaction consideration |  | $ 0 |
Aggregate cash consideration |  | 0 |
TriSummit Bancorp |  |  |
Business Acquisition [Line Items] |  |  |
Merger expenses |  | 220,000 |
Merger expenses estimated in the future |  | $ 5,300,000 |
TriSummit Bancorp | Subsequent Event |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate transaction consideration | $ 36,127,000 |  |
Aggregate cash consideration | $ 16,083,000 |  |
Business Combination, Number Of Shares Converted, Net Of Cancellations | 86,185 |  |
Shares issued for acquisition | 765,277 |  |
TriSummit Bancorp | Subsequent Event | Common Stock |  |  |
Business Acquisition [Line Items] |  |  |
Right to receive cash (in dollars per share) | $ 4.40 |  |
Number of securities called by each share of TriSummit (in shares) | 0.2099 |  |
TriSummit Bancorp | Subsequent Event | Series A Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Right to receive cash (in dollars per share) | $ 4.40 |  |
Number of securities called by each share of TriSummit (in shares) | 0.2099 |  |
TriSummit Bancorp | TriSummit Bancorp | Subsequent Event |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of outstanding options canceled | 50.00% |  |
TriSummit Bancorp | TriSummit Bancorp | Subsequent Event | Series B, C, and D TARP Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Value of redeemed preferred stock | $ 7,140,000 |  |
Scenario, Forecast | United Financial |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash consideration |  |  | $ 225

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