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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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