Acquisition (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Share price (usd per share) | $ / shares	$ 19.00
Assets	$ 1,288,791	$ 1,295,638
Interest-bearing demand deposits	4,781	4,227
Liabilities	1,140,207	1,145,367
Deposits	$ 1,123,463	$ 1,085,821
Columbus First Bancorp, Inc. [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity interest exchange ratio	2
Common stock of acquiree (usd per share) | $ / shares	$ 38.00
Business combination, consideration transferred	$ 0
Common stock, shares, outstanding (in shares) | shares	1,589,516
Options outstanding (in shares) | shares	65,724
Exercisable at end of period (in dollars per share) | $ / shares	$ 14.06
Assets	$ 324,100
Loans Receivable, Net	276,900
Interest-bearing demand deposits	31,100
Liabilities	290,700
Deposits	$ 253,700