Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Apr. 01, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017
Consideration paid: [Abstract]
Cash	$ 3,164		$ 3,164	$ 0
Company common stock	3,957		3,957	0
Total purchase price	$ 7,121
Identifiable assets acquired:
Cash and cash equivalents					$ 2,304
Securities available for sale					1,959
Restricted securities, at cost					278
Loans, net					42,790
Premises and equipment					1,520
Other real estate owned					226
Core deposit intangibles					440
Other assets					929
Total assets					50,446
Identifiable liabilities assumed:
Deposits					44,000
Other liabilities					324
Total liabilities					44,324
Net assets acquired					6,122
Preliminary goodwill		$ 1,620	1,620		999	$ 621
Amortization and Accretion of Premiums and Discounts [Abstract]
Net impact to income before taxes			$ (121)	$ 0
Fair Value Adjustment [Member]
Identifiable assets acquired:
Cash and cash equivalents					0
Securities available for sale					0
Restricted securities, at cost					0
Loans, net					(34)
Premises and equipment					450
Other real estate owned					(11)
Core deposit intangibles					440
Other assets					(126)
Total assets					719
Identifiable liabilities assumed:
Deposits					246
Other liabilities					0
Total liabilities					$ 246
Citizens National Bank [Member]
Business Combination, Description [Abstract]
Shares issued per acquired share (in shares)	0.1041
Cash paid per acquired share (in dollars per share)					$ 2.19
Shares issued for acquisition (in shares)	149,625
Consideration paid: [Abstract]
Total purchase price	$ 7,100
Identifiable assets acquired:
Cash and cash equivalents					$ 2,304
Securities available for sale					1,959
Restricted securities, at cost					278
Loans, net					42,824
Premises and equipment					1,070
Other real estate owned					237
Core deposit intangibles					0
Other assets					1,055
Total assets					49,727
Identifiable liabilities assumed:
Deposits					43,754
Other liabilities					324
Total liabilities					44,078
Amortization and Accretion of Premiums and Discounts [Abstract]
Acquired performing loans		92
Acquired impaired loans		1
Certificate of deposit valuation		39
Amortization of core deposit intangible		(11)
Net impact to income before taxes		$ 121
Citizens National Bank [Member] | Acquired Performing Loans [Member]
Acquired Impaired Loans Receivable [Abstract]
Fair value of loans acquired impaired loans					42,100
Citizens National Bank [Member] | Acquired Impaired Loans [Member]
Acquired Impaired Loans Receivable [Abstract]
Contractually required principal and interest payments					1,031
Nonaccretable difference					(211)
Cash flows expected to be collected					820
Accretable difference					(110)
Fair value of loans acquired impaired loans					$ 710