Securities (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Security	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Security	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Security
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 146,637		$ 146,637
Gross unrealized gains	155		155
Gross unrealized loss	(3,811)		(3,811)
Fair value	142,981		142,981
Equity Securities, Available-for-sale [Abstract]
Amortized cost					$ 100
Gross unrealized gains					97
Gross unrealized loss					0
Fair value					197
Amortized cost and fair value of securities available-for-sale [Abstract]
Amortized cost					158,192
Gross unrealized gains					808
Gross unrealized losses					(1,879)
Fair value	142,981		142,981		157,121
Available-for-sale securities, realized gains (losses) [Abstract]
Realized gains on sales of securities	51	$ 87	131	$ 87
Realized losses on sales of securities	(11)	0	(11)	0
Net realized gain	40	$ 87	120	$ 87
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	529		529		112
More Than Twelve Months	3,282		3,282		1,767
Gross Unrealized Losses	3,811		3,811		1,879
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	40,401		40,401		25,170
More Than Twelve Months	78,383		78,383		79,434
Total	$ 118,784		$ 118,784		$ 104,604
Unrealized loss position, Number of securities | Security	103		103		77
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 6,844		$ 6,844
Gross unrealized gains	0		0
Gross unrealized loss	(26)		(26)
Fair value	6,818		6,818
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	26		26
More Than Twelve Months	0		0
Gross Unrealized Losses	26		26
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	6,818		6,818
More Than Twelve Months	0		0
Total	6,818		6,818
Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	11,519		11,519		$ 9,530
Gross unrealized gains	0		0		27
Gross unrealized loss	(160)		(160)		(122)
Fair value	11,359		11,359		9,435
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	37		37		11
More Than Twelve Months	123		123		111
Gross Unrealized Losses	160		160		122
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	7,678		7,678		3,189
More Than Twelve Months	3,481		3,481		3,089
Total	11,159		11,159		6,278
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	51,846		51,846		64,413
Gross unrealized gains	111		111		489
Gross unrealized loss	(716)		(716)		(137)
Fair value	51,241		51,241		64,765
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	332		332		32
More Than Twelve Months	384		384		105
Gross Unrealized Losses	716		716		137
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	20,739		20,739		11,141
More Than Twelve Months	10,625		10,625		10,999
Total	31,364		31,364		22,140
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	71,152		71,152		75,906
Gross unrealized gains	0		0		0
Gross unrealized loss	(2,893)		(2,893)		(1,610)
Fair value	68,259		68,259		74,296
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	130		130		67
More Than Twelve Months	2,763		2,763		1,543
Gross Unrealized Losses	2,893		2,893		1,610
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	4,170		4,170		9,742
More Than Twelve Months	64,089		64,089		64,554
Total	68,259		68,259		74,296
Money Market Investments [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,326		1,326		1,194
Gross unrealized gains	0		0		0
Gross unrealized loss	0		0		0
Fair value	1,326		1,326		1,194
Corporate Bond and Other Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	3,950		3,950		7,049
Gross unrealized gains	44		44		195
Gross unrealized loss	(16)		(16)		(10)
Fair value	3,978		3,978		7,234
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	4		4		2
More Than Twelve Months	12		12		8
Gross Unrealized Losses	16		16		10
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	996		996		1,098
More Than Twelve Months	188		188		792
Total	$ 1,184		$ 1,184		$ 1,890