Securities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Security	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Security	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Security
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 146,962		$ 146,962
Gross unrealized gains	60		60
Gross unrealized loss	(4,734)		(4,734)
Fair value	142,288		142,288
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	142,288		142,288		157,121
Available-for-sale securities, realized gains (losses) [Abstract]
Realized gains on sales of securities	0	$ 2	131	$ 89
Realized losses on sales of securities	0	0	(11)	0
Net realized gain	0	$ 2	120	$ 89
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	615		615		112
More Than Twelve Months	4,119		4,119		1,767
Gross Unrealized Losses	4,734		4,734		1,879
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	49,905		49,905		25,170
More Than Twelve Months	83,416		83,416		79,434
Total	$ 133,321		$ 133,321		$ 104,604
Unrealized loss position, Number of securities | Security	127		127		77
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 9,338		$ 9,338
Gross unrealized gains	0		0
Gross unrealized loss	(74)		(74)
Fair value	9,264		9,264
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	74		74
More Than Twelve Months	0		0
Gross Unrealized Losses	74		74
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	9,264		9,264
More Than Twelve Months	0		0
Total	9,264		9,264
Obligations of U.S. Government Agencies [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	11,278		11,278		$ 9,530
Gross unrealized gains	0		0		27
Gross unrealized loss	(240)		(240)		(122)
Fair value	11,038		11,038		9,435
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	59		59		11
More Than Twelve Months	181		181		111
Gross Unrealized Losses	240		240		122
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	7,302		7,302		3,189
More Than Twelve Months	3,736		3,736		3,089
Total	11,038		11,038		6,278
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	50,101		50,101		64,413
Gross unrealized gains	50		50		489
Gross unrealized loss	(1,121)		(1,121)		(137)
Fair value	49,030		49,030		64,765
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	441		441		32
More Than Twelve Months	680		680		105
Gross Unrealized Losses	1,121		1,121		137
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	28,333		28,333		11,141
More Than Twelve Months	13,945		13,945		10,999
Total	42,278		42,278		22,140
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	71,090		71,090		75,906
Gross unrealized gains	0		0		0
Gross unrealized loss	(3,280)		(3,280)		(1,610)
Fair value	67,810		67,810		74,296
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	35		35		67
More Than Twelve Months	3,245		3,245		1,543
Gross Unrealized Losses	3,280		3,280		1,610
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	2,362		2,362		9,742
More Than Twelve Months	65,448		65,448		64,554
Total	67,810		67,810		74,296
Money Market Investments [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,205		1,205		1,194
Gross unrealized gains	0		0		0
Gross unrealized loss	0		0		0
Fair value	1,205		1,205		1,194
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	3,950		3,950		7,049
Gross unrealized gains	10		10		195
Gross unrealized loss	(19)		(19)		(10)
Fair value	3,941		3,941		7,234
Securities Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than Twelve Months	6		6		2
More Than Twelve Months	13		13		8
Gross Unrealized Losses	19		19		10
Securities Available-for-Sale, Fair Value [Abstract]
Less than Twelve Months	2,644		2,644		1,098
More Than Twelve Months	287		287		792
Total	$ 2,931		$ 2,931		$ 1,890