Securities - Schedule of Securities with Gross Unrealized Loses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value
Less than 12 Months	$ 27,562	$ 76,196
12 Months or More	43,892	9,554
Total	71,454	85,750
Unrealized Loss
Less than 12 Months	(182)	(1,219)
12 Months or More	(1,091)	(258)
Total	(1,273)	(1,477)
U.S. Treasury
Fair Value
Less than 12 Months	0	4,500
12 Months or More	4,472	0
Total	4,472	4,500
Unrealized Loss
Less than 12 Months	0	(50)
12 Months or More	(69)	0
Total	(69)	(50)
U.S. government sponsored entities and agencies
Fair Value
Less than 12 Months	3,447	8,998
12 Months or More	8,975	0
Total	12,422	8,998
Unrealized Loss
Less than 12 Months	(42)	(188)
12 Months or More	(170)	0
Total	(212)	(188)
U.S. agency mortgage-backed securities: residential
Fair Value
Less than 12 Months	9,659	23,279
12 Months or More	6,581	0
Total	16,240	23,279
Unrealized Loss
Less than 12 Months	(48)	(196)
12 Months or More	(105)	0
Total	(153)	(196)
U.S. agency collateralized mortgage obligations: residential
Fair Value
Less than 12 Months	954	13,568
12 Months or More	19,147	9,317
Total	20,101	22,885
Unrealized Loss
Less than 12 Months	(16)	(438)
12 Months or More	(692)	(246)
Total	(708)	(684)
State and political subdivision
Fair Value
Less than 12 Months	10,510	21,924
12 Months or More	3,487	0
Total	13,997	21,924
Unrealized Loss
Less than 12 Months	(60)	(262)
12 Months or More	(36)	0
Total	(96)	(262)
Corporate debt securities
Fair Value
Less than 12 Months	2,992	3,927
12 Months or More	999	0
Total	3,991	3,927
Unrealized Loss
Less than 12 Months	(16)	(85)
12 Months or More	(1)	0
Total	(17)	(85)
Equity securities
Fair Value
Less than 12 Months	0	0
12 Months or More	231	237
Total	231	237
Unrealized Loss
Less than 12 Months	0	0
12 Months or More	(18)	(12)
Total	$ (18)	$ (12)