Securities - Schedule of Securities with Gross Unrealized Loses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value
Less than 12 Months	$ 42,132	$ 27,562
12 Months or More	40,010	43,661
Total	82,142	71,223
Unrealized Loss
Less than 12 Months	(898)	(182)
12 Months or More	(1,546)	(1,073)
Total	(2,444)	(1,255)
U.S. Treasury and federal agency
Fair Value
Less than 12 Months	0	0
12 Months or More	4,427	4,472
Total	4,427	4,472
Unrealized Loss
Less than 12 Months	0	0
12 Months or More	(111)	(69)
Total	(111)	(69)
U.S. government sponsored entities and agencies
Fair Value
Less than 12 Months	4,866	3,447
12 Months or More	8,873	8,975
Total	13,739	12,422
Unrealized Loss
Less than 12 Months	(125)	(42)
12 Months or More	(262)	(170)
Total	(387)	(212)
U.S. agency mortgage-backed securities: residential
Fair Value
Less than 12 Months	13,565	9,659
12 Months or More	6,256	6,581
Total	19,821	16,240
Unrealized Loss
Less than 12 Months	(289)	(48)
12 Months or More	(206)	(105)
Total	(495)	(153)
U.S. agency collateralized mortgage obligations: residential
Fair Value
Less than 12 Months	1,935	954
12 Months or More	17,567	19,147
Total	19,502	20,101
Unrealized Loss
Less than 12 Months	(7)	(16)
12 Months or More	(897)	(692)
Total	(904)	(708)
State and political subdivisions
Fair Value
Less than 12 Months	18,824	10,510
12 Months or More	2,387	3,487
Total	21,211	13,997
Unrealized Loss
Less than 12 Months	(412)	(60)
12 Months or More	(68)	(36)
Total	(480)	(96)
Corporate debt securities
Fair Value
Less than 12 Months	2,942	2,992
12 Months or More	500	999
Total	3,442	3,991
Unrealized Loss
Less than 12 Months	(65)	(16)
12 Months or More	(2)	(1)
Total	$ (67)	$ (17)