Securities - Schedule of Securities with Gross Unrealized Loses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Less than 12 Months	$ 43,543	$ 27,562
12 Months or More	39,827	43,661
Total	83,370	71,223
Unrealized Loss
Less than 12 Months	(1,051)	(182)
12 Months or More	(1,699)	(1,073)
Total	(2,750)	(1,255)
U.S. Treasury and federal agency
Fair Value
Less than 12 Months	0	0
12 Months or More	4,411	4,472
Total	4,411	4,472
Unrealized Loss
Less than 12 Months	0	0
12 Months or More	(125)	(69)
Total	(125)	(69)
U.S. government sponsored entities and agencies
Fair Value
Less than 12 Months	5,838	3,447
12 Months or More	8,840	8,975
Total	14,678	12,422
Unrealized Loss
Less than 12 Months	(154)	(42)
12 Months or More	(283)	(170)
Total	(437)	(212)
U.S. agency mortgage-backed securities: residential
Fair Value
Less than 12 Months	16,542	9,659
12 Months or More	6,002	6,581
Total	22,544	16,240
Unrealized Loss
Less than 12 Months	(455)	(48)
12 Months or More	(237)	(105)
Total	(692)	(153)
U.S. agency collateralized mortgage obligations: residential
Fair Value
Less than 12 Months	1,700	954
12 Months or More	16,724	19,147
Total	18,424	20,101
Unrealized Loss
Less than 12 Months	(6)	(16)
12 Months or More	(940)	(692)
Total	(946)	(708)
State and political subdivisions
Fair Value
Less than 12 Months	16,528	10,510
12 Months or More	3,364	3,487
Total	19,892	13,997
Unrealized Loss
Less than 12 Months	(367)	(60)
12 Months or More	(97)	(36)
Total	(464)	(96)
Corporate debt securities
Fair Value
Less than 12 Months	2,935	2,992
12 Months or More	486	999
Total	3,421	3,991
Unrealized Loss
Less than 12 Months	(69)	(16)
12 Months or More	(17)	(1)
Total	$ (86)	$ (17)