Investment Securities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Less than 12 months	$ 97,903	$ 93,280
12 months or more	114,099	114,649
Total	212,002	207,929
Unrealized Losses
Less than 12 months	(1,908)	(785)
12 months or more	(4,064)	(2,537)
Total	(5,972)	(3,322)
U.S. Treasury
Fair Value
Less than 12 months	1,930	1,967
12 months or more	0	0
Total	1,930	1,967
Unrealized Losses
Less than 12 months	(53)	(13)
12 months or more	0	0
Total	(53)	(13)
U.S. government and federal agency obligations
Fair Value
Less than 12 months	0	0
12 months or more	11,092	12,073
Total	11,092	12,073
Unrealized Losses
Less than 12 months	0	0
12 months or more	(351)	(268)
Total	(351)	(268)
Government sponsored enterprises
Fair Value
Less than 12 months	17,776	16,471
12 months or more	25,333	20,426
Total	43,109	36,897
Unrealized Losses
Less than 12 months	(260)	(119)
12 months or more	(458)	(305)
Total	(718)	(424)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	22,974	22,013
12 months or more	12,371	12,570
Total	35,345	34,583
Unrealized Losses
Less than 12 months	(228)	(165)
12 months or more	(405)	(312)
Total	(633)	(477)
Residential - government agencies
Fair Value
Less than 12 months	55,223	52,829
12 months or more	65,303	69,580
Total	120,526	122,409
Unrealized Losses
Less than 12 months	(1,367)	(488)
12 months or more	(2,850)	(1,652)
Total	$ (4,217)	$ (2,140)