Investment Securities Schedule of Unrealized Loss on Investments (Details) $ in Thousands	Jun. 30, 2017 USD ($) Securities	Dec. 31, 2016 USD ($) Securities
Investment Securities
Less than 12 Months, Number of Securities | Securities	60
Less than 12 Months, Number of Securities | Securities		83
Less than 12 Months, Fair Value	$ 33,096
Less than 12 Months, Fair Value		$ 43,946
Less than 12 Months, Gross Unrealized Losses	$ (554)
Less than 12 Months, Gross Unrealized Losses		$ (1,147)
12 Months and over, Number of Securities | Securities	10	8
12 Months and over, Fair Value	$ 4,165	$ 3,143
12 Months and over, Gross Unrealized Losses	$ (60)	$ (97)
Total, Number of Securities | Securities	70
Total, Number of Securities | Securities		91
Total, Fair Value	$ 37,261
Total, Fair Value		$ 47,089
Total, Gross Unrealized Losses	$ (614)
Total, Gross Unrealized Losses		$ (1,244)
US Government-sponsored enterprises [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	11
Less than 12 Months, Number of Securities | Securities		13
Less than 12 Months, Fair Value	$ 6,812
Less than 12 Months, Fair Value		$ 8,351
Less than 12 Months, Gross Unrealized Losses	$ (132)
Less than 12 Months, Gross Unrealized Losses		$ (180)
12 Months and over, Number of Securities | Securities	5	3
12 Months and over, Fair Value	$ 1,937	$ 1,172
12 Months and over, Gross Unrealized Losses	$ (17)	$ (16)
Total, Number of Securities | Securities	16
Total, Number of Securities | Securities		16
Total, Fair Value	$ 8,749
Total, Fair Value		$ 9,523
Total, Gross Unrealized Losses	$ (149)
Total, Gross Unrealized Losses		$ (196)
Agency mortgage-backed [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	21	22
Less than 12 Months, Fair Value	$ 13,748	$ 15,141
Less than 12 Months, Gross Unrealized Losses	$ (155)	$ (261)
12 Months and over, Number of Securities | Securities	1	1
12 Months and over, Fair Value	$ 302	$ 344
12 Months and over, Gross Unrealized Losses	$ (4)	$ (8)
Total, Number of Securities | Securities	22	23
Total, Fair Value	$ 14,050	$ 15,485
Total, Gross Unrealized Losses	$ (159)	$ (269)
State and political subdivisions [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	25	40
Less than 12 Months, Fair Value	$ 11,150	$ 16,481
Less than 12 Months, Gross Unrealized Losses	$ (244)	$ (650)
12 Months and over, Number of Securities | Securities	1	0
12 Months and over, Fair Value	$ 457	$ 0
12 Months and over, Gross Unrealized Losses	$ (10)	$ 0
Total, Number of Securities | Securities	26	40
Total, Fair Value	$ 11,607	$ 16,481
Total, Gross Unrealized Losses	$ (254)	$ (650)
Corporate [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	3	8
Less than 12 Months, Fair Value	$ 1,386	$ 3,973
Less than 12 Months, Gross Unrealized Losses	$ (23)	$ (56)
12 Months and over, Number of Securities | Securities	3	4
12 Months and over, Fair Value	$ 1,469	$ 1,627
12 Months and over, Gross Unrealized Losses	$ (29)	$ (73)
Total, Number of Securities | Securities	6	12
Total, Fair Value	$ 2,855	$ 5,600
Total, Gross Unrealized Losses	$ (52)	$ (129)