Investment Securities Schedule of Unrealized Loss on Investments (Details) $ in Thousands	Sep. 30, 2017 USD ($) Securities	Dec. 31, 2016 USD ($) Securities
Investment Securities
Less than 12 Months, Number of Securities | Securities	35
Less than 12 Months, Number of Securities | Securities		83
Less than 12 Months, Fair Value	$ 18,322
Less than 12 Months, Fair Value		$ 43,946
Less than 12 Months, Gross Unrealized Losses	$ (156)
Less than 12 Months, Gross Unrealized Losses		$ (1,147)
12 Months and over, Number of Securities | Securities	33	8
12 Months and over, Fair Value	$ 16,393	$ 3,143
12 Months and over, Gross Unrealized Losses	$ (435)	$ (97)
Total, Number of Securities | Securities	68
Total, Number of Securities | Securities		91
Total, Fair Value	$ 34,715
Total, Fair Value		$ 47,089
Total, Gross Unrealized Losses	$ (591)
Total, Gross Unrealized Losses		$ (1,244)
US Government-sponsored enterprises [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	8
Less than 12 Months, Number of Securities | Securities		13
Less than 12 Months, Fair Value	$ 4,855
Less than 12 Months, Fair Value		$ 8,351
Less than 12 Months, Gross Unrealized Losses	$ (47)
Less than 12 Months, Gross Unrealized Losses		$ (180)
12 Months and over, Number of Securities | Securities	8	3
12 Months and over, Fair Value	$ 3,801	$ 1,172
12 Months and over, Gross Unrealized Losses	$ (97)	$ (16)
Total, Number of Securities | Securities	16
Total, Number of Securities | Securities		16
Total, Fair Value	$ 8,656
Total, Fair Value		$ 9,523
Total, Gross Unrealized Losses	$ (144)
Total, Gross Unrealized Losses		$ (196)
Agency mortgage-backed [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	11	22
Less than 12 Months, Fair Value	$ 6,448	$ 15,141
Less than 12 Months, Gross Unrealized Losses	$ (43)	$ (261)
12 Months and over, Number of Securities | Securities	6	1
12 Months and over, Fair Value	$ 4,332	$ 344
12 Months and over, Gross Unrealized Losses	$ (83)	$ (8)
Total, Number of Securities | Securities	17	23
Total, Fair Value	$ 10,780	$ 15,485
Total, Gross Unrealized Losses	$ (126)	$ (269)
State and political subdivisions [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	15	40
Less than 12 Months, Fair Value	$ 6,541	$ 16,481
Less than 12 Months, Gross Unrealized Losses	$ (44)	$ (650)
12 Months and over, Number of Securities | Securities	15	0
12 Months and over, Fair Value	$ 6,312	$ 0
12 Months and over, Gross Unrealized Losses	$ (205)	$ 0
Total, Number of Securities | Securities	30	40
Total, Fair Value	$ 12,853	$ 16,481
Total, Gross Unrealized Losses	$ (249)	$ (650)
Corporate [Member]
Investment Securities
Less than 12 Months, Number of Securities | Securities	1	8
Less than 12 Months, Fair Value	$ 478	$ 3,973
Less than 12 Months, Gross Unrealized Losses	$ (22)	$ (56)
12 Months and over, Number of Securities | Securities	4	4
12 Months and over, Fair Value	$ 1,948	$ 1,627
12 Months and over, Gross Unrealized Losses	$ (50)	$ (73)
Total, Number of Securities | Securities	5	12
Total, Fair Value	$ 2,426	$ 5,600
Total, Gross Unrealized Losses	$ (72)	$ (129)