Securities - Fair Value and Gross Unrealized Losses by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value
Total	$ 158,288	$ 197,475
Less than 12 Months	156,702	195,789
12 Months or More	1,586	1,686
Unrealized Loss
Total	3,545	4,130
Less than 12 Months	3,517	4,103
12 Months or More	28	27
Federal agencies and GSEs
Fair Value
Total	81,734	89,597
Less than 12 Months	81,734	89,597
12 Months or More	0	0
Unrealized Loss
Total	2,208	2,387
Less than 12 Months	2,208	2,387
12 Months or More	0	0
Mortgage-backed and CMOs
Fair Value
Total	53,331	57,762
Less than 12 Months	51,745	56,076
12 Months or More	1,586	1,686
Unrealized Loss
Total	850	938
Less than 12 Months	822	911
12 Months or More	28	27
State and municipal
Fair Value
Total	21,665	47,221
Less than 12 Months	21,665	47,221
12 Months or More	0	0
Unrealized Loss
Total	478	782
Less than 12 Months	478	782
12 Months or More	0	0
Corporate
Fair Value
Total	1,558	2,895
Less than 12 Months	1,558	2,895
12 Months or More	0	0
Unrealized Loss
Total	9	23
Less than 12 Months	9	23
12 Months or More	$ 0	$ 0