Securities - Fair Value and Gross Unrealized Losses by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value
Total	$ 160,673	$ 197,475
Less than 12 Months	158,038	195,789
12 Months or More	2,635	1,686
Unrealized Loss
Total	2,690	4,130
Less than 12 Months	2,639	4,103
12 Months or More	51	27
Federal agencies and GSEs
Fair Value
Total	83,671	89,597
Less than 12 Months	83,671	89,597
12 Months or More	0	0
Unrealized Loss
Total	1,737	2,387
Less than 12 Months	1,737	2,387
12 Months or More	0	0
Mortgage-backed and CMOs
Fair Value
Total	60,908	57,762
Less than 12 Months	59,334	56,076
12 Months or More	1,574	1,686
Unrealized Loss
Total	689	938
Less than 12 Months	660	911
12 Months or More	29	27
State and municipal
Fair Value
Total	14,541	47,221
Less than 12 Months	13,480	47,221
12 Months or More	1,061	0
Unrealized Loss
Total	259	782
Less than 12 Months	237	782
12 Months or More	22	0
Corporate
Fair Value
Total	1,553	2,895
Less than 12 Months	1,553	2,895
12 Months or More	0	0
Unrealized Loss
Total	5	23
Less than 12 Months	5	23
12 Months or More	$ 0	$ 0