Securities - Securities with Unrealized Losses at Year End - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Held-to-maturity, Fair Value
Less Than 12 Months	$ 763	$ 17,072
12 Months or More	4,361	28,821
Total	5,124	45,893
Held-to-maturity, Unrealized Losses
Less Than 12 Months	(1)	(167)
12 Months or More	(49)	(864)
Total	(50)	(1,031)
Municipals - exempt from Federal tax
Held-to-maturity, Fair Value
Less Than 12 Months		9,920
12 Months or More	2,224	24,412
Total	2,224	34,332
Held-to-maturity, Unrealized Losses
Less Than 12 Months		(78)
12 Months or More	(41)	(785)
Total	(41)	(863)
Agency mortgage-backed securities
Held-to-maturity, Fair Value
Less Than 12 Months	763	7,152
12 Months or More	2,137	4,409
Total	2,900	11,561
Held-to-maturity, Unrealized Losses
Less Than 12 Months	(1)	(89)
12 Months or More	(8)	(79)
Total	$ (9)	$ (168)