Securities - Securities with Unrealized Losses at Year End - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Held-to-maturity, Fair Value
Less Than 12 Months	$ 17,072	$ 6,753
12 Months or More	28,821	47,841
Total	45,893	54,594
Held-to-maturity, Unrealized Losses
Less Than 12 Months	(167)	(45)
12 Months or More	(864)	(1,419)
Total	(1,031)	(1,464)
Municipals - tax exempt
Held-to-maturity, Fair Value
Less Than 12 Months	9,920	1,884
12 Months or More	24,412	42,867
Total	34,332	44,751
Held-to-maturity, Unrealized Losses
Less Than 12 Months	(78)	(16)
12 Months or More	(785)	(1,330)
Total	(863)	(1,346)
Agency mortgage-backed securities
Held-to-maturity, Fair Value
Less Than 12 Months	7,152	4,869
12 Months or More	4,409	4,974
Total	11,561	9,843
Held-to-maturity, Unrealized Losses
Less Than 12 Months	(89)	(29)
12 Months or More	(79)	(89)
Total	$ (168)	$ (118)