Securities - Securities with Unrealized Losses at Year End - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale, Fair Value
Less Than 12 Months	$ 276,050	$ 12,491
12 Months or More	2,165	40,762
Total	278,215	53,253
Available-for-sale, Unrealized Losses
Less Than 12 Months	(2,316)	(27)
12 Months or More	(46)	(261)
Total	(2,362)	(288)
Agency mortgage-backed securities
Available-for-sale, Fair Value
Less Than 12 Months	241,067	12,491
12 Months or More	2,165	35,614
Total	243,232	48,105
Available-for-sale, Unrealized Losses
Less Than 12 Months	(2,258)	(27)
12 Months or More	(46)	(238)
Total	(2,304)	(265)
U.S. Treasury
Available-for-sale, Fair Value
Less Than 12 Months	30,003
Total	30,003
Available-for-sale, Unrealized Losses
Less Than 12 Months	(44)
Total	(44)
U.S. Government sponsored entities
Available-for-sale, Fair Value
Less Than 12 Months	4,980
Total	4,980
Available-for-sale, Unrealized Losses
Less Than 12 Months	(14)
Total	$ (14)
Corporate bonds
Available-for-sale, Fair Value
12 Months or More		5,148
Total		5,148
Available-for-sale, Unrealized Losses
12 Months or More		(23)
Total		$ (23)