Derivatives and Hedging Activities - Derivatives in Fair Value Hedging Relationships (Details 3) - Fair value hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effect of fair value hedging derivative financial instruments on the consolidated statement of operations
Amount of Gain (Loss) Recognized in Income on Derivative	$ (127)	$ 3,009	$ 737	$ 3,204
Amount of Gain (Loss) Recognized in Income on Hedged Item	1,638	(2,995)	1,628	(3,020)
Interest expense | Brokered CD's
Effect of fair value hedging derivative financial instruments on the consolidated statement of operations
Amount of Gain (Loss) Recognized in Income on Derivative	(389)	4,374	2,882	3,599
Amount of Gain (Loss) Recognized in Income on Hedged Item	1,945	(4,247)	(268)	(3,365)
Interest revenue | Corporate Bonds
Effect of fair value hedging derivative financial instruments on the consolidated statement of operations
Amount of Gain (Loss) Recognized in Income on Derivative	262	(1,365)	(2,145)	(395)
Amount of Gain (Loss) Recognized in Income on Hedged Item	$ (307)	$ 1,252	$ 1,896	$ 345