Derivatives and Hedging Activities (Designated as Hedging Instruments, Notional Values, Contractual Amounts and Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 117,842	$ 58,107	$ 48,073
Derivative Liability, Fair Value	90,622	52,745	51,497
Commercial Loan Swaps (FRAPS) | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0	0
Derivative Asset, Fair Value	0	0	0
Derivative Liability, Notional/Contract Amount	50,668	55,689	75,794
Derivative Liability, Fair Value	2,772	3,536	5,104
Sub Debt Swap | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000	250,000	250,000
Derivative Asset, Fair Value	29,760	8,739	1,153
Derivative Liability, Notional/Contract Amount	0	0	0
Derivative Liability, Fair Value	0	0	0
Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000	250,000	250,000	$ 250,000
Derivative Asset, Fair Value	29,760	8,739	1,153
Derivative Liability, Notional/Contract Amount	50,668	55,689	75,794
Derivative Liability, Fair Value	2,772	3,536	5,104
Level 2
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	117,842	58,107	48,073
Derivative Liability, Fair Value	90,622	52,745	51,497
Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	29,760	8,739	1,153
Derivative Liability, Fair Value	$ 2,772	$ 3,536	$ 5,104