Derivatives and Hedging Activities (Designated as Hedging Instruments, Notional Values, Contractual Amounts and Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014		Jun. 30, 2014
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 48,073	$ 55,197		$ 50,550
Derivative Liability, Fair Value	51,497	55,439		57,544
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	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	75,794	93,313		102,828
Derivative Liability, Fair Value	5,104	6,683		8,989
Sub Debt Swap | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000	250,000		0
Derivative Asset, Fair Value	1,153	5,256	[1]	0	[1]
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		0
Derivative Asset, Fair Value	1,153	5,256	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	75,794	93,313		102,828
Derivative Liability, Fair Value	5,104	6,683		8,989
Level 2
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	48,073	55,197		50,550
Derivative Liability, Fair Value	51,497	55,439		57,544
Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	1,153	5,256		0
Derivative Liability, Fair Value	$ 5,104	$ 6,683		$ 8,989

[1] (1) Included in "Other assets" on the Consolidated Balance Sheets(2) Included in "Other liabilities" on the Consolidated Balance Sheets