Derivatives and Hedging Activities (Designated as Hedging Instruments, Notional Values, Contractual Amounts and Fair Value) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 72,573,000	$ 55,197,000		$ 46,467,000
Derivative Liability, Fair Value	65,447,000	55,439,000		55,106,000
Commercial Loan Swaps (FRAPS) | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0		5,389,000
Derivative Asset, Fair Value	0	0	[1]	1,000	[1]
Derivative Liability, Notional/Contract Amount	89,591,000	93,313,000		117,543,000
Derivative Liability, Fair Value	6,063,000	6,683,000		10,392,000
Sub Debt Swap | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000,000	250,000,000		0
Derivative Asset, Fair Value	12,688,000	5,256,000	[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	250,000,000	250,000,000		5,389,000
Derivative Asset, Fair Value	12,688,000	5,256,000	[1]	1,000	[1]
Derivative Liability, Notional/Contract Amount	89,591,000	93,313,000		117,543,000
Derivative Liability, Fair Value	6,063,000	6,683,000		10,392,000
Level 2
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	72,573,000	55,197,000		46,467,000
Derivative Liability, Fair Value	65,447,000	55,439,000		55,106,000
Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	12,688,000	5,256,000		1,000
Derivative Liability, Fair Value	$ 6,063,000	$ 6,683,000		$ 10,392,000

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