Derivatives and Hedging Activity (Derivative Instruments Designated as Hedging Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$ 58,107	$ 55,197
Derivative Liability, Fair Value, Gross Liability	52,745	55,439
Designated as Hedging Instrument | Commercial Loan Swaps (FRAPS)
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	55,689	93,313
Derivative Liability, Fair Value, Gross Liability	3,536	6,683
Designated as Hedging Instrument | Sub Debt Swap
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000	250,000
Derivative Asset, Fair Value	8,739	5,256
Derivative Liability, Notional/Contract Amount	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Designated as Hedging Instrument | Fair value hedges
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000	250,000
Derivative Asset, Fair Value	8,739	5,256
Derivative Liability, Notional/Contract Amount	55,689	93,313
Derivative Liability, Fair Value, Gross Liability	$ 3,536	$ 6,683