Derivative And Hedging Activities Derivative Instruments Not Designated as Hedging Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Fair Value	$ 31,862		$ 42,980
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	145,037		102,225
Fair Value	1,440		416
Other Assets [Member] | Forward Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount			135,000
Fair Value			1,301
Other Assets [Member] | Purchased deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	111,163		115,953
Fair Value	6,943		7,328
Other Liabilities [Member] | Forward Commitments [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	247,000
Fair Value	(623)
Other Liabilities [Member] | Written deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	111,163		115,953
Fair Value	(6,943)		(7,328)
Trading Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,665,024		1,821,787
Fair Value	31,862		42,980
Receive Rate	1.62%	[1]	1.63%	[1]
Pay Rate	1.62%	[1]	1.63%	[1]
Maturity	3 years 5 months		3 years 9 months
Trading Assets [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	69,737		25,747
Fair Value	2,143		748
Trading Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,665,024		1,821,787
Fair Value	(34,071)		(45,815)
Receive Rate	1.62%	[1]	1.63%	[1]
Pay Rate	1.62%	[1]	1.63%	[1]
Maturity	3 years 5 months		3 years 9 months
Trading Liabilities [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	65,277		24,413
Fair Value	$ (1,932)		$ (655)

[1] (1)Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.