Derivative Financial Instruments (Details) (USD $)	1 Months Ended			3 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended										3 Months Ended		9 Months Ended
	Feb. 28, 2010	Feb. 28, 2009 swap_agreement	Nov. 30, 2008	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Non-designated hedging instruments Risk Management Interest rate cap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Interest rate cap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Sep. 30, 2011 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Sep. 30, 2011 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Sep. 30, 2011 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Sep. 30, 2011 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Other Assets Interest rate cap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Other Assets Interest rate cap contracts	Sep. 30, 2012 Non-designated hedging instruments Risk Management Other Liabilities Interest rate cap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Other Liabilities Interest rate cap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Foreign exchange forward contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Foreign exchange forward contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Sep. 30, 2011 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Sep. 30, 2011 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Other Assets Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Other Assets Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Other Assets Foreign exchange forward contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Other Assets Foreign exchange forward contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Other Liabilities Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Other Liabilities Interest rate swap contracts	Sep. 30, 2012 Non-designated hedging instruments Client-Related Other Liabilities Foreign exchange forward contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Other Liabilities Foreign exchange forward contracts
Derivative [Line Items]
Unrealized Gain Derivative Instruments						$ 3,400,000
Derivative, Collateral, Right to Reclaim Cash						3,800,000	2,700,000
Amount Paid to Enter Into a Series of Interest Rate Caps	751,000		2,100,000
Number of Interest Rate Swaps Previously Held But Now Terminated		2
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax				44,000	132,000
Unrealized Gain on Derivatives to Be Reclassified in Future Periods							0
Summary of Derivative Instruments [Abstract]
Notional Amount								49,050,000	80,050,000													142,773,000	65,077,000	1,142,000	0
Asset Derivatives, Fair Value																		14,000	94,000											2,265,000	1,095,000	1,142,000	0
Liability Derivatives, Fair Value																				0	0													2,626,000	1,796,000	1,142,000	0
Amount of Gain or (Loss) Recognized in Operations on Derivative										$ (14,000)	$ (176,000)	$ (79,000)	$ (410,000)	$ 0	$ 44,000	$ 0	$ 132,000									$ (103,000)	$ (160,000)	$ (354,000)	$ (451,000)