Derivative Financial Instruments (Details) (USD $)	1 Months Ended						3 Months Ended								3 Months Ended
	Feb. 28, 2010	Nov. 30, 2008	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Non-designated hedging instruments Risk Management Interest rate cap contracts	Dec. 31, 2012 Non-designated hedging instruments Risk Management Interest rate cap contracts	Mar. 31, 2013 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Mar. 31, 2012 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Mar. 31, 2013 Non-designated hedging instruments Risk Management Other Assets Interest rate cap contracts	Dec. 31, 2012 Non-designated hedging instruments Risk Management Other Assets Interest rate cap contracts	Mar. 31, 2013 Non-designated hedging instruments Risk Management Other Liabilities Interest rate cap contracts	Dec. 31, 2012 Non-designated hedging instruments Risk Management Other Liabilities Interest rate cap contracts	Mar. 31, 2013 Non-designated hedging instruments Client-Related Interest rate swap contracts	Dec. 31, 2012 Non-designated hedging instruments Client-Related Interest rate swap contracts	Mar. 31, 2013 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Mar. 31, 2012 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Mar. 31, 2013 Non-designated hedging instruments Client-Related Other Assets Interest rate swap contracts	Dec. 31, 2012 Non-designated hedging instruments Client-Related Other Assets Interest rate swap contracts	Mar. 31, 2013 Non-designated hedging instruments Client-Related Other Liabilities Interest rate swap contracts	Dec. 31, 2012 Non-designated hedging instruments Client-Related Other Liabilities Interest rate swap contracts
Derivative [Line Items]
Unrealized Gain Derivative Instruments			$ 1,600,000
Derivative, Collateral, Right to Reclaim Cash			3,100,000	3,300,000
Amount Paid to Enter Into a Series of Interest Rate Caps	751,000	2,100,000
Summary of Derivative Instruments [Abstract]
Notional Amount					34,050,000	49,050,000							121,143,000	126,962,000
Asset Derivatives, Fair Value									12,000	13,000							1,610,000	1,741,000
Liability Derivatives, Fair Value											0	0							1,721,000	1,979,000
Amount of Gain or (Loss) Recognized in Operations on Derivative							$ (1,000)	$ (26,000)							$ (105,000)	$ (141,000)