Derivative Financial Instruments (Details) (USD $)	1 Months Ended			12 Months Ended				12 Months Ended												12 Months Ended
	Feb. 28, 2010	Feb. 28, 2009 swap_agreement	Nov. 30, 2008	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012 Non-designated hedging instruments Risk Management Interest rate cap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Interest rate cap contracts	Dec. 31, 2012 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Dec. 31, 2010 Non-designated hedging instruments Risk Management Gain on state tax credits, net Interest rate cap contracts	Dec. 31, 2012 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Dec. 31, 2010 Non-designated hedging instruments Risk Management Miscellaneous income Interest rate swap contracts	Dec. 31, 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	Dec. 31, 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	Dec. 31, 2012 Non-designated hedging instruments Client-Related Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Interest rate swap contracts	Dec. 31, 2012 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Dec. 31, 2011 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Dec. 31, 2010 Non-designated hedging instruments Client-Related Interest and fees on loans Interest rate swap contracts	Dec. 31, 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	Dec. 31, 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
Derivative [Line Items]
Unrealized Gain Derivative Instruments					$ 1,700,000
Derivative, Collateral, Right to Reclaim Cash				2,700,000	3,300,000
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				162,000
Unrealized Gain on Derivatives to Be Reclassified in Future Periods				0	0
Summary of Derivative Instruments [Abstract]
Notional Amount						49,050,000	80,050,000											126,962,000	65,077,000
Asset Derivatives, Fair Value														13,000	94,000								1,741,000	1,095,000
Liability Derivatives, Fair Value																0	0								1,979,000	1,796,000
Amount of Gain or (Loss) Recognized in Operations on Derivative								$ (80,000)	$ (435,000)	$ (1,340,000)	$ 0	$ 162,000	$ 242,000							$ (447,000)	$ (620,000)	$ (594,000)