Derivatives And Hedging (Details) (USD $)			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Mortgage banking operations [Member]	Sep. 30, 2011 Mortgage banking operations [Member]	Sep. 30, 2012 Mortgage banking operations [Member]	Sep. 30, 2011 Mortgage banking operations [Member]	Sep. 30, 2012 Other noninterest income [Member]	Sep. 30, 2011 Other noninterest income [Member]	Sep. 30, 2012 Other noninterest income [Member]	Sep. 30, 2011 Other noninterest income [Member]	Sep. 30, 2012 Interest rate lock commitments [Member]	Dec. 31, 2011 Interest rate lock commitments [Member]	Sep. 30, 2012 Forward commitments [Member]	Dec. 31, 2011 Forward commitments [Member]	Sep. 30, 2012 Interest rate swaps - broker-dealer [Member]	Dec. 31, 2011 Interest rate swaps - broker-dealer [Member]	Sep. 30, 2012 Interest rate swaps - customer [Member]	Dec. 31, 2011 Interest rate swaps - customer [Member]
Derivative [Line Items]
Interest rate lock period			10 days	60 days
Residential mortgage loans held for sale	$ 279,600,000	$ 192,400,000
Notional													297,723,000	181,456,000	476,500,000	315,579,000	40,303,000	43,213,000	42,877,000	45,820,000
Fair Value Asset													20,452,000	5,558,000	0	0	0	0	2,392,000	4,711,000
Fair Value Liability													0	0	12,458,000	3,785,000	2,415,000	4,527,000	0	0
Gain (loss) recognized in income					$ (2,694,000)	$ (2,116,000)	$ (3,349,000)	$ (5,015,000)	$ 80,000	$ 1,191,000	$ (600,000)	$ 1,228,000