Derivatives And Hedging (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Residential mortgage loans held for sale	$ 269,600,000		$ 419,100,000
Derivative Asset, Fair Value	1,790,000		2,148,000
Derivative Asset, Fair Value, Gross Asset	1,790,000		2,148,000
Derivative Liability, Fair Value, Gross Liability	1,827,000		2,144,000
Servicing Fees, Net	2,661,000	2,380,000
Minimum [Member]
Derivative [Line Items]
Interest rate lock period	10 days
Maximum [Member]
Derivative [Line Items]
Interest rate lock period	60 days
Interest rate lock commitments [Member]
Derivative [Line Items]
Notional	263,446,000		242,061,000
Derivative Asset, Fair Value	7,517,000		9,035,000
Derivative Liability, Fair Value, Net	0		0
Forward commitments [Member]
Derivative [Line Items]
Notional	413,000,000		531,000,000
Derivative Asset, Fair Value	0		0
Derivative Liability, Fair Value, Net	2,522,000		1,881,000
Interest Rate Swaps, Broker-Dealer [Member]
Derivative [Line Items]
Notional	28,810,000		44,846,000
Derivative Asset, Fair Value	0		0
Derivative Liability, Fair Value, Gross Liability	1,827,000		2,144,000
Interest Rate Swaps, Customer [Member]
Derivative [Line Items]
Notional	29,856,000		36,158,000
Derivative Asset, Fair Value, Gross Asset	1,790,000		2,148,000
Derivative Liability, Fair Value, Net	0		0
Mortgage Banking Operations [Member]
Derivative [Line Items]
Gain (loss) recognized in income	(10,168,000)	(2,362,000)
Other Miscellaneous Noninterest Income [Member]
Derivative [Line Items]
Gain (loss) recognized in income	$ 76,000	$ (612,000)