Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivatives, Fair Value [Line Items]
Lease expiration date	through 2058.
Net rental expense	$ 19,200,000	$ 19,100,000	$ 17,600,000
Net of rental income	1,800,000	2,100,000	2,300,000
Aggregate fair value of net liability position	21,000,000
Collateral posted with counterparties	18,300,000
Total interest rate swaps aggregate notional amount	66,100,000
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional amount of interest rate derivatives	300,000,000
Gain (loss) on cash flow hedge ineffectiveness	32,000
Recognized net reduction to interest expense	472,000
Accumulated net after-tax loss related to effective cash flow hedges	13,100,000	708,000
Estimated amount of interest rate derivatives to be reclassified to interest expense	6,600,000
Interest Rate Caps [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on cash flow hedge ineffectiveness	(23,000)	(205,000)
Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Swaps Starting July 12 2012 [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fixed interest rate	5.11%
Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Swaps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional amount of interest rate derivatives	8,900,000
Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Minimum [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Strike rates	6.00%
Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Strike rates	6.25%
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Swaps Due July 15, 2015 [Member]
Derivatives, Fair Value [Line Items]
Aggregate notional amount of interest rate derivatives	100,000,000
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Swaps Due May 1, 2013 [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Aggregate notional amount of interest rate derivatives	100,000,000
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Maturity date, derivative instrument	May 01, 2013
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Minimum [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Strike rates	2.50%
Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Strike rates	2.75%
Prime-Rate-Indexed Deposits, Consisting Of Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Caps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Maturity date, derivative instrument	Jul. 15, 2015
Fixed Rate At Approximately 5.11% [Member] | Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Swaps Starting July 12 2012 [Member]
Derivatives, Fair Value [Line Items]
Aggregate notional amount of interest rate derivatives	100,000,000
Fixed Rate At Approximately 5.11% [Member] | Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Swaps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Maturity date, derivative instrument	Jul. 01, 2017
Fixed-Rate At Approximately 4.73% [Member] | Consumer And Commercial Money Market Deposit Accounts [Member] | Interest Rate Swaps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Aggregate notional amount of interest rate derivatives	200,000,000
Maturity date, derivative instrument	Oct. 01, 2016
Fixed interest rate	4.73%
Interest rate swap, starting date	July 2012
Fixed-Rate At Approximately 4.73% [Member] | Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] | Interest Rate Swaps [Member] | Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional amount of interest rate derivatives	$ 51,000,000