Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended					1 Months Ended
	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Citizens Financial Group [Member]	Mar. 31, 2009 Citizens Financial Group [Member]	Jan. 31, 2011 Monroe Bancorp [Member]	Dec. 31, 2011 Integra [Member]
Commitments And Contingencies [Line Items]
Sale leaseback transaction, number of units		4
Sale leaseback transaction, financial centers		88
Sale leaseback transaction, carrying value of properties sold		$ 163,600,000
Sale leaseback transaction, gain on sale		123,900,000
Sale leaseback transaction, cash proceeds net of selling costs		287,400,000
Sale leaseback transaction, deferred gain recognized		28,900,000
Sale leaseback transaction, gain recognized over lease term		119,500,000
Lease term, minimum, in years		5			1		1
Lease term, maximum, in years		24			10		5
Additional successive terms extendable at the option		4
Period of extendable lease term, in years		5
Base rent per year		25,400,000			2,200,000		300,000
Number of leased locations acquired						65	2	17
Acquisition of option exercisable, days		90
Rent expenses	2,000,000	33,700,000	31,400,000	29,700,000
Number of leased locations closed					24
Number of leased operations centers acquired							1
Number of leased ATM locations acquired							5
Number of retirement centers							3
Loan commitments		1,220,000,000	1,106,000,000
Fixed rate loan commitment		1,173,000,000
Floating rate loan commitment		47,000,000
Standby letters of credit		73,300,000	74,300,000
Loan commitments fixed interest rate, minimum		2.00%
Loan commitments fixed interest rate, maximum		21.00%
Allowance for unfunded loan commitments		4,800,000	3,800,000
Extended credit		24,200,000	25,700,000
Credit extensions with collateral		6,700,000	5,500,000
Amount accrued in anticipation of negotiating final settlement and full resolution of settlement of lawsuit	$ 2,000,000