Commitments And Contingencies (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Citizens Financial Group [Member]	Mar. 31, 2009 Citizens Financial Group [Member]	Sep. 30, 2011 Monroe Bancorp [Member]	Sep. 30, 2011 Integra [Member]
Sale leaseback transaction, number of units		4
Sale leaseback transaction, financial centers		88
Sale leaseback transaction, carrying value of properties sold	$ 163,600,000	$ 163,600,000
Sale leaseback transaction, gain on sale	123,900,000	123,900,000
Sale leaseback transaction, cash proceeds net of selling costs		287,400,000
Sale leaseback transaction, gain recognized over lease term		119,500,000
Sale leaseback transaction, deferred gain recognized	25,900,000	25,900,000
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	16
Acquisition of option exercisable, days	90
Rent expenses	1,100,000
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	1,196,000,000	1,196,000,000	1,106,000,000
Fixed rate loan commitment	1,007,000,000	1,007,000,000
Floating rate loan commitment	189,000,000	189,000,000
Standby letters of credit	80,600,000	80,600,000	74,300,000
Loan commitments fixed interest rate, minimum		2.00%
Loan commitments fixed interest rate, maximum		19.80%
Allowance for unfunded loan commitments		5,900,000	3,800,000
Extended credit	24,600,000	24,600,000	25,700,000
Credit extensions with collateral	18,200,000	18,200,000	20,200,000
Amount accrued in anticipation of negotiating final settlement and full resolution of settlement of lawsuit	$ 2,000,000	$ 2,000,000