Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended		3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Citizens Financial Group [Member]	Mar. 31, 2009 Citizens Financial Group [Member]	Jun. 30, 2012 Monroe Bancorp [Member]	Jun. 30, 2012 Integra [Member]
Sale leaseback transaction, number of units	4
Sale leaseback transaction, financial centers	88
Sale leaseback transaction, carrying value of properties sold	$ 163.6
Sale leaseback transaction, gain on sale	123.9
Sale leaseback transaction, cash proceeds net of selling costs	287.4
Sale leaseback transaction, gain recognized over lease term	119.5
Sale leaseback transaction, deferred gain recognized	32.1
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	25.2		2.2		0.3
Number of leased locations acquired				65	2	17
Option exercisable of the acquisition, days	90
Rent expenses		2.0
Number of leased locations closed			24
Number of operation centers aquired					1
Number of leased ATM locations acquired					5
Number of retirement centers					3
Loan commitments	1,190	1,220
Fixed rate loan commitment	1,151
Floating rate loan commitment	39
Standby letters of credit	59.2	73.3
Loan commitment floating intrest rate, minimum	0.00%
Loan commitment floating intrest rate, maximum	21.00%
Allowance for unfunded loan commitments	3.3	4.8
Extended credit	18.5	24.2
Credit extensions with collateral	13.7	17.5
Amount accrued in anticipation of negotiating final settlement and resolution		$ 2