Allowance For Loan Losses And Credit Quality (Schedule Of Allowance For Loan Losses For Non-Covered Loans, By Loan Portfolio) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	$ 136,100,000	$ 55,768,000	$ 40,872,000
(Reversal of) Provision for loan losses	25,867,000	42,451,000	45,370,000
Loans charged-off	(16,159,000)	(33,858,000)	(33,267,000)
Recoveries	7,975,000	6,817,000	2,646,000
Allowance for loan losses, end of year	193,761,000	136,100,000	55,768,000
Allowance on loans individually evaluated for impairment	2,186,000	206,000
Loans, net of unearned income, Balance, end of period	7,194,276,000	5,899,232,000
Non-Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	62,460,000	55,623,000	40,872,000
(Reversal of) Provision for loan losses	19,974,000	33,554,000	45,370,000
Loans charged-off	(15,022,000)	(33,533,000)	(33,265,000)
Recoveries	7,449,000	6,816,000	2,646,000
Allowance for loan losses, end of year	74,861,000	62,460,000	55,623,000
Allowance on loans individually evaluated for impairment	2,186,000	206,000
Allowance on loans collectively evaluated for impairment	72,675,000	62,254,000
Loans, net of unearned income, Balance, end of period	6,053,588,000	4,452,585,000
Balance, end of period: Loans individually evaluated for impairment	42,311,000	34,177,000
Balance, end of period: Loans collectively evaluated for impairment	6,011,277,000	4,418,408,000
Balance, end of period: Loans acquired with deteriorated credit quality	35,495,000	645,000
Non-Covered Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	31,390,000	30,771,000
(Reversal of) Provision for loan losses	6,809,000	18,563,000
Loans charged-off	(7,656,000)	(22,671,000)
Recoveries	5,061,000	4,727,000
Allowance for loan losses, end of year	35,604,000	31,390,000
Allowance on loans individually evaluated for impairment	1,874,000	206,000
Allowance on loans collectively evaluated for impairment	33,730,000	31,184,000
Loans, net of unearned income, Balance, end of period	2,591,013,000	1,781,744,000
Balance, end of period: Loans individually evaluated for impairment	34,541,000	29,222,000
Balance, end of period: Loans collectively evaluated for impairment	2,556,472,000	1,752,522,000
Balance, end of period: Loans acquired with deteriorated credit quality	4,835,000	645,000
Non-Covered Loans [Member] | Commercial Business [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	16,473,000	12,845,000
(Reversal of) Provision for loan losses	9,533,000	4,407,000
Loans charged-off	(471,000)	(914,000)
Recoveries	170,000	135,000
Allowance for loan losses, end of year	25,705,000	16,473,000
Allowance on loans individually evaluated for impairment	179,000
Allowance on loans collectively evaluated for impairment	25,526,000	16,473,000
Loans, net of unearned income, Balance, end of period	1,896,496,000	1,341,352,000
Balance, end of period: Loans individually evaluated for impairment	6,530,000	4,955,000
Balance, end of period: Loans collectively evaluated for impairment	1,889,966,000	1,336,397,000
Balance, end of period: Loans acquired with deteriorated credit quality	26,531,000
Non-Covered Loans [Member] | Consumer [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	13,332,000	10,664,000
(Reversal of) Provision for loan losses	3,847,000	9,898,000
Loans charged-off	(6,673,000)	(9,108,000)
Recoveries	2,149,000	1,878,000
Allowance for loan losses, end of year	12,655,000	13,332,000
Allowance on loans collectively evaluated for impairment	12,655,000	13,332,000
Loans, net of unearned income, Balance, end of period	1,282,966,000	959,503,000
Balance, end of period: Loans individually evaluated for impairment	231,000
Balance, end of period: Loans collectively evaluated for impairment	1,282,735,000	959,503,000
Balance, end of period: Loans acquired with deteriorated credit quality	4,129,000
Non-Covered Loans [Member] | Mortgage Backed Securities [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	1,265,000	1,343,000
(Reversal of) Provision for loan losses	(215,000)	687,000
Loans charged-off	(222,000)	(840,000)
Recoveries	69,000	76,000
Allowance for loan losses, end of year	897,000	1,265,000
Allowance on loans individually evaluated for impairment	133,000
Allowance on loans collectively evaluated for impairment	764,000	1,265,000
Loans, net of unearned income, Balance, end of period	283,113,000	369,986,000
Balance, end of period: Loans individually evaluated for impairment	1,009,000
Balance, end of period: Loans collectively evaluated for impairment	282,104,000	369,986,000
Non-Covered Loans [Member] | Unallocated [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year
(Reversal of) Provision for loan losses
Loans charged-off
Recoveries
Allowance for loan losses, end of year
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment
Loans, net of unearned income, Balance, end of period
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment
Balance, end of period: Loans acquired with deteriorated credit quality