Allowance For Loan Losses And Credit Quality (Schedule Of Allowance For Loan Losses For 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
Transfer of balance to OREO	(17,143,000)
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
Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	73,640,000	145,000
(Reversal of) Provision for loan losses	5,893,000	8,897,000
Increase in FDIC loss share receivable or discount	57,121,000	64,922,000
Transfer of balance to OREO	(17,143,000)
Loans charged-off	(1,137,000)	(325,000)	(2,000)
Recoveries	526,000	1,000
Allowance for loan losses, end of year	118,900,000	73,640,000	145,000
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment	118,900,000	73,640,000
Loans, net of unearned income, Balance, end of period	1,334,449,000	1,582,747,000
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment	1,334,449,000	1,582,747,000
Balance, end of period: Loans acquired with deteriorated credit quality	89,372,000	263,248,000
Covered Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	26,439,000
(Reversal of) Provision for loan losses	6,762,000	3,192,000
Increase in FDIC loss share receivable or discount	50,079,000	23,294,000
Transfer of balance to OREO	(13,316,000)
Loans charged-off	(1,073,000)	(49,000)
Recoveries	284,000	1,000
Allowance for loan losses, end of year	69,175,000	26,439,000
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment	69,175,000	26,439,000
Loans, net of unearned income, Balance, end of period	727,968,000	865,363,000
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment	727,968,000	865,363,000
Balance, end of period: Loans acquired with deteriorated credit quality	23,127,000	146,331,000
Covered Loans [Member] | Commercial Business [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	6,657,000
(Reversal of) Provision for loan losses	392,000	802,000
Increase in FDIC loss share receivable or discount	2,899,000	5,855,000
Transfer of balance to OREO	(160,000)
Allowance for loan losses, end of year	9,788,000	6,657,000
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment	9,788,000	6,657,000
Loans, net of unearned income, Balance, end of period	148,878,000	174,504,000
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment	148,878,000	174,504,000
Balance, end of period: Loans acquired with deteriorated credit quality	4,053,000	6,119,000
Covered Loans [Member] | Consumer [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	12,201,000
(Reversal of) Provision for loan losses	971,000	1,476,000
Increase in FDIC loss share receivable or discount	7,188,000	10,773,000
Transfer of balance to OREO	(1,705,000)
Loans charged-off	(42,000)	(48,000)
Recoveries	140,000
Allowance for loan losses, end of year	18,753,000	12,201,000
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment	18,753,000	12,201,000
Loans, net of unearned income, Balance, end of period	241,329,000	281,494,000
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment	241,329,000	281,494,000
Balance, end of period: Loans acquired with deteriorated credit quality	30,383,000	60,232,000
Covered Loans [Member] | Mortgage Backed Securities [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	28,343,000	145,000
(Reversal of) Provision for loan losses	(2,232,000)	3,426,000
Increase in FDIC loss share receivable or discount	(3,045,000)	25,000,000
Transfer of balance to OREO	(1,962,000)
Loans charged-off	(22,000)	(228,000)
Recoveries	102,000
Allowance for loan losses, end of year	21,184,000	28,343,000
Allowance on loans individually evaluated for impairment
Allowance on loans collectively evaluated for impairment	21,184,000	28,343,000
Loans, net of unearned income, Balance, end of period	216,274,000	261,386,000
Balance, end of period: Loans individually evaluated for impairment
Balance, end of period: Loans collectively evaluated for impairment	216,274,000	261,386,000
Balance, end of period: Loans acquired with deteriorated credit quality	31,809,000	50,566,000
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
Increase in FDIC loss share receivable or discount
Transfer of balance to OREO
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