Allowance For Loan Losses And Credit Quality (Schedule Of Allowance For Loan Losses For Covered Loans, By Loan Portfolio) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	$ 193,761,000	$ 136,100,000
(Reversal of) Provision for loan losses	2,857,000	5,471,000
Transfer of balance to OREO	(5,363,000)
Loans charged-off	(15,537,000)	(3,294,000)
Recoveries	790,000	4,058,000
Balance, end of period	177,192,000	149,119,000
Allowance on loans individually evaluated for impairment	1,960,000		2,186,000
Loans, net of unearned income, Balance, end of period	7,301,114,000		7,194,276,000
Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	118,900,000	73,640,000
(Reversal of) Provision for loan losses	747,000	1,770,000
(Decrease) Increase in FDIC loss share receivable	684,000	6,784,000
Transfer of balance to OREO	(5,357,000)
Loans charged-off	(13,266,000)	(218,000)
Recoveries	17,000	327,000
Balance, end of period	101,725,000	82,303,000
Allowance on loans collectively evaluated for impairment	101,725,000	82,303,000
Loans, net of unearned income, Balance, end of period	1,260,662,000	1,519,555,000
Balance, end of period: Loans collectively evaluated for impairment	1,260,662,000	1,519,555,000
Balance, end of period: Loans acquired with deteriorated credit quality	77,637,000	276,802,000
Covered Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	69,175,000	26,439,000
(Reversal of) Provision for loan losses	1,386,000	1,745,000
(Decrease) Increase in FDIC loss share receivable	1,268,000	10,242,000
Transfer of balance to OREO	(3,179,000)
Loans charged-off	(13,126,000)	(158,000)
Recoveries	14,000	239,000
Balance, end of period	55,538,000	38,507,000
Allowance on loans collectively evaluated for impairment	55,538,000	38,507,000
Loans, net of unearned income, Balance, end of period	683,233,000	837,037,000
Balance, end of period: Loans collectively evaluated for impairment	683,233,000	837,037,000
Balance, end of period: Loans acquired with deteriorated credit quality	15,507,000	164,780,000
Covered Loans [Member] | Commercial Business [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	9,788,000	6,657,000
(Reversal of) Provision for loan losses	794,000	257,000
(Decrease) Increase in FDIC loss share receivable	728,000	955,000
Transfer of balance to OREO	(4,000)
Balance, end of period	11,306,000	7,869,000
Allowance on loans collectively evaluated for impairment	11,306,000	7,869,000
Loans, net of unearned income, Balance, end of period	140,073,000	160,093,000
Balance, end of period: Loans collectively evaluated for impairment	140,073,000	160,093,000
Balance, end of period: Loans acquired with deteriorated credit quality	3,121,000	5,766,000
Covered Loans [Member] | Consumer [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	18,753,000	12,201,000
(Reversal of) Provision for loan losses	578,000	12,000
(Decrease) Increase in FDIC loss share receivable	529,000	1,027,000
Transfer of balance to OREO	(797,000)
Loans charged-off	(9,000)	(41,000)
Recoveries	3,000	42,000
Balance, end of period	19,057,000	11,187,000
Allowance on loans collectively evaluated for impairment	19,057,000	11,187,000
Loans, net of unearned income, Balance, end of period	227,883,000	275,820,000
Balance, end of period: Loans collectively evaluated for impairment	227,883,000	275,820,000
Balance, end of period: Loans acquired with deteriorated credit quality	27,978,000	57,988,000
Covered Loans [Member] | Mortgage [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	21,184,000	28,343,000
(Reversal of) Provision for loan losses	(2,011,000)	(244,000)
(Decrease) Increase in FDIC loss share receivable	(1,841,000)	(3,386,000)
Transfer of balance to OREO	(1,377,000)
Loans charged-off	(131,000)	(19,000)
Recoveries		46,000
Balance, end of period	15,824,000	24,740,000
Allowance on loans collectively evaluated for impairment	15,824,000	24,740,000
Loans, net of unearned income, Balance, end of period	209,473,000	246,605,000
Balance, end of period: Loans collectively evaluated for impairment	209,473,000	246,605,000
Balance, end of period: Loans acquired with deteriorated credit quality	31,031,000	48,268,000
Covered Loans [Member] | Unallocated [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period
(Reversal of) Provision for loan losses
(Decrease) Increase in FDIC loss share receivable
Transfer of balance to OREO
Loans charged-off
Recoveries
Balance, end of period
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