Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 232,448,000		$ 253,809,000
Charge-offs	(17,999,000)		(24,692,000)
Recoveries	8,879,000		8,129,000
Provision for loan losses	5,000,000		10,000,000
Ending Balance	228,328,000		247,246,000
Allowance - individually evaluated for impairment	66,361,000		69,782,000
Allowance - collectively evaluated for impairment	158,872,000		175,565,000
Allowance - purchased credit impaired loans	3,095,000		1,899,000
Individually evaluated for impairment	348,158,000		377,861,000
Collectively evaluated for impairment	16,351,273,000		14,695,248,000
Purchase credit impaired loans - recorded investment	32,692,000		46,352,000
Loans, net of unearned income	16,732,123,000	[1]	15,119,461,000		16,230,166,000
Commercial Financial And Industrial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	67,011,000		86,446,000
Charge-offs	(3,555,000)		(5,807,000)
Recoveries	1,953,000		1,602,000
Provision for loan losses	2,243,000		(9,509,000)
Ending Balance	67,652,000		72,732,000
Allowance - individually evaluated for impairment	6,019,000		5,187,000
Allowance - collectively evaluated for impairment	61,440,000		67,477,000
Allowance - purchased credit impaired loans	193,000		68,000
Individually evaluated for impairment	52,697,000		54,968,000
Collectively evaluated for impairment	9,580,800,000		7,691,266,000
Purchase credit impaired loans - recorded investment	4,858,000		6,761,000
Loans, net of unearned income	9,638,355,000		7,752,995,000		9,007,286,000
Commercial Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	18,574,000		10,603,000
Charge-offs	(787,000)		(627,000)
Recoveries	691,000		279,000
Provision for loan losses	(813,000)		5,268,000
Ending Balance	17,665,000		15,523,000
Allowance - individually evaluated for impairment	611,000		1,495,000
Allowance - collectively evaluated for impairment	14,642,000		12,207,000
Allowance - purchased credit impaired loans	2,412,000		1,821,000
Individually evaluated for impairment	12,528,000		26,701,000
Collectively evaluated for impairment	1,282,944,000		1,086,829,000
Purchase credit impaired loans - recorded investment	25,425,000		38,888,000
Loans, net of unearned income	1,320,897,000		1,152,418,000		1,277,717,000
Consumer Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	113,011,000		126,785,000
Charge-offs	(8,537,000)		(12,264,000)
Recoveries	4,724,000		4,974,000
Provision for loan losses	47,000		3,914,000
Ending Balance	109,245,000		123,409,000
Allowance - individually evaluated for impairment	41,737,000		43,653,000
Allowance - collectively evaluated for impairment	67,018,000		79,746,000
Allowance - purchased credit impaired loans	490,000		10,000
Individually evaluated for impairment	171,611,000		173,577,000
Collectively evaluated for impairment	4,748,806,000		5,083,734,000
Purchase credit impaired loans - recorded investment	2,400,000		703,000
Loans, net of unearned income	4,922,817,000	[2]	5,258,014,000	[2]	5,048,071,000	[2]
Permanent Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	19,122,000		22,491,000
Charge-offs	(1,184,000)		(2,218,000)
Recoveries	618,000		578,000
Provision for loan losses	1,630,000		1,670,000
Ending Balance	20,186,000		22,521,000
Allowance - individually evaluated for impairment	17,766,000		19,211,000
Allowance - collectively evaluated for impairment	2,420,000		3,310,000
Allowance - purchased credit impaired loans	0		0
Individually evaluated for impairment	110,838,000		121,843,000
Collectively evaluated for impairment	400,870,000		500,399,000
Purchase credit impaired loans - recorded investment	0		0
Loans, net of unearned income	511,708,000		622,242,000		538,961,000
Credit Card & Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	14,730,000		7,484,000
Charge-offs	(3,936,000)		(3,776,000)
Recoveries	893,000		696,000
Provision for loan losses	1,893,000		8,657,000
Ending Balance	13,580,000		13,061,000
Allowance - individually evaluated for impairment	228,000		236,000
Allowance - collectively evaluated for impairment	13,352,000		12,825,000
Allowance - purchased credit impaired loans	0		0
Individually evaluated for impairment	484,000		772,000
Collectively evaluated for impairment	337,853,000		333,020,000
Purchase credit impaired loans - recorded investment	9,000		0
Loans, net of unearned income	$ 338,346,000		$ 333,792,000		$ 358,131,000

[1] (b) March 31, 2015 includes $28.0 million of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.

[2] (a) Balances as of March 31, 2015 and 2014, and December 31, 2014 include $71.6 million, $86.7 million, and $76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.