Fair Value Of Assets And Liabilities (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		$ 22,445		$ 24,269
Loans, net of unearned income		19,090,074	[1]	19,589,520	[1]	$ 17,574,994
Real estate acquired by foreclosure	[2]	15,144		16,237
Other assets		132,229		155,479
Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	30,838		31,070
Real estate acquired by foreclosure	[4]	10,259		11,235
Other assets	[5]	28,667		29,609
Level 1
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0		0
Other assets		51,336		66,427
Level 1 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	0		0
Real estate acquired by foreclosure	[4]	0		0
Other assets	[5]	0		0
Level 2
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		1,224		2,345
Other assets		80,893		88,067
Level 2 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	0		0
Real estate acquired by foreclosure	[4]	0		0
Other assets	[5]	0		0
Level 3
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		21,221		21,924
Other assets		0		985
Level 3 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	30,838		31,070
Real estate acquired by foreclosure	[4]	10,259		11,235
Other assets	[5]	28,667		29,609
First Mortgages | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		606		638
First Mortgages | Level 1 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0		0
First Mortgages | Level 2 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0		0
First Mortgages | Level 3 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		606		638
SBAs [Member] | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		3,476		4,286
SBAs [Member] | Level 1 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0		0
SBAs [Member] | Level 2 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		3,476		4,286
SBAs [Member] | Level 3 | Non Recurring
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		$ 0		$ 0

[1] March 31, 2017 and December 31, 2016 include $30.3 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans se cured by residential real estate properties in process of foreclosure.

[2] March 31, 2017 and December 31, 2016 include $ 7.8 million and $8.1 million, respectively, of foreclosed residential real estate.

[3] Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral less estimated costs to sell.

[4] Represents the fair value of foreclosed properties that were measured subsequent to their initial classification as foreclosed assets. Balance excludes foreclosed real estate related to government insured mortgages.

[5] Represents tax credit investments accounted for under the equity method .