Fair Value Of Assets And Liabilities (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		$ 22,750	$ 26,789	$ 22,750	$ 26,789
Loans, net of unearned income	[1]	19,555,787	16,725,492	19,555,787	16,725,492	$ 17,686,502
Real estate acquired by foreclosure	[2]	18,945	35,332	18,945	35,332	$ 33,063
Other assets		193,874	180,513	193,874	180,513
Net gains/(losses), Loans, net of unearned income	[3]	461	1,195	(3,249)	2,729
Net gains/(losses), Real estate acquired by foreclosure	[4]	(711)	(706)	(1,561)	(2,366)
Net gains/(losses), Other assets	[5]	(788)	(439)	(2,325)	(1,383)
Gain (loss) on financial assets measured on non-recurring basis		(1,028)	60	(7,118)	(972)
Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	31,797	27,898	31,797	27,898
Real estate acquired by foreclosure	[4]	13,678	25,872	13,678	25,872
Other assets	[5]	28,285	27,825	28,285	27,825
Fair Value Inputs Level1 [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0	0	0	0
Other assets		43,651	42,307	43,651	42,307
Fair Value Inputs Level1 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	0	0	0	0
Real estate acquired by foreclosure	[4]	0	0	0	0
Other assets	[5]	0	0	0	0
Fair Value Inputs Level2 [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		214	0	214	0
Other assets		148,977	136,213	148,977	136,213
Fair Value Inputs Level2 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	0	0	0	0
Real estate acquired by foreclosure	[4]	0	0	0	0
Other assets	[5]	0	0	0	0
Fair Value Inputs Level3 [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		22,536	26,789	22,536	26,789
Other assets		1,246	1,993	1,246	1,993
Fair Value Inputs Level3 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans, net of unearned income	[3]	31,797	27,898	31,797	27,898
Real estate acquired by foreclosure	[4]	13,678	25,872	13,678	25,872
Other assets	[5]	28,285	27,825	28,285	27,825
First Mortgage [Member]
Fair Value Of Assets And Liabilities [Line Items]
Net gains/(losses), Loans held for sale		10	10	17	48
First Mortgage [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		671	726	671	726
First Mortgage [Member] | Fair Value Inputs Level1 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0	0	0	0
First Mortgage [Member] | Fair Value Inputs Level2 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		0	0	0	0
First Mortgage [Member] | Fair Value Inputs Level3 [Member] | Fair Value Measurements Nonrecurring [Member]
Fair Value Of Assets And Liabilities [Line Items]
Loans held-for-sale		$ 671	$ 726	$ 671	$ 726

[1] September 30 , 2016 and 2015 and December 31, 2015 include $30.3 million, $30.7 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in pr ocess of foreclosure.

[2] September 30 , 2016 and 2015 an d December 31, 2015 include $9.7 million , $ 15.6 million and $14.6 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. Write-downs on these loans are recognized as part of provision for loan losses.

[4] Represents the fair value and related losses 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 account ed for under the equity method .