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Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 19,090,074 | [1] | $ 19,589,520 | [1] | $ 17,574,994 |
Allowance for loan losses | 201,968 |  | 202,068 |  | 204,034 | $ 210,242
Total net loans | 18,888,106 |  | 19,387,452 |  |  |
Commercial Financial And Industrial Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 11,703,996 |  | 12,148,087 |  | 10,239,183 |
Allowance for loan losses | 93,107 |  | 89,398 |  | 80,887 | 73,637
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 2,173,311 |  | 2,135,523 |  | 1,848,569 |
Allowance for loan losses | 30,888 |  | 33,852 |  | 25,626 | 25,159
Consumer Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 4,456,811 | [2] | 4,523,752 | [2] | 4,690,230 |
Allowance for loan losses | 49,680 |  | 50,357 |  | 67,321 | 80,614
Permanent Mortgage Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 409,235 |  | 423,125 |  | 442,791 |
Allowance for loan losses | 15,893 |  | 16,289 |  | 18,754 | 18,947
Credit Card And Other Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 346,721 |  | 359,033 |  | 354,221 |
Allowance for loan losses | 12,400 |  | 12,172 |  | $ 11,446 | $ 11,885
Restricted And Secured Consumer Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 32,500 |  | $ 35,900 |  |  |
[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] | Balances as of March 3 1 , 201 7 and December 31, 201 6 , include $ 32 . 5 million and $ 35 . 9 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.

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