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Loans (Schedule Of Loans By Portfolio Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 27,658,929 | [1] | $ 19,589,520 | [1] | $ 17,686,502 |
Allowance for loan losses | 189,555 |  | 202,068 |  | 210,242 | $ 232,448
Total net loans | 27,469,374 |  | 19,387,452 |  |  |
Restricted And Secured Consumer Real Estate Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 24,200 |  | 35,900 |  |  |
C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 16,057,273 |  | 12,148,087 |  | 10,436,390 |
Allowance for loan losses | 98,211 |  | 89,398 |  | 73,637 | 67,011
Commercial Real Estate Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 4,214,695 |  | 2,135,523 |  | 1,674,935 |
Allowance for loan losses | 28,427 |  | 33,852 |  | 25,159 | 18,574
Consumer Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 6,367,755 |  | 4,523,752 |  | 4,766,518 |
Allowance for loan losses | 37,371 |  | 50,357 |  | 80,614 | 113,011
Permanent Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 399,307 |  | 423,125 |  | 454,123 |
Allowance for loan losses | 15,565 |  | 16,289 |  | 18,947 | 19,122
Credit Card And Other Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 619,899 |  | 359,033 |  | 354,536 |
Allowance for loan losses | $ 9,981 |  | $ 12,172 |  | $ 11,885 | $ 14,730
[1] | December 31, 2017 and 2016 include $22.7 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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