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Fair Value of Assets & Liabilities (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | $ 20,881 |  | $ 24,269 |  |
Loans, net of unearned income |  | 27,658,929 | [1] | 19,589,520 | [1] | $ 17,686,502
Other real estate owned (OREO) | [2] | 43,382 |  | 16,237 |  |
Net Gains Or Losses Loans Net of Unearned Income |  | (1,687) |  | (2,055) |  | 4,087
Net Gains Or Losses Real Estate Acquired by Foreclosure |  | (996) |  | (2,041) |  | (2,868)
Net Gains Or Losses Other Assets |  | (3,468) |  | (3,349) |  | (4,582)
Net Gains Loss On Financial Assets Measured On Nonrecurring Basis |  | (7,744) |  | (7,371) |  | (3,306)
Non Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 26,666 |  | 31,070 |  | 27,026
Other real estate owned (OREO) |  | 39,566 |  | 11,235 |  | 24,977
Other assets |  | 26,521 |  | 29,609 |  | 24,577
Non Recurring | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 466,977 |  | 4,286 |  |
Net Gains Or Losses Loans Held For Sale |  | (1,629) |  | (1) |  |
Non Recurring | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 618 |  | 638 |  | 729
Net Gains Or Losses Loans Held For Sale |  | 36 |  | 75 |  | 57
Non Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 0 |  | 0 |  | 0
Other real estate owned (OREO) |  | 0 |  | 0 |  | 0
Other assets |  | 0 |  | 0 |  | 0
Non Recurring | Level 1 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  |
Non Recurring | Level 1 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  | 0
Non Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 0 |  | 0 |  | 0
Other real estate owned (OREO) |  | 0 |  | 0 |  | 0
Other assets |  | 0 |  | 0 |  | 0
Non Recurring | Level 2 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 465,504 |  | 4,286 |  |
Non Recurring | Level 2 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 0 |  | 0 |  | 0
Non Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net of unearned income |  | 26,666 |  | 31,070 |  | 27,026
Other real estate owned (OREO) |  | 39,566 |  | 11,235 |  | 24,977
Other assets |  | 26,521 |  | 29,609 |  | 24,577
Non Recurring | Level 3 | SBAs and USDA |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 1,473 |  | 0 |  |
Non Recurring | Level 3 | First Mortgages |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | $ 618 |  | $ 638 |  | $ 729
[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.
[2] | December 31, 2017 and 2016 include $6.3 million and $8.1 million, respectively, of foreclosed residential real estate.

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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