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Loans (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) grade | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) grade | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 20,166,091,000 | [1] | $ 19,555,787,000 | $ 20,166,091,000 | [1] | $ 19,555,787,000 |  | $ 19,589,520,000 | [1] |  |
Allowance - purchased credit impaired loans | 3,135,000 |  | 1,166,000 | 3,135,000 |  | 1,166,000 |  | 700,000 |  |  |
Provision expense for Loan and Lease Losses | 2,600,000 |  | 300,000 | 2,400,000 |  |  |  |  |  |  |
Troubled debt restructurings loans | 241,600,000 |  |  | 241,600,000 |  |  |  | 285,200,000 |  |  |
Less: Allowance for loan losses | 194,867,000 |  | 201,557,000 | 194,867,000 |  | 201,557,000 | $ 197,257,000 | 202,068,000 |  | $ 199,807,000 | $ 210,242,000
Average balance of impaired loans | 260,083,000 |  | 312,649,000 | 275,227,000 |  | 313,034,000 |  |  |  |  |
Interest income recognized on impaired loan | 1,692,000 |  | 1,760,000 | 5,104,000 |  | 4,898,000 |  |  |  |  |
Provision for loan losses | 0 |  | 4,000,000 | (3,000,000) |  | 11,000,000 |  |  |  |  |
Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | 15,042,859,000 |  |  | 15,042,859,000 |  |  |  | 14,283,610,000 |  |  |
Allowance - purchased credit impaired loans | 2,781,000 |  |  | 2,781,000 |  |  |  | 319,000 |  |  |
Less: Allowance for loan losses | 127,888,000 |  |  | 127,888,000 |  |  |  | 123,250,000 |  |  |
Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | 403,082,000 |  | 436,100,000 | 403,082,000 |  | 436,100,000 |  | 423,125,000 |  |  |
Allowance - purchased credit impaired loans | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Less: Allowance for loan losses | $ 15,719,000 |  | 16,589,000 | $ 15,719,000 |  | 16,589,000 | 16,398,000 | 16,289,000 |  | 17,600,000 | 18,947,000
TDR, reduction of interest rate by increment, basis points | 0.25% |  |  | 0.25% |  |  |  |  |  |  |
TDRS Maturities |  |  |  | 40 years |  |  |  |  |  |  |
Modified interest rate increase | 1.00% |  |  | 1.00% |  |  |  |  |  |  |
Provision for loan losses | $ (1,048,000) |  | (877,000) | $ (1,004,000) |  | (3,026,000) |  |  |  |  |
Loans Held-For-Sale |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings loans | 63,200,000 |  |  | $ 63,200,000 |  |  |  | 69,300,000 |  |  |
Residential Real Estate |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  | 24.00% |  |  |  |  |  |  |
Consumer Real Estate Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | 4,369,717,000 |  | 4,578,371,000 | $ 4,369,717,000 |  | 4,578,371,000 |  | 4,523,752,000 |  |  |
Concentration risk, percentage |  |  |  | 22.00% |  |  |  |  |  |  |
Allowance - purchased credit impaired loans | 354,000 |  | 333,000 | $ 354,000 |  | 333,000 |  |  |  |  |
Less: Allowance for loan losses | 40,939,000 |  | 53,235,000 | $ 40,939,000 |  | 53,235,000 | 46,069,000 | 50,357,000 |  | 59,081,000 | 80,614,000
TDRS Maturities |  |  |  | 30 years |  |  |  |  |  |  |
Provision for loan losses | (7,717,000) |  | (7,078,000) | $ (15,024,000) |  | (26,920,000) |  |  |  |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan loss reserves | $ 38,600,000 |  |  | $ 38,600,000 |  |  |  | $ 44,900,000 |  |  |
Ratio of the allowance for loan losses to loans | 16.00% |  |  | 16.00% |  |  |  | 16.00% |  |  |
Loans To Mortgage Companies |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 1,966,155,000 |  |  | $ 1,966,155,000 |  |  |  | $ 2,045,189,000 |  |  |
Loans To Mortgage Companies | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | $ 1,966,155,000 |  |  | $ 1,966,155,000 |  |  |  | 2,045,189,000 |  |  |
Percentage of commercial & industrial loan portfolio | 15.00% |  |  | 15.00% |  |  |  |  |  |  |
Percentage contributed in total loan | 10.00% |  |  | 10.00% |  |  |  |  |  |  |
Credit Card And Other Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 350,433,000 |  | 357,423,000 | $ 350,433,000 |  | 357,423,000 |  | 359,033,000 |  |  |
Allowance - purchased credit impaired loans | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Less: Allowance for loan losses | 10,321,000 |  | 12,447,000 | 10,321,000 |  | 12,447,000 | $ 11,941,000 | 12,172,000 |  | $ 11,890,000 | $ 11,885,000
Provision for loan losses | 882,000 |  | $ 3,240,000 | 5,698,000 |  | $ 8,217,000 |  |  |  |  |
Credit Card |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 194,049,000 |  |  | $ 194,049,000 |  |  |  | 191,651,000 |  |  |
Credit card workout program, granted rate reduction | 0.00% |  |  | 0.00% |  |  |  |  |  |  |
Heloc And Real Estate Installment Classes |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
TDR, reduction of interest rate by increment, basis points | 0.25% |  |  | 0.25% |  |  |  |  |  |  |
Modified interest rate increase | 2.00% |  |  | 2.00% |  |  |  |  |  |  |
Restricted And Secured Consumer Real Estate Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 26,200,000 |  |  | $ 26,200,000 |  |  |  | 35,900,000 |  |  |
Finance And Insurance Companies | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | $ 2,800,000,000 |  |  | $ 2,800,000,000 |  |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 22.00% |  |  | 22.00% |  |  |  |  |  |  |
Percentage contributed in total loan | 14.00% |  |  | 14.00% |  |  |  |  |  |  |
Finance Insurance And Loans To Mortgage Companies | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 37.00% |  |  | 37.00% |  |  |  |  |  |  |
TRUPs |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 307,333,000 |  |  | $ 307,333,000 |  |  |  | 307,445,000 | [2] |  |
Loan loss reserves | 25,500,000 |  |  | 25,500,000 |  |  |  | 25,500,000 |  |  |
TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | 307,333,000 |  |  | 307,333,000 |  |  |  | 307,445,000 | [3] |  |
Loan loss reserves | $ 25,500,000 |  |  | $ 25,500,000 |  |  |  | 25,500,000 |  |  |
Maximum | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forbearance agreements time period |  |  |  | 12 months |  |  |  |  |  |  |
Maximum | Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified interest rate time period |  |  |  | 5 years |  |  |  |  |  |  |
Maximum | Credit Card |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment reductions, time period |  |  |  | 1 year |  |  |  |  |  |  |
Credit card workout program, term extension |  |  |  | 5 years |  |  |  |  |  |  |
Maximum | Heloc And Real Estate Installment Classes |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified interest rate time period |  |  |  | 5 years |  |  |  |  |  |  |
Minimum | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forbearance agreements time period |  |  |  | 6 months |  |  |  |  |  |  |
Minimum | Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified interest rate | 2.00% |  |  | 2.00% |  |  |  |  |  |  |
Modified interest rate time period |  |  |  | 5 years |  |  |  |  |  |  |
Minimum | Credit Card |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment reductions, time period |  |  |  | 6 months |  |  |  |  |  |  |
Minimum | Heloc And Real Estate Installment Classes |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified interest rate | 1.00% |  |  | 1.00% |  |  |  |  |  |  |
Modified interest rate time period |  |  |  | 5 years |  |  |  |  |  |  |
Pass | Maximum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 12 |  |  | 12 |  |  |  |  |  |  |
Pass | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 1 |  |  | 1 |  |  |  |  |  |  |
Special Mention |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 13 |  |  | 13 |  |  |  |  |  |  |
Special Mention | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 13 |  |  | 13 |  |  |  |  |  |  |
Substandard |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 14 |  |  | 14 |  |  |  |  |  |  |
Doubtful |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 15 |  |  | 15 |  |  |  |  |  |  |
Loss |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 16 |  |  | 16 |  |  |  |  |  |  |
Loss | Maximum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 16 |  |  | 16 |  |  |  |  |  |  |
PD Grade 1 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lowest expected default probability | grade | 1 |  |  | 1 |  |  |  |  |  |  |
PD Grade 1 | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Allowance for loan losses | $ 81,000 |  |  | $ 81,000 |  |  |  | 77,000 |  |  |
PD Grade 12 | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Allowance for loan losses | 7,065,000 |  |  | 7,065,000 |  |  |  | 6,377,000 |  |  |
PD Grade 13 | Commercial Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: Allowance for loan losses | 6,927,000 |  |  | 6,927,000 |  |  |  | $ 4,225,000 |  |  |
PD Grade 13 | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | $ 500,000 |  |  | $ 500,000 |  |  |  |  |  |  |
LGD Grade 1 | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 1 |  |  | 1 |  |  |  |  |  |  |
LGD Grade 12 | Maximum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | grade | 12 |  |  | 12 |  |  |  |  |  |  |
Loan Reassessed | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans | $ 1,000,000 |  |  | $ 1,000,000 |  |  |  |  |  |  |
[1] | September 30, 2017 and December 31, 2016 include $24.8 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.
[2] | TRUPS is presented net of the valuation allowance of $25.5 million.
[3] | Balances as of September 30, 2017 and December 31, 2016, presented net of a $25.5 million valuation allowance. Based on the underlying structure of the notes, the highest possible internal grade is “13”.

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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