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Loans (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) number | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Sep. 16, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Troubled debt restructurings loans | $ 270,000,000 |  |  | $ 285,200,000 |  |  |
Allowance for loan losses | 201,968,000 |  | $ 204,034,000 | 202,068,000 |  |  | $ 210,242,000
Average balance of impaired loans | 291,167,000 |  | 310,405,000 | 310,368,000 |  |  |
Interest income recognized on impaired loan | 1,733,000 |  | 1,467,000 | 6,779,000 |  |  |
Loans, net of unearned income | 19,090,074,000 | [1] | 17,574,994,000 | 19,589,520,000 | [1] |  |
Provision for loan losses | (1,000,000) |  | 3,000,000 |  |  |  |
Allowance - purchased credit impaired loans | 590,000 |  | 1,148,000 | 700,000 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 123,995,000 |  |  | 123,250,000 |  |  |
Commercial loans | 13,877,307,000 |  |  | 14,283,610,000 |  |  |
Allowance - purchased credit impaired loans | 240,000 |  |  | 319,000 |  |  |
As Acquired | GE Capital Member |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans acquired |  |  |  |  |  | $ 537,400,000 |
Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | $ 15,893,000 |  | 18,754,000 | 16,289,000 |  |  | 18,947,000
TDR, reduction of interest rate by increment, basis points | 0.25% |  |  |  |  |  |
TDRS Maturities | 40 years |  |  |  |  |  |
Loans, net of unearned income | $ 409,235,000 |  | 442,791,000 | 423,125,000 |  |  |
Modified interest rate increase | 1.00% |  |  |  |  |  |
Provision for loan losses | $ (816,000) |  | (860,000) |  |  |  |
Allowance - purchased credit impaired loans | 0 |  | 0 |  |  |  |
Loans Held-For-Sale |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Troubled debt restructurings loans | $ 67,200,000 |  |  | 69,300,000 |  |  |
Residential Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage | 25.00% |  |  |  |  |  |
Consumer Real Estate Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage | 23.00% |  |  |  |  |  |
Allowance for loan losses | $ 49,680,000 |  | 67,321,000 | 50,357,000 |  |  | 80,614,000
TDRS Maturities | 30 years |  |  |  |  |  |
Loans, net of unearned income | $ 4,456,811,000 | [2] | 4,690,230,000 | 4,523,752,000 | [2] |  |
Provision for loan losses | (2,504,000) |  | (12,102,000) |  |  |  |
Allowance - purchased credit impaired loans | 350,000 |  | 725,000 |  |  |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Troubled debt restructurings loans | $ 43,400,000 |  |  | $ 44,900,000 |  |  |
Ratio of the allowance for loan losses to loans | 16.00% |  |  | 16.00% |  |  |
Loans To Mortgage Companies |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans, net of unearned income | $ 1,528,982,000 |  |  | $ 2,045,189,000 |  |  |
Loans To Mortgage Companies | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage contributed in total loan | 8.00% |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 13.00% |  |  |  |  |  |
Commercial loans | $ 1,528,982,000 |  |  | 2,045,189,000 |  |  |
Credit Card & Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 12,400,000 |  | 11,446,000 | 12,172,000 |  |  | $ 11,885,000
Loans, net of unearned income | 346,721,000 |  | 354,221,000 | 359,033,000 |  |  |
Provision for loan losses | 2,872,000 |  | 2,080,000 |  |  |  |
Allowance - purchased credit impaired loans | $ 0 |  | $ 1,000 |  |  |  |
Credit Card |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Credit card workout program, granted rate reduction | 0.00% |  |  |  |  |  |
Loans, net of unearned income | $ 184,971,000 |  |  | 191,651,000 |  |  |
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% |  |  |  |  |  |
Modified interest rate increase | 2.00% |  |  |  |  |  |
Restricted And Secured Consumer Real Estate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans, net of unearned income | $ 32,500,000 |  |  | 35,900,000 |  |  |
Finance And Insurance Companies | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage contributed in total loan | 13.00% |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 22.00% |  |  |  |  |  |
Commercial loans | $ 2,600,000,000 |  |  |  |  |  |
Finance Insurance And Loans To Mortgage Companies | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 35.00% |  |  |  |  |  |
Maximum | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |
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% |  |  |  |  |  |
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% |  |  |  |  |  |
Modified interest rate time period | 5 years |  |  |  |  |  |
Pass | Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 12 |  |  |  |  |  |
Pass | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 1 |  |  |  |  |  |
Special Mention |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 13 |  |  |  |  |  |
Special Mention | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 13 |  |  |  |  |  |
Substandard |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 14 |  |  |  |  |  |
Doubtful |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 15 |  |  |  |  |  |
Loss |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 16 |  |  |  |  |  |
Loss | Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 16 |  |  |  |  |  |
PD Grade 1 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Lowest expected default probability | number | 1 |  |  |  |  |  |
PD Grade 1 | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | $ 78,000 |  |  | 77,000 |  |  |
PD Grade 12 | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 6,862,000 |  |  | 6,377,000 |  |  |
PD Grade 13 | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 3,757,000 |  |  | $ 4,225,000 |  |  |
PD Grade 13 | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loans | $ 500,000 |  |  |  |  |  |
LGD Grade 1 | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 1 |  |  |  |  |  |
LGD Grade 12 | Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan grades | number | 12 |  |  |  |  |  |
Loan Reassessed | Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loans | $ 1,000,000 |  |  |  |  |  |
[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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