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Loans (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) number | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) number | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings loans |  | $ 304,700,000 |  | $ 346,000,000 | $ 304,700,000 |  | $ 346,000,000 |  |  |  |
Allowance for loan losses |  | 210,814,000 |  | 238,641,000 | 210,814,000 |  | 238,641,000 | $ 221,351,000 | $ 232,448,000 | $ 243,628,000 | $ 253,809,000
Average balance of impaired loans |  | 337,301,000 |  | 367,299,000 | 343,935,000 |  | 377,673,000 |  |  |  |
Interest income recognized on impaired loan |  | $ 1,718,000 |  | 1,668,000 | 5,086,000 |  | 5,015,000 |  |  |  |
Forbearance agreements time period |  | 6 months |  |  |  |  |  |  |  |  |
Loans, net of unearned income |  | $ 16,725,492,000 | [1] | 15,812,017,000 | 16,725,492,000 | [1] | 15,812,017,000 |  | 16,230,166,000 |  |
Provision/(provision credit) for loan losses |  | 1,000,000 |  | 6,000,000 | 8,000,000 |  | 21,000,000 |  |  |  |
Loan loss provision on PCI loans |  | 100,000 |  | 400,000 | 400,000 |  | 2,100,000 |  |  |  |
Allowance - purchased credit impaired loans |  | 2,919,000 |  | 2,839,000 | 2,919,000 |  | 2,839,000 |  |  |  |
Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 20,076,000 |  | 20,221,000 | $ 20,076,000 |  | 20,221,000 | 22,377,000 | 19,122,000 | 23,727,000 | 22,491,000
TDR, reduction of interest rate by increment, basis points |  | 0.25% |  |  | 0.25% |  |  |  |  |  |
TDRS Maturities |  | 40 years |  |  |  |  |  |  |  |  |
Loans, net of unearned income |  | $ 463,893,000 |  | 572,789,000 | $ 463,893,000 |  | 572,789,000 |  | 538,961,000 |  |
Modified interest rate increase |  | 1.00% |  |  | 1.00% |  |  |  |  |  |
Provision/(provision credit) for loan losses |  | $ (1,492,000) |  | (3,145,000) | $ 2,467,000 |  | (84,000) |  |  |  |
Allowance - purchased credit impaired loans |  | 0 |  | 0 | 0 |  | 0 |  |  |  |
Loans Held-For-Sale |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings loans |  | $ 72,600,000 |  | 83,100,000 | 72,600,000 |  | 83,100,000 |  |  |  |
Residential Real Estate |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 32.00% |  |  |  |  |  |  |  |  |
Consumer Real Estate Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  | 29.00% |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 82,472,000 |  | 118,395,000 | 82,472,000 |  | 118,395,000 | 85,457,000 | 113,011,000 | 118,037,000 | 126,785,000
TDRS Maturities |  | 30 years |  |  |  |  |  |  |  |  |
Loans, net of unearned income | [2] | $ 4,813,936,000 |  | 5,130,988,000 | 4,813,936,000 |  | 5,130,988,000 |  | 5,048,071,000 |  |
Provision/(provision credit) for loan losses |  | (776,000) |  | 8,154,000 | (25,465,000) |  | 9,300,000 |  |  |  |
Allowance - purchased credit impaired loans |  | 504,000 |  | 58,000 | 504,000 |  | 58,000 |  |  |  |
Modified Loans Classified As A TDR |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 51,200,000 |  | $ 60,900,000 | $ 51,200,000 |  | $ 60,900,000 |  |  |  |
Ratio of the allowance for loan losses to loans |  | 17.00% |  | 18.00% | 17.00% |  | 18.00% |  |  |  |
Loans To Mortgage Companies |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage contributed in total loan |  | 8.00% |  |  | 8.00% |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 14.00% |  |  |  |  |  |
Commercial loans |  | $ 1,375,320,000 |  | $ 957,641,000 | $ 1,375,320,000 |  | $ 957,641,000 |  |  |  |
Loans, net of unearned income |  | 1,375,320,000 |  | 957,641,000 | 1,375,320,000 |  | 957,641,000 |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 96,811,000 |  | 85,320,000 | 96,811,000 |  | 85,320,000 |  |  |  |
Average balance of impaired loans |  | 59,714,000 |  | 72,053,000 | 62,614,000 |  | 82,311,000 |  |  |  |
Interest income recognized on impaired loan |  | 276,000 |  | 200,000 | 841,000 |  | 645,000 |  |  |  |
Commercial loans |  | $ 11,098,339,000 |  | 9,755,723,000 | 11,098,339,000 |  | 9,755,723,000 |  |  |  |
Time period of default probability |  | 1 year |  |  |  |  |  |  |  |  |
Allowance - purchased credit impaired loans |  | $ 2,414,000 |  | 2,781,000 | 2,414,000 |  | 2,781,000 |  |  |  |
Credit Card & Other |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 11,455,000 |  | 14,705,000 | 11,455,000 |  | 14,705,000 | $ 13,275,000 | 14,730,000 | $ 17,452,000 | $ 7,484,000
Loans, net of unearned income |  | 349,324,000 |  | 352,517,000 | 349,324,000 |  | 352,517,000 |  | 358,131,000 |  |
Provision/(provision credit) for loan losses |  | 666,000 |  | 84,000 | 7,256,000 |  | 16,014,000 |  |  |  |
Allowance - purchased credit impaired loans |  | $ 1,000 |  | 0 | $ 1,000 |  | 0 |  |  |  |
Credit Card |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit card workout program, granted rate reduction |  | 0.00% |  |  | 0.00% |  |  |  |  |  |
Loans, net of unearned income |  | $ 190,990,000 |  | 188,372,000 | $ 190,990,000 |  | 188,372,000 |  |  |  |
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% |  |  | 0.25% |  |  |  |  |  |
Restricted And Secured Consumer Real Estate Loans |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans, net of unearned income |  | $ 59,300,000 |  | 81,100,000 | $ 59,300,000 |  | 81,100,000 |  | $ 76,800,000 |  |
Finance And Insurance Companies |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage contributed in total loan |  | 13.00% |  |  | 13.00% |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 22.00% |  |  |  |  |  |
Commercial loans |  | $ 2,100,000,000 |  |  | $ 2,100,000,000 |  |  |  |  |  |
Finance Insurance And Loans To Mortgage Companies |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage contributed in total loan |  | 36.00% |  |  | 36.00% |  |  |  |  |  |
Maximum | Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Modified interest rate time period |  | 5 years |  |  |  |  |  |  |  |  |
Maximum | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Forbearance agreements time period |  | 12 months |  |  |  |  |  |  |  |  |
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 | 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% |  |  |  |  |  |
Special Mention |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 13 |  |  | 13 |  |  |  |  |  |
Substandard |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 14 |  |  | 14 |  |  |  |  |  |
Doubtful |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 15 |  |  | 15 |  |  |  |  |  |
Unlikely to be Collected Financing Receivable |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 16 |  |  | 16 |  |  |  |  |  |
PD Grade 1 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 127,000 |  | 0 | $ 127,000 |  | 0 |  |  |  |
Lowest expected default probability | number |  | 1 |  |  | 1 |  |  |  |  |  |
PD Grade 12 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ 2,975,000 |  | 1,383,000 | $ 2,975,000 |  | 1,383,000 |  |  |  |
PD Grade 13 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 4,256,000 |  | $ 6,716,000 | 4,256,000 |  | $ 6,716,000 |  |  |  |
PD Grade 13 | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ 500,000 |  |  | $ 500,000 |  |  |  |  |  |
LGD Grade 1 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 1 |  |  | 1 |  |  |  |  |  |
LGD Grade 12 |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loan grades | number |  | 12 |  |  | 12 |  |  |  |  |  |
Loan Reassessed | Minimum |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ 1,000,000 |  |  | $ 1,000,000 |  |  |  |  |  |
[1] | September 30, 2015 includes $30.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] | (a) Balances as of September 30, 2015 and 2014, and December 31, 2014 include $ 59. 3 million, $ 81 . 1 million, and $ 76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.

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