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Loans - Troubled Debt Restructuring Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled debt restructurings loans | $ 241.6 | $ 228.2
Allowance For TDRs To Recorded Investment Of TDRs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan loss reserves | $ 24.4 | $ 27.7
Ratio of the allowance for loan losses to loans | 10.00% | 12.00%
Loans Held For Sale, Residential Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled debt restructurings loans | $ 55.4 | $ 57.8
Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDRS Maturities | 30 years |
Consumer | Permanent Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR, reduction of interest rate by increment, basis points | 0.25% |
Modified interest rate increase | 1.00% |
TDRS Maturities | 40 years |
Minimum | Consumer | Permanent Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified interest rate | 2.00% |
Modified interest rate time period | 5 years |
Minimum | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Forbearance agreements time period | 6 months |
Maximum | Consumer | Permanent Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified interest rate time period | 5 years |
Maximum | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Forbearance agreements time period | 12 months |
Heloc And Real Estate Installment Classes | Consumer | Consumer Real Estate |  |
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% |
Heloc And Real Estate Installment Classes | Minimum | Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified interest rate | 1.00% |
Modified interest rate time period | 5 years |
Heloc And Real Estate Installment Classes | Maximum | Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified interest rate time period | 5 years |
Credit Card | Consumer | Credit Card and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Credit card workout program, granted rate reduction | 0.00% |
Credit Card | Minimum | Consumer | Credit Card and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment reductions, time period | 6 months |
Credit Card | Maximum | Consumer | Credit Card and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment reductions, time period | 1 year |
Credit card workout program, term extension | 5 years |

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