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Loans - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance - purchased credit-impaired loans | $ 3,398,000 | $ 3,135,000 | $ 3,398,000 | $ 3,135,000 | $ 3,200,000
Provision expense (credit) for loan and lease losses | 900,000 | $ 2,600,000 | 3,500,000 | $ 2,400,000 |
Financing receivable, modifications, recorded investment | $ 236,500,000 |  | $ 236,500,000 |  | 234,400,000
Commercial Loan P D Grade One |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Lowest expected default probability | 1 |  | 1 |  |
Pass | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 1 |  | 1 |  |
Pass | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 12 |  | 12 |  |
Special Mention |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 13 |  | 13 |  |
Special Mention | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 13 |  | 13 |  |
Unlikely to be Collected Financing Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 16 |  | 16 |  |
Unlikely to be Collected Financing Receivable | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 16 |  | 16 |  |
Substandard |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 14 |  | 14 |  |
Doubtful |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 15 |  | 15 |  |
Loan Reassessed | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 1,000,000 |  | $ 1,000,000 |  |
Commercial Loan P D Grade Thirteen | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 500,000 |  | $ 500,000 |  |
Commercial Loan L G D Grade One | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 1 |  | 1 |  |
Commercial Loan L G D Grade Twelve | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | 12 |  | 12 |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Valuation allowance | $ 28,400,000 |  | $ 28,400,000 |  | $ 37,300,000
Ratio of the allowance for loan losses to loans | 12.00% |  | 12.00% |  | 16.00%
Loans Held-For-Sale |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 57,900,000 |  | $ 57,900,000 |  | $ 63,200,000
Consumer Portfolio Segment | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 24.00% |  |
Commercial Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | 20,281,181,000 |  | $ 20,281,181,000 |  | 20,271,968,000
Allowance - purchased credit-impaired loans | 1,926,000 |  | $ 1,926,000 |  | 2,813,000
Commercial Portfolio Segment | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forbearance agreements time period |  |  | 6 months |  |
Commercial Portfolio Segment | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forbearance agreements time period |  |  | 12 months |  |
Commercial Portfolio Segment | Finance And Insurance Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 2,700,000,000 |  | $ 2,700,000,000 |  |
Percentage of commercial & industrial loan portfolio | 17.00% |  | 17.00% |  |
Percentage contributed in total loan | 10.00% |  | 10.00% |  |
Commercial Portfolio Segment | Loans to Mortgage Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 2,092,366,000 |  | $ 2,092,366,000 |  | $ 2,099,961,000
Percentage of commercial & industrial loan portfolio | 13.00% |  | 13.00% |  |
Percentage contributed in total loan | 8.00% |  | 8.00% |  |
Commercial Portfolio Segment | Finance Insurance And Loans To Mortgage Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 30.00% |  | 30.00% |  |
Consumer real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 23.00% |  |
TDRS maturities |  |  | 30 years |  |
Consumer real estate | 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% |  |
Consumer real estate | Heloc And Real Estate Installment Classes | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified interest rate | 1.00% |  | 1.00% |  |
Modified interest rate time period |  |  | 5 years |  |
Consumer real estate | Heloc And Real Estate Installment Classes | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified interest rate time period |  |  | 5 years |  |
Credit Card And Other Portfolio Segment | Credit card |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Credit card workout program, granted rate reduction | 0.00% |  | 0.00% |  |
Credit Card And Other Portfolio Segment | Credit card | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payment reductions, time period |  |  | 6 months |  |
Credit Card And Other Portfolio Segment | Credit card | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Payment reductions, time period |  |  | 1 year |  |
Credit card workout program, term extension |  |  | 5 years |  |
Permanent mortgage |  |  |  |  |
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 | 1.00% |  | 1.00% |  |
TDRS maturities |  |  | 40 years |  |
Permanent mortgage | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified interest rate | 2.00% |  | 2.00% |  |
Modified interest rate time period |  |  | 5 years |  |
Permanent mortgage | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified interest rate time period |  |  | 5 years |  |

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