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v3.10.0.1

Loans (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) grade | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) grade | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance - purchased credit-impaired loans | $ 3,007,000 | $ 530,000 | $ 3,007,000 | $ 530,000 | $ 3,200,000
Provision expense (credit) for loan and lease losses | 1,800,000 | (100,000) | 2,600,000 | (200,000) |
Financing receivable, modifications, recorded investment | $ 217,600,000 |  | $ 217,600,000 |  | 234,400,000
Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 24.00% |  |
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% |  |
Permanent Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance - purchased credit-impaired loans | $ 0 | 0 | $ 0 | 0 |
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 |  |
Consumer Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 23.00% |  |
Allowance - purchased credit-impaired loans | $ 640,000 | $ 384,000 | $ 640,000 | $ 384,000 |
TDRS maturities |  |  | 30 years |  |
Credit card |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Credit card workout program, granted rate reduction | 0.00% |  | 0.00% |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Valuation allowance | $ 31,500,000 |  | $ 31,500,000 |  | $ 37,300,000
Ratio of the allowance for loan losses to loans | 14.00% |  | 14.00% |  | 16.00%
Loans Held-For-Sale |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 60,500,000 |  | $ 60,500,000 |  | $ 63,200,000
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 |  |
Minimum | Permanent Mortgage |  |  |  |  |
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 |  |
Maximum | Heloc And Real Estate Installment Classes |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified interest rate time period |  |  | 5 years |  |
Maximum | Permanent Mortgage |  |  |  |  |
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 |  |
Commercial Loan P D Grade One |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Lowest expected default probability | grade | 1 |  | 1 |  |
Pass | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | grade | 1 |  | 1 |  |
Pass | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | grade | 12 |  | 12 |  |
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 |  |
Unlikely to be Collected Financing Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | grade | 16 |  | 16 |  |
Unlikely to be Collected Financing Receivable | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | grade | 16 |  | 16 |  |
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 |  |
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 | grade | 1 |  | 1 |  |
Commercial Loan L G D Grade Twelve | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan grades | grade | 12 |  | 12 |  |
Commercial Portfolio Segment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 20,575,101,000 |  | $ 20,575,101,000 |  | 20,271,968,000
Allowance - purchased credit-impaired loans | 2,280,000 |  | 2,280,000 |  | 2,813,000
Commercial Portfolio Segment | Finance And Insurance Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loans | $ 2,800,000,000 |  | $ 2,800,000,000 |  |
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 | $ 2,354,836,000 |  | $ 2,354,836,000 |  | $ 2,099,961,000
Percentage of commercial & industrial loan portfolio | 14.00% |  | 14.00% |  |
Percentage contributed in total loan | 9.00% |  | 9.00% |  |
Commercial Portfolio Segment | Finance Insurance And Loans To Mortgage Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of commercial & industrial loan portfolio | 31.00% |  | 31.00% |  |
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 |  |

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