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Loans (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) grade | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2017 USD ($) | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held-for-sale | [1] | $ 699,377,000 | $ 111,248,000 |  |  |
Allowance - purchased credit-impaired loans |  | 3,168,000 | 723,000 | $ 1,682,000 |  |
Troubled debt restructurings loans |  | 234,400,000 | 285,200,000 |  |  |
Less: Allowance for loan losses |  | 189,555,000 | 202,068,000 | 210,242,000 |  | $ 232,448,000
Average balance of impaired loans |  | 270,740,000 | 310,368,000 |  |  |
Interest income recognized on impaired loan |  | 6,808,000 | 6,779,000 |  |  |
Provision for loan losses |  | 0 | 11,000,000 | 9,000,000 |  |
C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance - purchased credit-impaired loans |  | 2,809,000 | 164,000 | 14,000 |  |
Less: Allowance for loan losses |  | 98,211,000 | 89,398,000 | 73,637,000 |  | $ 67,011,000
Provision for loan losses |  | 21,902,000 | 27,426,000 | $ 15,693,000 |  |
Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged to secure potential borrowings |  | 4,600,000,000 |  |  |  |
Allowance - purchased credit-impaired loans |  | 2,813,000 | 319,000 |  |  |
Commercial loans |  | 20,271,968,000 | 14,283,610,000 |  |  |
Less: Allowance for loan losses |  | 126,638,000 | 123,250,000 |  |  |
Average balance of impaired loans |  | 42,933,000 | 52,779,000 |  |  |
Interest income recognized on impaired loan |  | $ 835,000 | 994,000 |  |  |
Permanent Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
TDR, reduction of interest rate by increment, basis points |  | 0.25% |  |  |  |
TDRS Maturities |  | 40 years |  |  |  |
Modified interest rate increase |  | 1.00% |  |  |  |
Consumer Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 23.00% |  |  |  |
TDRS Maturities |  | 30 years |  |  |  |
Loans Held-For-Sale |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Troubled debt restructurings loans |  | $ 63,200,000 | 69,300,000 |  |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 24.00% |  |  |  |
Allowance For TDRs To Recorded Investment Of TDRs |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan loss reserves |  | $ 37,300,000 | $ 44,900,000 |  |  |
Ratio of the allowance for loan losses to loans |  | 16.00% | 16.00% |  |  |
Loans To Mortgage Companies | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans |  | $ 2,100,000,000 |  |  |  |
Percentage of commercial & industrial loan portfolio |  | 13.00% |  |  |  |
Percentage contributed in total loan |  | 8.00% |  |  |  |
Loans To Mortgage Companies | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans |  | $ 2,099,961,000 | $ 2,045,189,000 |  |  |
Credit Card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit card workout program, granted rate reduction |  | 0.00% |  |  |  |
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% |  |  |  |
Modified interest rate increase |  | 2.00% |  |  |  |
Finance And Insurance Companies | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans |  | $ 2,900,000,000 |  |  |  |
Percentage of commercial & industrial loan portfolio |  | 18.00% |  |  |  |
Percentage contributed in total loan |  | 10.00% |  |  |  |
Finance Insurance And Loans To Mortgage Companies | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 31.00% |  |  |  |
TRUPs |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan loss reserves |  | $ 25,500,000 | 25,500,000 |  |  |
TRUPs | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans |  | 306,915,000 | 307,445,000 |  |  |
Loan loss reserves |  | $ 25,500,000 | 25,500,000 |  |  |
Maximum | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Forbearance agreements time period |  | 12 months |  |  |  |
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 |  |  |  |
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 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Forbearance agreements time period |  | 6 months |  |  |  |
Minimum | Permanent Mortgage |  |  |  |  |  |
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 | grade |  | 12 |  |  |  |
Pass | Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 1 |  |  |  |
Special Mention |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 13 |  |  |  |
Special Mention | Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 13 |  |  |  |
Substandard |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 14 |  |  |  |
Doubtful |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 15 |  |  |  |
Loss |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 16 |  |  |  |
Loss | Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 16 |  |  |  |
PD Grade 1 |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Lowest expected default probability | grade |  | 1 |  |  |  |
PD Grade 1 | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for loan losses |  | $ 70,000 | 77,000 |  |  |
PD Grade 12 | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for loan losses |  | 5,882,000 | 6,377,000 |  |  |
PD Grade 13 | Commercial Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: Allowance for loan losses |  | 7,265,000 | 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 | grade |  | 1 |  |  |  |
LGD Grade 12 | Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loan grades | grade |  | 12 |  |  |  |
Loan Reassessed | Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial loans |  | $ 1,000,000 |  |  |  |
PCI Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Provision for loan losses |  | 2,500,000 | 500,000 |  |  |
Allowance for Loan and Lease Losses Write-offs, Net |  | $ 100,000 | $ 400,000 |  |  |
Capital Bank Financial Corporation |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  |  | $ 132,800,000 |
Fair value of loans acquired |  |  |  |  | 7,400,000,000 |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  | 7,600,000,000 |
Capital Bank Financial Corporation | PCI Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held-for-sale |  |  |  |  | $ 5,000,000 |
[1] | December 31, 2017 and 2016 include $11.7 million and $19.3 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.

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