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Stock Options, Restricted Stock, and Dividend Reinvestment Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of plans | plan | 1 |  |
Options granted (in shares) | shares | 1,260,143 |  |
Number of shares available for grant (in shares) | shares | 6,810,413 |  |
Award vesting period | 3 years |  |
Payment deferral period | 2 years |  |
Value of annual equity awards to non employee directors | $ 65,000 | $ 65,000 |
Total intrinsic value of options exercised | $ 3,000,000 | $ 2,500,000 | $ 10,600,000
Stock options granted or converted (in shares) | shares | 394,296 | 1,483,323 | 971,328
Grants in period, weighted average grant date fair value (in dollars per share) | $ / shares | $ 3.89 | $ 4.69 | $ 2.95
Stock-based compensation expense | $ 23,171,000 | $ 20,627,000 | $ 17,536,000
Total income tax benefits recognized | $ 5,700,000 | 7,900,000 | 6,700,000
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 1 year |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 4 years |  |
Stock Appreciation Rights (SARs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted (in shares) | shares | 0 |  |
Nonvested Restricted Stock Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized | $ 27,800,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 3 months |  |
Total grant date fair value of shares vested | $ 12,600,000 | $ 9,900,000 | $ 9,700,000
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized | $ 1,800,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 9 months |  |
Expiration period | 20 years |  |
Equity Compensation Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant (in shares) | shares | 8,729,408 |  |
Performance Condition Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Duration of performance evaluation |  | 3 years | 3 years
Performance Condition Awards | PSUs Granted After 2014 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Post vest holding period | 2 years |  |
Percent of performance condition achieved | 10830.00% |  |
Market Condition Award | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 7 years |  |
Dividend Reinvestment Plan | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Quarterly value of shares available for purchase under dividend reinvestment and stock purchase plan | $ 25 |  |
Dividend Reinvestment Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Quarterly value of shares available for purchase under dividend reinvestment and stock purchase plan | $ 10,000 |  |
Capital Bank Financial Corporation | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Options Granted Since 2008 | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 7 years |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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