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Stock Options, Restricted Stock, and Dividend Reinvestment Plans (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted (in shares) | 1,238,754 |  |
Number of shares available for grant (in shares) | 7,927,593 |  |
Award vesting period | 3 years |  |
Value of annual equity awards to non employee directors | $ 65,000 | $ 65,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 1,483,323 | 971,328 | 595,229
Total intrinsic value of options exercised | $ 2,500,000 | $ 10,600,000 | $ 2,800,000
Grants in period, weighted average grant date fair value (in dollars per share) | $ 4.69 | $ 2.95 | $ 4.01
Stock-based compensation expense | $ 20,627,000 | $ 17,536,000 | $ 13,796,000
Total income tax benefits recognized | $ 7,900,000 | 6,700,000 | 5,300,000
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) | 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 | $ 27,600,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 6 months |  |
Total grant date fair value of shares vested | $ 9,900,000 | $ 9,700,000 | $ 9,900,000
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 | $ 2,200,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 3 years 2 months 12 days |  |
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) | 10,233,661 |  |
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 Two Thousand Fourteen |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Post vest holding period | 2 years |  |
Percent of performance condition achieved | 11250.00% |  |
Market Condition Award | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 7 years |  |
Market Condition Award | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 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 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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