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Stock Options, Restricted Stock, and Dividend Reinvestment Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) plan $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of plans | plan | 1 |  |
Options granted (in shares) | shares | 1,761,343 |  |
Number of shares available for grant (in shares) | shares | 4,961,854 |  |
Award vesting period | 3 years |  |
Payment deferral period | 2 years |  |
Percent of performance condition achieved | 100.00% |  |
Value of annual equity awards to non employee directors | $ 65,000 | $ 65,000 |
Total intrinsic value of options exercised | $ 4,400,000 | $ 3,000,000.0 | $ 2,500,000
Stock options granted or converted (in shares) | shares | 530,787 | 394,296 | 1,483,323
Grants in period, weighted average grant date fair value (in dollars per share) | $ / shares | $ 2.69 | $ 3.89 | $ 4.69
Stock-based compensation expense | $ 22,730,000 | $ 23,171,000 | $ 20,627,000
Total income tax benefits recognized | $ 5,600,000 | 5,700,000 | 7,900,000
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 | $ 29,500,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 1 month 6 days |  |
Total grant date fair value of shares vested | $ 14,600,000 | $ 12,600,000 | $ 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 | $ 1,400,000 |  |
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 6 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 | 6,350,062 |  |
Performance Condition Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Duration of performance evaluation | 3 years | 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 | 10420.00% |  |
Performance Condition Awards | Units Granted In Two Thousand Fifteen |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Post vest holding period | 2 years |  |
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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