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Pension, Savings, And Other Employee Benefits - Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) pension_plan | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, expected contributions by employer remainder of year | $ 5.2 |
Savings Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer investment in qualified defined contribution plan | 100.00% |
Maximum percent of employee pre-tax contributions that may be matched by the Company (percent) | 6.00% |
Qualified Plan | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated social security benefits age | 65 years |
Nonqualified Plan | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, contributions by employer |  | $ 5.8
Capital Bank Financial Corp | Qualified Plan | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of additional qualified pension plans | pension_plan | 2 |
Defined benefit plan, benefit obligation |  | 17.1
Defined benefit plan, fair value of plan assets |  | $ 16.5

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