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Pension, Savings, And Other Employee Benefits (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
pension_plan
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Estimated social security benefits age   65 years  
Number of additional qualified pension plans | pension_plan   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%  
Non-Qualified Plans | Pension and Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to qualified plans     $ 5.4
Expected pension contribution   $ 5.7  
Capital Bank Financial Corp      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to qualified plans $ 5.1    
Defined benefit plan, benefit obligation 18.7   18.7
Defined benefit plan, fair value of plan assets $ 18.6   $ 18.6