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Stock-Based Compensation Plans and Employee Benefits (Directors' Awards) (Details) - Directors
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity award granted (in shares) 67,631
Equity award grant date fair value (in dollars per share) | $ / shares $ 10.65
Equity award vesting period 1 year
CSE  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity award granted (in shares) 1,364
Equity award grant date fair value (in dollars per share) | $ / shares $ 11.19
CSE and Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested, outstanding (in shares) 238,360
Aggregate intrinsic value for directors | $ $ 2.7