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Summary of Significant Accounting and Reporting Policies - Other Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 09, 2015
Nov. 30, 2013
Debt Instrument          
Debt issuance costs amortized $ 0.4   $ 2.3    
FDIC Indemnification Asset          
Threshold amount of cumulative net losses over the life of the loss-share agreements which will reduce the FDIC Indemnification Asset 240.4        
Advertising          
Advertising Expense $ 4.6 $ 4.6 $ 5.3    
Senior exchangeable notes 7.50 percent due 2025          
Debt Instrument          
Interest rate (as a percent)         7.50%
Unamortized finance costs         $ 2.1
Senior Notes 5.00 Percent Due 2025 | Private Placement          
Debt Instrument          
Capitalized debt issuance costs       $ 1.9  
Interest rate (as a percent)       5.00%