Debt - 2020 Subordinated Notes (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended
Jun. 30, 2010
Dec. 31, 2014
May 02, 2013
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]          
Subordinated notes fixed interest rate 20.00% 10.00%      
2020 subordinated notes, net of discount          
Debt Instrument [Line Items]          
Consideration paid, subordinated notes     $ 17,500,000    
Subordinated notes fixed interest rate     6.00%    
Subordinated notes maturity, years     Nov. 02, 2020    
Increase in interest rate, until maturity period     8.00%    
Interest payable due date     3/31/2015    
Quarterly payment of principal     1,000,000    
Weighted average interest rate (as a percent)   6.00%   6.00%  
2020 subordinated notes, net of discount | Subordinated Notes          
Debt Instrument [Line Items]          
Estimated fair value of subordinated notes   15,900,000      
Interest rate   9.00%      
Debt outstanding   16,500,000     16,200,000
Debt instrument, face amount   17,500,000     17,500,000
Debt instrument, unamortized discount   1,000,000     $ 1,300,000