v3.3.0.814
Borrowings - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Overnight FHLB advances $ 660.0 $ 263.0
Term notes payable   $ 19.9
FHLB advances interest rates 0.20% 0.27%