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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrecorded Unconditional Purchase Obligation      
Operating leases, rent expense $ 2.5 $ 1.9 $ 2.7
Construction Contracts      
Unrecorded Unconditional Purchase Obligation      
Commitments under construction contracts $ 1.1    
Related Entity      
Unrecorded Unconditional Purchase Obligation      
Ownership percentage in partnership 50.00%    
Obligation to repurchase loans sold      
Unrecorded Unconditional Purchase Obligation      
Amount of sold residential mortgage loans with recourse provisions $ 1.9 $ 2.7