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Loans Receivable - Troubled Debt Restructuring (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
commitment
loan
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Financing Receivable, Modifications [Line Items]      
Carrying value of loan | $     $ 37.6
Carrying value of loans before allowance for loan losses | $ $ 37.8 $ 66.4  
Number of TDR contracts outstanding | commitment 1    
Number of lending commitments outstanding | loan 0    
Performing Financial Instruments      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 0 0 0