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Commercial Loans - Summary of Activity in Allowance for Commercial Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Provision for loan losses $ 859 $ 60 $ 7,102 $ 115
Commercial Loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 859 7,401 7,102 7,456
Provision for loan losses (859) (60) (7,102) (115)
Balance at End of Period $ 0 $ 7,341 $ 0 $ 7,341