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Fair value of financial instruments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mortgage Loans          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Net (losses) gains from fair value changes of mortgage loans $ (3,291) $ 3,212 $ (2,329) $ 7,409  
GNMA          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Delinquent GNMA loans that had been previously sold $ 28,897   $ 28,897   $ 67,362