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Fair value of financial instruments - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Equity securities without readily determinable fair value, amount reclassed       $ 3,604
Impairment of equity securities $ 0 $ 945    
Mortgage Loans        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Net (losses) gains from fair value changes of mortgage loans (4,539) 9,111 $ (2,289)  
GNMA        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Delinquent GNMA loans that had been previously sold 67,362      
Mortgage loans held for sale measured at fair value $ 0 $ 43,035