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Allowance for loan losses - Activity in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of period $ 569,348 $ 623,426  
Provision (reversal) for loan losses 165,779 228,072 $ 325,424
Charge-offs (345,679) (352,622)  
Balance at end of period 477,708 569,348 623,426
ASC Subtopic 310-30      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of period 122,135 119,505  
Provision (reversal) for loan losses 1,119 61,270  
Charge-offs (49,215) (58,640)  
Balance at end of period $ 74,039 $ 122,135 $ 119,505