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Allowance for credit losses - Activity in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses        
Balance at beginning of period $ 918,434 $ 543,666 $ 477,708 $ 569,348
Provision (reversal) for loan losses 19,138 36,539 271,318 118,555
Balance at end of period $ 925,850 512,365 $ 925,850 512,365
ASC Subtopic 310-30        
Financing Receivable, Allowance for Credit Losses        
Balance at beginning of period   120,818   122,135
Provision (reversal) for loan losses   (14,617)   (2,007)
Net charge-offs   (11,591)   (25,518)
Balance at end of period   $ 94,610   $ 94,610