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Allowance for loan losses - Activity in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses        
Balance at beginning of period $ 550,628 $ 640,578 $ 569,348 $ 623,426
Provision (reversal) for loan losses 40,191 60,054 82,016 131,117
Charge-offs (67,988) (73,641) (147,829) (141,457)
Balance at end of period 543,666 643,018 543,666 643,018
ASC Subtopic 310-30        
Financing Receivable, Allowance for Credit Losses        
Balance at beginning of period 124,147 146,120 122,135 119,505
Provision (reversal) for loan losses 4,884 23,129 12,610 60,464
Charge-offs (8,213) (12,921) (13,927) (23,641)
Balance at end of period $ 120,818 $ 156,328 $ 120,818 $ 156,328