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Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable    
Troubled debt restructurings $ 1,656,822 $ 1,668,368
TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 102,790 113,309
Non-Accruing    
Financing Receivable    
Troubled debt restructurings 187,856 273,830
Accruing    
Financing Receivable    
Troubled debt restructurings 1,468,966 1,394,538
Construction    
Financing Receivable    
Troubled debt restructurings 0 21,497
Construction | TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 4,397
Construction | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 0 21,497
Construction | Accruing    
Financing Receivable    
Troubled debt restructurings 0 0
Mortgages    
Financing Receivable    
Troubled debt restructurings 1,255,713 1,195,965
Mortgages | TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 61,888 71,018
Mortgages | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 112,509 135,772
Mortgages | Accruing    
Financing Receivable    
Troubled debt restructurings 1,143,204 1,060,193
Commercial    
Financing Receivable    
Troubled debt restructurings 326,088 362,797
Commercial | TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 24,736 15,236
Commercial | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 64,744 103,551
Commercial | Accruing    
Financing Receivable    
Troubled debt restructurings 261,344 259,246
Leasing    
Financing Receivable    
Troubled debt restructurings 372 610
Leasing | TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 42 150
Leasing | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 47 218
Leasing | Accruing    
Financing Receivable    
Troubled debt restructurings 325 392
Consumer    
Financing Receivable    
Troubled debt restructurings 74,649 87,499
Consumer | TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 16,124 22,508
Consumer | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 10,556 12,792
Consumer | Accruing    
Financing Receivable    
Troubled debt restructurings $ 64,093 $ 74,707