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Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable    
Troubled debt restructurings $ 1,649,158 $ 1,656,822
Accruing    
Financing Receivable    
Troubled debt restructurings 1,486,072 1,468,966
Non-Accruing    
Financing Receivable    
Troubled debt restructurings 163,086 187,856
Mortgages    
Financing Receivable    
Troubled debt restructurings 1,253,778 1,255,713
Mortgages | Accruing    
Financing Receivable    
Troubled debt restructurings 1,160,469 1,143,204
Mortgages | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 93,309 112,509
Commercial    
Financing Receivable    
Troubled debt restructurings 328,261 326,088
Commercial | Accruing    
Financing Receivable    
Troubled debt restructurings 267,762 261,344
Commercial | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 60,499 64,744
Leasing    
Financing Receivable    
Troubled debt restructurings 189 372
Leasing | Accruing    
Financing Receivable    
Troubled debt restructurings 151 325
Leasing | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 38 47
Consumer    
Financing Receivable    
Troubled debt restructurings 66,930 74,649
Consumer | Accruing    
Financing Receivable    
Troubled debt restructurings 57,690 64,093
Consumer | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 9,240 10,556
TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 99,274 102,790
TDR | Mortgages    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 62,587 61,888
TDR | Commercial    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 22,112 24,736
TDR | Leasing    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 29 42
TDR | Consumer    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 14,546 $ 16,124