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Allowance for credit losses - Troubled debt restructuring according to their accruing status (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable    
Troubled debt restructurings $ 1,693,102 $ 1,656,822
Accruing    
Financing Receivable    
Troubled debt restructurings 1,515,522 1,468,966
Non-Accruing    
Financing Receivable    
Troubled debt restructurings 177,580 187,856
Mortgages    
Financing Receivable    
Troubled debt restructurings 1,252,911 1,255,713
Mortgages | Accruing    
Financing Receivable    
Troubled debt restructurings 1,151,887 1,143,204
Mortgages | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 101,024 112,509
Commercial    
Financing Receivable    
Troubled debt restructurings 369,129 326,088
Commercial | Accruing    
Financing Receivable    
Troubled debt restructurings 302,795 261,344
Commercial | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 66,334 64,744
Leasing    
Financing Receivable    
Troubled debt restructurings 216 372
Leasing | Accruing    
Financing Receivable    
Troubled debt restructurings 188 325
Leasing | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 28 47
Consumer    
Financing Receivable    
Troubled debt restructurings 70,846 74,649
Consumer | Accruing    
Financing Receivable    
Troubled debt restructurings 60,652 64,093
Consumer | Non-Accruing    
Financing Receivable    
Troubled debt restructurings 10,194 10,556
TDR    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 96,937 102,790
TDR | Mortgages    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 60,308 61,888
TDR | Commercial    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 21,007 24,736
TDR | Leasing    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 30 42
TDR | Consumer    
Financing Receivable    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 15,592 $ 16,124