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Allowance for credit losses - Troubled debt restructurings loan count by type of modification (Details) - loans
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Financing Receivable    
Loan count 420 587
Reduction in interest rate    
Financing Receivable    
Loan count 43 127
Extension of maturity date    
Financing Receivable    
Loan count 61 81
Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 288 365
Other    
Financing Receivable    
Loan count 28 14
Mortgages    
Financing Receivable    
Loan count 324 408
Mortgages | Reduction in interest rate    
Financing Receivable    
Loan count 1 8
Mortgages | Extension of maturity date    
Financing Receivable    
Loan count 34 40
Mortgages | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 288 360
Mortgages | Other    
Financing Receivable    
Loan count 1 0
Commercial | Commercial multi-family    
Financing Receivable    
Loan count   1
Commercial | Commercial multi-family | Reduction in interest rate    
Financing Receivable    
Loan count   0
Commercial | Commercial multi-family | Extension of maturity date    
Financing Receivable    
Loan count   1
Commercial | Commercial multi-family | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count   0
Commercial | Commercial multi-family | Other    
Financing Receivable    
Loan count   0
Commercial | CRE non-owner occupied    
Financing Receivable    
Loan count 1 9
Commercial | CRE non-owner occupied | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Commercial | CRE non-owner occupied | Extension of maturity date    
Financing Receivable    
Loan count 0 9
Commercial | CRE non-owner occupied | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 0
Commercial | CRE non-owner occupied | Other    
Financing Receivable    
Loan count 1 0
Commercial | CRE owner occupied    
Financing Receivable    
Loan count 2 22
Commercial | CRE owner occupied | Reduction in interest rate    
Financing Receivable    
Loan count 1 2
Commercial | CRE owner occupied | Extension of maturity date    
Financing Receivable    
Loan count 1 20
Commercial | CRE owner occupied | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 0
Commercial | CRE owner occupied | Other    
Financing Receivable    
Loan count 0 0
Commercial | Commercial and Industrial    
Financing Receivable    
Loan count 17 8
Commercial | Commercial and Industrial | Reduction in interest rate    
Financing Receivable    
Loan count 1 0
Commercial | Commercial and Industrial | Extension of maturity date    
Financing Receivable    
Loan count 5 8
Commercial | Commercial and Industrial | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 0
Commercial | Commercial and Industrial | Other    
Financing Receivable    
Loan count 11 0
Consumer | Credit card    
Financing Receivable    
Loan count 30 66
Consumer | Credit card | Reduction in interest rate    
Financing Receivable    
Loan count 15 52
Consumer | Credit card | Extension of maturity date    
Financing Receivable    
Loan count 0 0
Consumer | Credit card | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 0
Consumer | Credit card | Other    
Financing Receivable    
Loan count 15 14
Consumer | Home equity lines of credit    
Financing Receivable    
Loan count   1
Consumer | Home equity lines of credit | Reduction in interest rate    
Financing Receivable    
Loan count   0
Consumer | Home equity lines of credit | Extension of maturity date    
Financing Receivable    
Loan count   0
Consumer | Home equity lines of credit | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count   1
Consumer | Home equity lines of credit | Other    
Financing Receivable    
Loan count   0
Consumer | Personal loans    
Financing Receivable    
Loan count 45 64
Consumer | Personal loans | Reduction in interest rate    
Financing Receivable    
Loan count 25 61
Consumer | Personal loans | Extension of maturity date    
Financing Receivable    
Loan count 20 2
Consumer | Personal loans | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 1
Consumer | Personal loans | Other    
Financing Receivable    
Loan count 0 0
Consumer | Auto Loan    
Financing Receivable    
Loan count 1 3
Consumer | Auto Loan | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Consumer | Auto Loan | Extension of maturity date    
Financing Receivable    
Loan count 1 1
Consumer | Auto Loan | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 2
Consumer | Auto Loan | Other    
Financing Receivable    
Loan count 0 0
Consumer | Other    
Financing Receivable    
Loan count   4
Consumer | Other | Reduction in interest rate    
Financing Receivable    
Loan count   4
Consumer | Other | Extension of maturity date    
Financing Receivable    
Loan count   0
Consumer | Other | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count   0
Consumer | Other | Other    
Financing Receivable    
Loan count   0
Leasing    
Financing Receivable    
Loan count   1
Leasing | Reduction in interest rate    
Financing Receivable    
Loan count   0
Leasing | Extension of maturity date    
Financing Receivable    
Loan count   0
Leasing | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count   1
Leasing | Other    
Financing Receivable    
Loan count   0