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Allowance for credit losses - Troubled debt restructurings loan count by type of modification (Details) - loans
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable    
Loan count 2,373 2,103
Reduction in interest rate    
Financing Receivable    
Loan count 372 1,025
Extension of maturity date    
Financing Receivable    
Loan count 313 177
Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1,604 340
Other    
Financing Receivable    
Loan count 84 561
Construction    
Financing Receivable    
Loan count   1
Construction | Reduction in interest rate    
Financing Receivable    
Loan count   0
Construction | Extension of maturity date    
Financing Receivable    
Loan count   1
Construction | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count   0
Construction | Other    
Financing Receivable    
Loan count   0
Mortgages    
Financing Receivable    
Loan count 1,774 813
Mortgages | Reduction in interest rate    
Financing Receivable    
Loan count 39 3
Mortgages | Extension of maturity date    
Financing Receivable    
Loan count 140 68
Mortgages | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1,590 331
Mortgages | Other    
Financing Receivable    
Loan count 5 411
Commercial | Commercial multi-family    
Financing Receivable    
Loan count 2 2
Commercial | Commercial multi-family | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Commercial | Commercial multi-family | Extension of maturity date    
Financing Receivable    
Loan count 1 2
Commercial | Commercial multi-family | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1 0
Commercial | Commercial multi-family | Other    
Financing Receivable    
Loan count 0 0
Commercial | CRE non-owner occupied    
Financing Receivable    
Loan count 12 13
Commercial | CRE non-owner occupied | Reduction in interest rate    
Financing Receivable    
Loan count 0 2
Commercial | CRE non-owner occupied | Extension of maturity date    
Financing Receivable    
Loan count 11 10
Commercial | CRE non-owner occupied | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1 0
Commercial | CRE non-owner occupied | Other    
Financing Receivable    
Loan count 0 1
Commercial | CRE owner occupied    
Financing Receivable    
Loan count 43 37
Commercial | CRE owner occupied | Reduction in interest rate    
Financing Receivable    
Loan count 4 0
Commercial | CRE owner occupied | Extension of maturity date    
Financing Receivable    
Loan count 23 37
Commercial | CRE owner occupied | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 4 0
Commercial | CRE owner occupied | Other    
Financing Receivable    
Loan count 12 0
Commercial | Commercial and Industrial    
Financing Receivable    
Loan count 39 53
Commercial | Commercial and Industrial | Reduction in interest rate    
Financing Receivable    
Loan count 5 3
Commercial | Commercial and Industrial | Extension of maturity date    
Financing Receivable    
Loan count 13 50
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 21 0
Consumer | Credit card    
Financing Receivable    
Loan count 178 752
Consumer | Credit card | Reduction in interest rate    
Financing Receivable    
Loan count 134 659
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 1 0
Consumer | Credit card | Other    
Financing Receivable    
Loan count 43 93
Consumer | Home equity lines of credit    
Financing Receivable    
Loan count 2 3
Consumer | Home equity lines of credit | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Consumer | Home equity lines of credit | Extension of maturity date    
Financing Receivable    
Loan count 1 2
Consumer | Home equity lines of credit | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1 1
Consumer | Home equity lines of credit | Other    
Financing Receivable    
Loan count 0 0
Consumer | Personal loans    
Financing Receivable    
Loan count 303 362
Consumer | Personal loans | Reduction in interest rate    
Financing Receivable    
Loan count 183 355
Consumer | Personal loans | Extension of maturity date    
Financing Receivable    
Loan count 117 5
Consumer | Personal loans | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 1 1
Consumer | Personal loans | Other    
Financing Receivable    
Loan count 2 1
Consumer | Auto Loan    
Financing Receivable    
Loan count 10 42
Consumer | Auto Loan | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Consumer | Auto Loan | Extension of maturity date    
Financing Receivable    
Loan count 7 2
Consumer | Auto Loan | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 3 2
Consumer | Auto Loan | Other    
Financing Receivable    
Loan count 0 38
Consumer | Other    
Financing Receivable    
Loan count 8 3
Consumer | Other | Reduction in interest rate    
Financing Receivable    
Loan count 7 3
Consumer | Other | Extension of maturity date    
Financing Receivable    
Loan count 0 0
Consumer | Other | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 0 0
Consumer | Other | Other    
Financing Receivable    
Loan count 1 0
Leasing    
Financing Receivable    
Loan count 2 22
Leasing | Reduction in interest rate    
Financing Receivable    
Loan count 0 0
Leasing | Extension of maturity date    
Financing Receivable    
Loan count 0 0
Leasing | Combination of reduction in interest rate and extension of maturity date    
Financing Receivable    
Loan count 2 5
Leasing | Other    
Financing Receivable    
Loan count 0 17