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Portfolio Loans and allowance for credit losses - Analysis of loans past due and still accruing or non-accrual status (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans past due    
90+Days $ 491 $ 1,371
Non-accrual Loans 25,369 22,930
30 to 59 Days    
Loans past due    
Loans past due, still accruing 4,224 6,794
60 to 89 Days    
Loans past due    
Loans past due, still accruing 2,222 784
Commercial    
Loans past due    
Non-accrual Loans 10,230 8,523
Commercial | 30 to 59 Days    
Loans past due    
Loans past due, still accruing 1,092 243
Commercial | 60 to 89 Days    
Loans past due    
Loans past due, still accruing 202  
Commercial real estate    
Loans past due    
Non-accrual Loans 6,620 5,503
Commercial real estate | 30 to 59 Days    
Loans past due    
Loans past due, still accruing 882  
Real estate construction    
Loans past due    
Non-accrual Loans   1
Real estate construction | 30 to 59 Days    
Loans past due    
Loans past due, still accruing   237
Real estate construction | 60 to 89 Days    
Loans past due    
Loans past due, still accruing   235
Retail Real Estate    
Loans past due    
90+Days 491 1,305
Non-accrual Loans 8,482 8,799
Retail Real Estate | 30 to 59 Days    
Loans past due    
Loans past due, still accruing 2,068 6,248
Retail Real Estate | 60 to 89 Days    
Loans past due    
Loans past due, still accruing 2,020 400
Retail Other    
Loans past due    
90+Days   66
Non-accrual Loans 37 104
Retail Other | 30 to 59 Days    
Loans past due    
Loans past due, still accruing $ 182 66
Retail Other | 60 to 89 Days    
Loans past due    
Loans past due, still accruing   $ 149