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Loans and allowance for loan losses (Impaired Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Totals: Recorded Investment $ 4,086 $ 4,817
Totals: Unpaid Principal Balance 4,590 5,279
Totals: Related Allowance   4
Totals: Average Recorded Investment 4,453 4,944
Totals: Interest Income Recognized 221 286
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
With No Related Allowance Recorded: Recorded Investment 17 341
With No Related Allowance Recorded: Unpaid Principal Balance 67 341
With No Related Allowance Recorded: Average Recorded Investment 179 405
With No Related Allowance Recorded: Interest Income Recognized 5 30
With An Allowance Recorded: Recorded Investment   4
With An Allowance Recorded: Unpaid Principal Balance   4
With An Allowance Recorded: Average Recorded Investment 2 6
Totals: Recorded Investment 17 345
Totals: Unpaid Principal Balance 67 345
Totals: Related Allowance   4
Totals: Average Recorded Investment 181 411
Totals: Interest Income Recognized 5 30
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
With No Related Allowance Recorded: Recorded Investment 2,592 2,143
With No Related Allowance Recorded: Unpaid Principal Balance 2,971 2,496
With No Related Allowance Recorded: Average Recorded Investment 2,368 2,305
With No Related Allowance Recorded: Interest Income Recognized 154 135
With An Allowance Recorded: Average Recorded Investment   6
Totals: Recorded Investment 2,592 2,143
Totals: Unpaid Principal Balance 2,971 2,496
Totals: Average Recorded Investment 2,368 2,311
Totals: Interest Income Recognized 154 135
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
With No Related Allowance Recorded: Recorded Investment 102 639
With No Related Allowance Recorded: Unpaid Principal Balance 102 677
With No Related Allowance Recorded: Average Recorded Investment 371 601
With No Related Allowance Recorded: Interest Income Recognized 13 43
With An Allowance Recorded: Average Recorded Investment   7
Totals: Recorded Investment 102 639
Totals: Unpaid Principal Balance 102 677
Totals: Average Recorded Investment 371 608
Totals: Interest Income Recognized 13 43
Consumer [Member] | Consumer Secured [Member]    
Financing Receivable, Impaired [Line Items]    
With No Related Allowance Recorded: Recorded Investment 59 343
With No Related Allowance Recorded: Unpaid Principal Balance 60 346
With No Related Allowance Recorded: Average Recorded Investment 201 225
With No Related Allowance Recorded: Interest Income Recognized 2 16
Totals: Recorded Investment 59 343
Totals: Unpaid Principal Balance 60 346
Totals: Average Recorded Investment 201 225
Totals: Interest Income Recognized 2 16
Residential [Member] | Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
With No Related Allowance Recorded: Recorded Investment 1,316 1,347
With No Related Allowance Recorded: Unpaid Principal Balance 1,390 1,415
With No Related Allowance Recorded: Average Recorded Investment 1,332 1,319
With No Related Allowance Recorded: Interest Income Recognized 47 62
With An Allowance Recorded: Average Recorded Investment   70
Totals: Recorded Investment 1,316 1,347
Totals: Unpaid Principal Balance 1,390 1,415
Totals: Average Recorded Investment 1,332 1,389
Totals: Interest Income Recognized $ 47 $ 62