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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance $ 10,583   $ 10,583   $ 14,480
Recorded investment with no allowance 8,846   8,846   11,322
Recorded investment with an allowance 1,109   1,109   1,934
Related allowance 84   84   213
Quarter-to-date average recorded investment 10,197 $ 16,025      
Year-to-date average recorded investment     11,477 $ 18,475  
Interest income recognized     204 196  
Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,085   4,085   6,679
Recorded investment with no allowance 3,457   3,457   5,388
Recorded investment with an allowance         67
Related allowance         67
Quarter-to-date average recorded investment 3,636 7,465      
Year-to-date average recorded investment     4,200 9,808  
Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 5,750   5,750   6,997
Recorded investment with no allowance 4,641   4,641   5,130
Recorded investment with an allowance 1,109   1,109   1,867
Related allowance 84   84   146
Quarter-to-date average recorded investment 5,812 7,280      
Year-to-date average recorded investment     6,277 7,357  
Interest income recognized     187 192  
Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 748   748   804
Recorded investment with no allowance 748   748   804
Quarter-to-date average recorded investment 749 1,280      
Year-to-date average recorded investment     1,000 1,310  
Interest income recognized     17 4  
Residential Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 4,089   4,089   5,802
Recorded investment with no allowance 2,898   2,898   4,494
Recorded investment with an allowance 1,109   1,109   1,228
Related allowance 84   84   135
Quarter-to-date average recorded investment 4,158 6,581      
Year-to-date average recorded investment     4,956 7,243  
Interest income recognized     125 121  
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 899   899   1,665
Recorded investment with no allowance 817   817   1,585
Quarter-to-date average recorded investment 959 2,306      
Year-to-date average recorded investment     1,191 2,910  
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 2,863   2,863   3,845
Recorded investment with no allowance 1,754   1,754   2,617
Recorded investment with an allowance 1,109   1,109   1,228
Related allowance 84   84   135
Quarter-to-date average recorded investment 2,871 3,886      
Year-to-date average recorded investment     3,252 3,940  
Interest income recognized     118 120  
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 327   327   292
Recorded investment with no allowance 327   327   292
Quarter-to-date average recorded investment 328 389      
Year-to-date average recorded investment     513 393  
Interest income recognized     7 1  
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 5,785   5,785   7,918
Recorded investment with no allowance 5,397   5,397   6,211
Recorded investment with an allowance         706
Related allowance         78
Quarter-to-date average recorded investment 5,484 8,685      
Year-to-date average recorded investment     5,923 10,468  
Interest income recognized     77 73  
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 2,504   2,504   4,288
Recorded investment with no allowance 2,116   2,116   3,220
Recorded investment with an allowance         67
Related allowance         67
Quarter-to-date average recorded investment 2,150 4,498      
Year-to-date average recorded investment     2,459 6,235  
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 2,860   2,860   3,118
Recorded investment with no allowance 2,860   2,860   2,479
Recorded investment with an allowance         639
Related allowance         11
Quarter-to-date average recorded investment 2,913 3,357      
Year-to-date average recorded investment     2,994 3,379  
Interest income recognized     67 70  
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 421   421   512
Recorded investment with no allowance 421   421   512
Quarter-to-date average recorded investment 421 830      
Year-to-date average recorded investment     470 854  
Interest income recognized     10 3  
Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 385   385   401
Recorded investment with no allowance 227   227   258
Quarter-to-date average recorded investment 230 397      
Year-to-date average recorded investment     258 447  
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 385   385   401
Recorded investment with no allowance 227   227   258
Quarter-to-date average recorded investment 230 355      
Year-to-date average recorded investment     241 429  
Commercial Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Quarter-to-date average recorded investment   42      
Year-to-date average recorded investment     17 18  
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance         28
Recorded investment with no allowance         28
Quarter-to-date average recorded investment   28      
Year-to-date average recorded investment     12 15  
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance         28
Recorded investment with no allowance         28
Quarter-to-date average recorded investment   9      
Year-to-date average recorded investment     12 3  
Consumer Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Quarter-to-date average recorded investment   19      
Year-to-date average recorded investment       12  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 324   324   331
Recorded investment with no allowance 324   324   331
Quarter-to-date average recorded investment 325 334      
Year-to-date average recorded investment     328 302  
Interest income recognized     2 2  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 297   297   297
Recorded investment with no allowance 297   297   297
Quarter-to-date average recorded investment 297 297      
Year-to-date average recorded investment     297 231  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Unpaid principal balance 27   27   34
Recorded investment with no allowance 27   27   $ 34
Quarter-to-date average recorded investment $ 28 $ 37      
Year-to-date average recorded investment     31 38  
Interest income recognized     $ 2 2  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Year-to-date average recorded investment       $ 33