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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | $ 6,679 | $ 11,323
Recorded investment with no allowance | 5,388 | 6,656
Recorded investment with an allowance | 67 | 3,934
Related allowance | 67 | 776
Quarter-to-date average recorded investment | 6,429 | 10,886
Year-to-date average recorded investment | 8,963 | 13,501
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 6,997 | 7,501
Recorded investment with no allowance | 5,130 | 5,372
Recorded investment with an allowance | 1,867 | 2,129
Related allowance | 146 | 199
Quarter-to-date average recorded investment | 7,152 | 7,531
Year-to-date average recorded investment | 7,306 | 7,699
Interest income recognized | 267 | 306
Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 804 | 1,326
Recorded investment with no allowance | 804 | 1,326
Quarter-to-date average recorded investment | 801 | 1,172
Year-to-date average recorded investment | 1,183 | 732
Interest income recognized | 7 | 10
Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 14,480 | 20,150
Recorded investment with no allowance | 11,322 | 13,354
Recorded investment with an allowance | 1,934 | 6,063
Related allowance | 213 | 975
Quarter-to-date average recorded investment | 14,382 | 19,589
Year-to-date average recorded investment | 17,452 | 21,932
Interest income recognized | 274 | 316
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 1,665 | 2,660
Recorded investment with no allowance | 1,585 | 678
Recorded investment with an allowance |  | 1,797
Related allowance |  | 215
Quarter-to-date average recorded investment | 1,861 | 2,052
Year-to-date average recorded investment | 2,648 | 2,691
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 3,845 | 4,041
Recorded investment with no allowance | 2,617 | 2,583
Recorded investment with an allowance | 1,228 | 1,458
Related allowance | 135 | 180
Quarter-to-date average recorded investment | 3,857 | 4,052
Year-to-date average recorded investment | 3,920 | 4,157
Interest income recognized | 160 | 171
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 292 | 556
Recorded investment with no allowance | 292 | 556
Quarter-to-date average recorded investment | 269 | 786
Year-to-date average recorded investment | 362 | 337
Interest income recognized | 2 | 5
Residential Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 5,802 | 7,257
Recorded investment with no allowance | 4,494 | 3,817
Recorded investment with an allowance | 1,228 | 3,255
Related allowance | 135 | 395
Quarter-to-date average recorded investment | 5,987 | 6,890
Year-to-date average recorded investment | 6,930 | 7,185
Interest income recognized | 162 | 176
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 4,288 | 8,242
Recorded investment with no allowance | 3,220 | 5,680
Recorded investment with an allowance | 67 | 2,137
Related allowance | 67 | 561
Quarter-to-date average recorded investment | 3,971 | 8,533
Year-to-date average recorded investment | 5,669 | 9,421
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 3,118 | 3,419
Recorded investment with no allowance | 2,479 | 2,748
Recorded investment with an allowance | 639 | 671
Related allowance | 11 | 19
Quarter-to-date average recorded investment | 3,261 | 3,438
Year-to-date average recorded investment | 3,349 | 3,496
Interest income recognized | 104 | 125
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 512 | 770
Recorded investment with no allowance | 512 | 770
Quarter-to-date average recorded investment | 532 | 297
Year-to-date average recorded investment | 774 | 336
Interest income recognized | 5 | 4
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 7,918 | 12,431
Recorded investment with no allowance | 6,211 | 9,198
Recorded investment with an allowance | 706 | 2,808
Related allowance | 78 | 580
Quarter-to-date average recorded investment | 7,764 | 12,268
Year-to-date average recorded investment | 9,792 | 13,253
Interest income recognized | 109 | 129
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 401 | 421
Recorded investment with no allowance | 258 | 298
Quarter-to-date average recorded investment | 272 | 301
Year-to-date average recorded investment | 390 | 313
Commercial Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Quarter-to-date average recorded investment |  | 89
Year-to-date average recorded investment | 13 | 38
Interest income recognized |  | 1
Commercial Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 401 | 421
Recorded investment with no allowance | 258 | 298
Quarter-to-date average recorded investment | 272 | 390
Year-to-date average recorded investment | 403 | 351
Interest income recognized |  | 1
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 | 28 |
Year-to-date average recorded investment | 9 |
Consumer Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Year-to-date average recorded investment | 9 | 3
Consumer Portfolio Segment [Member] | Impaired 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 | 28 |
Year-to-date average recorded investment | 18 | 3
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 |
Recorded investment with no allowance | 297 |
Quarter-to-date average recorded investment | 297 |
Year-to-date average recorded investment | 247 | 1,076
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 | 34 | 41
Recorded investment with no allowance | 34 | 41
Quarter-to-date average recorded investment | 34 | 41
Year-to-date average recorded investment | 37 | 46
Interest income recognized | 3 | 10
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 | 25 | 18
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 331 | 41
Recorded investment with no allowance | 331 | 41
Quarter-to-date average recorded investment | 331 | 41
Year-to-date average recorded investment | 309 | 1,140
Interest income recognized | $ 3 | $ 10

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