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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 |

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