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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | $ 21,158 |  | $ 21,158 |  | $ 20,150
Recorded investment with no allowance | 14,793 |  | 14,793 |  | 13,354
Recorded investment with an allowance | 4,772 |  | 4,772 |  | 6,063
Related allowance | 346 |  | 346 |  | 975
Quarter-to-date average recorded investment | 19,833 | $ 22,591 |  |  |
Year-to-date average recorded investment |  |  | 19,699 | $ 23,192 |
Interest income recognized |  |  | 131 | 157 |
Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 13,242 |  | 13,242 |  | 11,323
Recorded investment with no allowance | 10,240 |  | 10,240 |  | 6,656
Recorded investment with an allowance | 1,409 |  | 1,409 |  | 3,934
Related allowance | 142 |  | 142 |  | 776
Quarter-to-date average recorded investment | 11,256 | 14,172 |  |  |
Year-to-date average recorded investment |  |  | 10,980 | 14,972 |
Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 7,312 |  | 7,312 |  | 7,501
Recorded investment with no allowance | 3,949 |  | 3,949 |  | 5,372
Recorded investment with an allowance | 3,363 |  | 3,363 |  | 2,129
Related allowance | 204 |  | 204 |  | 199
Quarter-to-date average recorded investment | 7,323 | 7,782 |  |  |
Year-to-date average recorded investment |  |  | 7,395 | 7,844 |
Interest income recognized |  |  | 127 | 155 |
Other Impaired Accruing Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 604 |  | 604 |  | 1,326
Recorded investment with no allowance | 604 |  | 604 |  | 1,326
Quarter-to-date average recorded investment | 1,254 | 637 |  |  |
Year-to-date average recorded investment |  |  | 1,324 | 376 |
Interest income recognized |  |  | 4 | 2 |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 8,209 |  | 8,209 |  | 7,257
Recorded investment with no allowance | 3,727 |  | 3,727 |  | 3,817
Recorded investment with an allowance | 4,048 |  | 4,048 |  | 3,255
Related allowance | 265 |  | 265 |  | 395
Quarter-to-date average recorded investment | 7,646 | 7,037 |  |  |
Year-to-date average recorded investment |  |  | 7,574 | 7,392 |
Interest income recognized |  |  | 80 | 81 |
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 4,250 |  | 4,250 |  | 2,660
Recorded investment with no allowance | 2,474 |  | 2,474 |  | 678
Recorded investment with an allowance | 1,342 |  | 1,342 |  | 1,797
Related allowance | 75 |  | 75 |  | 215
Quarter-to-date average recorded investment | 3,555 | 2,730 |  |  |
Year-to-date average recorded investment |  |  | 3,213 | 3,034 |
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 3,905 |  | 3,905 |  | 4,041
Recorded investment with no allowance | 1,199 |  | 1,199 |  | 2,583
Recorded investment with an allowance | 2,706 |  | 2,706 |  | 1,458
Related allowance | 190 |  | 190 |  | 180
Quarter-to-date average recorded investment | 3,912 | 4,219 |  |  |
Year-to-date average recorded investment |  |  | 3,967 | 4,263 |
Interest income recognized |  |  | 79 | 81 |
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 54 |  | 54 |  | 556
Recorded investment with no allowance | 54 |  | 54 |  | 556
Quarter-to-date average recorded investment | 179 | 88 |  |  |
Year-to-date average recorded investment |  |  | 394 | 95 |
Interest income recognized |  |  | 1 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 11,912 |  | 11,912 |  | 12,431
Recorded investment with no allowance | 10,160 |  | 10,160 |  | 9,198
Recorded investment with an allowance | 724 |  | 724 |  | 2,808
Related allowance | 81 |  | 81 |  | 580
Quarter-to-date average recorded investment | 11,279 | 13,660 |  |  |
Year-to-date average recorded investment |  |  | 11,360 | 13,265 |
Interest income recognized |  |  | 50 | 68 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 8,016 |  | 8,016 |  | 8,242
Recorded investment with no allowance | 6,921 |  | 6,921 |  | 5,680
Recorded investment with an allowance | 67 |  | 67 |  | 2,137
Related allowance | 67 |  | 67 |  | 561
Quarter-to-date average recorded investment | 6,853 | 9,613 |  |  |
Year-to-date average recorded investment |  |  | 7,103 | 9,466 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 3,369 |  | 3,369 |  | 3,419
Recorded investment with no allowance | 2,712 |  | 2,712 |  | 2,748
Recorded investment with an allowance | 657 |  | 657 |  | 671
Related allowance | 14 |  | 14 |  | 19
Quarter-to-date average recorded investment | 3,373 | 3,516 |  |  |
Year-to-date average recorded investment |  |  | 3,390 | 3,533 |
Interest income recognized |  |  | 47 | 66 |
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 527 |  | 527 |  | 770
Recorded investment with no allowance | 527 |  | 527 |  | 770
Quarter-to-date average recorded investment | 1,053 | 531 |  |  |
Year-to-date average recorded investment |  |  | 867 | 266 |
Interest income recognized |  |  | 3 | 2 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 702 |  | 702 |  | 421
Recorded investment with no allowance | 571 |  | 571 |  | 298
Quarter-to-date average recorded investment | 557 | 325 |  |  |
Year-to-date average recorded investment |  |  | 471 | 329 |
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 679 |  | 679 |  | 421
Recorded investment with no allowance | 548 |  | 548 |  | 298
Quarter-to-date average recorded investment | 551 | 314 |  |  |
Year-to-date average recorded investment |  |  | 466 | 319 |
Commercial Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 23 |  | 23 |  |
Recorded investment with no allowance | 23 |  | 23 |  |
Quarter-to-date average recorded investment | 6 | 11 |  |  |
Year-to-date average recorded investment |  |  | 5 | 10 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Quarter-to-date average recorded investment | 16 | 7 |  |  |
Year-to-date average recorded investment |  |  | 9 | 5 |
Consumer Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Quarter-to-date average recorded investment | 16 | 7 |  |  |
Year-to-date average recorded investment |  |  | 9 | 5 |
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 335 |  | 335 |  | 41
Recorded investment with no allowance | 335 |  | 335 |  | 41
Quarter-to-date average recorded investment | 335 | 1,562 |  |  |
Year-to-date average recorded investment |  |  | 285 | 2,201 |
Interest income recognized |  |  | 1 | 8 |
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 |  |
Recorded investment with no allowance | 297 |  | 297 |  |
Quarter-to-date average recorded investment | 297 | 1,515 |  |  |
Year-to-date average recorded investment |  |  | 198 | 2,153 |
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 | 38 |  | 38 |  | 41
Recorded investment with no allowance | 38 |  | 38 |  | $ 41
Quarter-to-date average recorded investment | $ 38 | $ 47 |  |  |
Year-to-date average recorded investment |  |  | 38 | 48 |
Interest income recognized |  |  | 1 | $ 8 |
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 |  |  | $ 49 |  |

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