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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 | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | $ 23,758 |  | $ 23,758 | $ 26,637
Recorded investment with no allowance | 15,600 |  | 15,600 | 14,816
Recorded investment with an allowance | 6,760 |  | 6,760 | 10,502
Related allowance | 661 |  | 661 | 761
Average recorded investment | 21,954 | $ 16,428 | 22,816 | 16,916
Interest income recognized |  |  | 155 | 100
Impaired Nonaccrual Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 15,990 |  | 15,990 | 17,974
Recorded investment with no allowance | 11,505 |  | 11,505 | 12,039
Recorded investment with an allowance | 3,087 |  | 3,087 | 4,616
Related allowance | 406 |  | 406 | 541
Average recorded investment | 14,172 | 6,757 | 14,972 | 6,121
Impaired Accruing Restructured Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 7,768 |  | 7,768 | 8,663
Recorded investment with no allowance | 4,095 |  | 4,095 | 2,777
Recorded investment with an allowance | 3,673 |  | 3,673 | 5,886
Related allowance | 255 |  | 255 | 220
Average recorded investment | 7,782 | 9,671 | 7,844 | 10,795
Interest income recognized |  |  | 155 | 100
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 7,247 |  | 7,247 | 8,735
Recorded investment with no allowance | 3,777 |  | 3,777 | 4,045
Recorded investment with an allowance | 2,984 |  | 2,984 | 4,508
Related allowance | 230 |  | 230 | 301
Average recorded investment | 6,949 | 6,429 | 7,297 | 6,069
Interest income recognized |  |  | 81 | 46
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 3,035 |  | 3,035 | 4,281
Recorded investment with no allowance | 2,549 |  | 2,549 | 2,605
Recorded investment with an allowance |  |  |  | 1,494
Related allowance |  |  |  | 118
Average recorded investment | 2,730 | 1,590 | 3,034 | 1,504
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 4,212 |  | 4,212 | 4,454
Recorded investment with no allowance | 1,228 |  | 1,228 | 1,440
Recorded investment with an allowance | 2,984 |  | 2,984 | 3,014
Related allowance | 230 |  | 230 | 183
Average recorded investment | 4,219 | 4,839 | 4,263 | 4,565
Interest income recognized |  |  | 81 | 46
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 14,460 |  | 14,460 | 14,187
Recorded investment with no allowance | 11,778 |  | 11,778 | 10,593
Recorded investment with an allowance | 2,016 |  | 2,016 | 2,939
Related allowance | 272 |  | 272 | 104
Average recorded investment | 13,129 | 6,394 | 12,999 | 5,882
Interest income recognized |  |  | 66 | 41
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 10,949 |  | 10,949 | 10,029
Recorded investment with no allowance | 8,956 |  | 8,956 | 9,307
Recorded investment with an allowance | 1,327 |  | 1,327 | 67
Related allowance | 247 |  | 247 | 67
Average recorded investment | 9,613 | 1,853 | 9,466 | 1,286
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 3,511 |  | 3,511 | 4,158
Recorded investment with no allowance | 2,822 |  | 2,822 | 1,286
Recorded investment with an allowance | 689 |  | 689 | 2,872
Related allowance | 25 |  | 25 | 37
Average recorded investment | 3,516 | 4,541 | 3,533 | 4,596
Interest income recognized |  |  | 66 | 41
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 425 |  | 425 | 445
Recorded investment with an allowance | 311 |  | 311 | 340
Related allowance | 7 |  | 7 | 36
Average recorded investment | 314 | 332 | 319 | 344
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 425 |  | 425 | 445
Recorded investment with an allowance | 311 |  | 311 | 340
Related allowance | 7 |  | 7 | 36
Average recorded investment | 314 | 332 | 319 | 344
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 1,626 |  | 1,626 | 3,270
Recorded investment with no allowance | 45 |  | 45 | 178
Recorded investment with an allowance | 1,449 |  | 1,449 | 2,715
Related allowance | 152 |  | 152 | 320
Average recorded investment | 1,562 | 3,273 | 2,201 | 4,621
Interest income recognized |  |  | 8 | 13
Construction Loans [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 1,581 |  | 1,581 | 3,219
Recorded investment with no allowance |  |  |  | 127
Recorded investment with an allowance | 1,449 |  | 1,449 | 2,715
Related allowance | 152 |  | 152 | 320
Average recorded investment | 1,515 | 2,982 | 2,153 | 2,987
Construction Loans [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Unpaid principal balance | 45 |  | 45 | 51
Recorded investment with no allowance | 45 |  | 45 | 51
Average recorded investment | $ 47 | $ 291 | 48 | 1,634
Interest income recognized |  |  | $ 8 | $ 13

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