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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | $ 17,901 |  | $ 19,266
Recorded investment with no allowance | 8,838 |  | 10,977
Recorded investment with an allowance | 7,897 |  | 7,320
Related allowance | 801 |  | 805
Average recorded investment | 17,598 | $ 21,399 |
Interest income recognized | 100 | 130 |
Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 8,175 |  | 5,940
Recorded investment with no allowance | 3,137 |  | 1,813
Recorded investment with an allowance | 3,872 |  | 3,158
Related allowance | 501 |  | 492
Average recorded investment | 5,679 | 8,547 |
Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 9,726 |  | 13,326
Recorded investment with no allowance | 5,701 |  | 9,164
Recorded investment with an allowance | 4,025 |  | 4,162
Related allowance | 300 |  | 313
Average recorded investment | 11,919 | 12,852 |
Interest income recognized | 100 | 130 |
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 6,292 |  | 6,156
Recorded investment with no allowance | 2,901 |  | 3,524
Recorded investment with an allowance | 3,068 |  | 2,494
Related allowance | 237 |  | 239
Average recorded investment | 5,917 | 7,772 |
Interest income recognized | 46 | 43 |
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 2,122 |  | 1,620
Recorded investment with no allowance | 1,096 |  | 1,482
Recorded investment with an allowance | 703 |  |
Related allowance | 14 |  |
Average recorded investment | 1,625 | 4,010 |
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,170 |  | 4,536
Recorded investment with no allowance | 1,805 |  | 2,042
Recorded investment with an allowance | 2,365 |  | 2,494
Related allowance | 223 |  | 239
Average recorded investment | 4,292 | 3,762 |
Interest income recognized | 46 | 43 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 7,072 |  | 5,613
Recorded investment with no allowance | 5,699 |  | 4,233
Recorded investment with an allowance | 727 |  | 734
Related allowance | 36 |  | 33
Average recorded investment | 5,370 | 5,629 |
Interest income recognized | 41 | 57 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 2,506 |  | 795
Recorded investment with no allowance | 1,860 |  | 149
Average recorded investment | 720 | 721 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,566 |  | 4,818
Recorded investment with no allowance | 3,839 |  | 4,084
Recorded investment with an allowance | 727 |  | 734
Related allowance | 36 |  | 33
Average recorded investment | 4,650 | 4,908 |
Interest income recognized | 41 | 57 |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 455 |  | 425
Recorded investment with an allowance | 363 |  | 337
Related allowance | 59 |  | 33
Average recorded investment | 345 |  |
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 455 |  | 425
Recorded investment with an allowance | 363 |  | 337
Related allowance | 59 |  | 33
Average recorded investment | 345 |  |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Average recorded investment |  | 99 |
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Average recorded investment |  | 99 |
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,082 |  | 7,072
Recorded investment with no allowance | 238 |  | 3,220
Recorded investment with an allowance | 3,739 |  | 3,755
Related allowance | 469 |  | 500
Average recorded investment | 5,966 | 7,899 |
Interest income recognized | 13 | 30 |
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 | 3,092 |  | 3,100
Recorded investment with no allowance | 181 |  | 182
Recorded investment with an allowance | 2,806 |  | 2,821
Related allowance | 428 |  | 459
Average recorded investment | 2,989 | 3,717 |
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 | 990 |  | 3,972
Recorded investment with no allowance | 57 |  | 3,038
Recorded investment with an allowance | 933 |  | 934
Related allowance | 41 |  | $ 41
Average recorded investment | 2,977 | 4,182 |
Interest income recognized | $ 13 | $ 30 |

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