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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | $ 20,764 |  | $ 20,764 |  | $ 26,160
Recorded investment with no allowance | 12,717 |  | 12,717 |  | 10,896
Recorded investment with an allowance | 7,065 |  | 7,065 |  | 11,076
Related allowance | 875 |  | 875 |  | 2,141
Average recorded investment | 19,129 | $ 25,052 | 20,239 | $ 26,148 |
Interest income recognized |  |  | 344 | 350 |
Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 7,271 |  | 7,271 |  | 13,160
Recorded investment with no allowance | 3,335 |  | 3,335 |  | 3,015
Recorded investment with an allowance | 2,954 |  | 2,954 |  | 5,957
Related allowance | 571 |  | 571 |  | 1,904
Average recorded investment | 6,563 | 11,757 | 7,661 | 11,945 |
Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 13,493 |  | 13,493 |  | 13,000
Recorded investment with no allowance | 9,382 |  | 9,382 |  | 7,881
Recorded investment with an allowance | 4,111 |  | 4,111 |  | 5,119
Related allowance | 304 |  | 304 |  | 237
Average recorded investment | 12,566 | 13,295 | 12,578 | 14,203 |
Interest income recognized |  |  | 344 | 350 |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 7,361 |  | 7,361 |  | 7,888
Recorded investment with no allowance | 4,629 |  | 4,629 |  | 4,786
Recorded investment with an allowance | 2,561 |  | 2,561 |  | 2,992
Related allowance | 251 |  | 251 |  | 317
Average recorded investment | 6,531 | 8,112 | 7,193 | 8,306 |
Interest income recognized |  |  | 117 | 149 |
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 2,736 |  | 2,736 |  | 4,013
Recorded investment with no allowance | 2,439 |  | 2,439 |  | 1,957
Recorded investment with an allowance | 126 |  | 126 |  | 1,946
Related allowance | 23 |  | 23 |  | 166
Average recorded investment | 2,840 | 4,012 | 3,573 | 3,406 |
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 4,625 |  | 4,625 |  | 3,875
Recorded investment with no allowance | 2,190 |  | 2,190 |  | 2,829
Recorded investment with an allowance | 2,435 |  | 2,435 |  | 1,046
Related allowance | 228 |  | 228 |  | 151
Average recorded investment | 3,691 | 4,100 | 3,620 | 4,900 |
Interest income recognized |  |  | 117 | 149 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 5,910 |  | 5,910 |  | 6,737
Recorded investment with no allowance | 4,524 |  | 4,524 |  | 2,532
Recorded investment with an allowance | 741 |  | 741 |  | 3,556
Related allowance | 35 |  | 35 |  | 185
Average recorded investment | 5,330 | 7,159 | 5,499 | 7,402 |
Interest income recognized |  |  | 145 | 127 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 1,075 |  | 1,075 |  | 1,801
Recorded investment with no allowance | 430 |  | 430 |  | 959
Recorded investment with an allowance |  |  |  |  | 193
Related allowance |  |  |  |  | 117
Average recorded investment | 489 | 2,177 | 627 | 2,265 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 4,835 |  | 4,835 |  | 4,936
Recorded investment with no allowance | 4,094 |  | 4,094 |  | 1,573
Recorded investment with an allowance | 741 |  | 741 |  | 3,363
Related allowance | 35 |  | 35 |  | 68
Average recorded investment | 4,841 | 4,982 | 4,872 | 5,137 |
Interest income recognized |  |  | 145 | 127 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 425 |  | 425 |  |
Recorded investment with no allowance | 341 |  | 341 |  |
Average recorded investment | 344 | 108 | 153 | 143 |
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 425 |  | 425 |  |
Recorded investment with no allowance | 341 |  | 341 |  |
Average recorded investment | 344 | 108 | 153 | 143 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance |  |  |  |  | 99
Recorded investment with no allowance |  |  |  |  | 99
Average recorded investment |  | 99 | 55 | 109 |
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance |  |  |  |  | 99
Recorded investment with no allowance |  |  |  |  | 99
Average recorded investment |  | 99 | 55 | 109 |
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Unpaid principal balance | 7,068 |  | 7,068 |  | 11,436
Recorded investment with no allowance | 3,223 |  | 3,223 |  | 3,479
Recorded investment with an allowance | 3,763 |  | 3,763 |  | 4,528
Related allowance | 589 |  | 589 |  | 1,639
Average recorded investment | 6,924 | 9,574 | 7,339 | 10,188 |
Interest income recognized |  |  | 82 | 74 |
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 | 3,035 |  | 3,035 |  | 7,247
Recorded investment with no allowance | 125 |  | 125 |  |
Recorded investment with an allowance | 2,828 |  | 2,828 |  | 3,818
Related allowance | 548 |  | 548 |  | 1,621
Average recorded investment | 2,890 | 5,361 | 3,253 | 6,022 |
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 | 4,033 |  | 4,033 |  | 4,189
Recorded investment with no allowance | 3,098 |  | 3,098 |  | 3,479
Recorded investment with an allowance | 935 |  | 935 |  | 710
Related allowance | 41 |  | 41 |  | $ 18
Average recorded investment | $ 4,034 | $ 4,213 | 4,086 | 4,166 |
Interest income recognized |  |  | $ 82 | $ 74 |

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