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Loans (Details 4) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | $ 210 | $ 162 |  |
Collectively evaluated for impairment | 12,223 | 12,048 |  |
Acquired loans collectively evaluated for impairment | 117 | 105 |  |
Total ending allowance balance | 12,550 | 12,315 | $ 11,319 | $ 10,852
Loans: |  |  |  |
Loans individually evaluated for impairment | 5,410 | 5,536 |  |
Loans collectively evaluated for impairment | 1,298,643 | 1,259,993 |  |
Acquired loans | 293,564 | 310,118 |  |
Acquired with deteriorated credit quality | 912,197 | 895,561 |  |
Loans | 1,599,339 | 1,577,381 |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | 1,722 | 1,734 |  |
Commercial real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 4,352 | 4,214 |  |
Acquired loans collectively evaluated for impairment | 52 | 46 |  |
Total ending allowance balance | 4,404 | 4,260 | 3,638 | 3,577
Loans: |  |  |  |
Loans individually evaluated for impairment | 537 | 658 |  |
Loans collectively evaluated for impairment | 511,423 | 497,168 |  |
Acquired loans | 126,721 | 131,926 |  |
Loans | 639,668 | 630,700 |  |
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | 987 | 948 |  |
Commercial |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 3 | 4 |  |
Collectively evaluated for impairment | 2,043 | 1,993 |  |
Acquired loans collectively evaluated for impairment | 16 | 14 |  |
Total ending allowance balance | 2,062 | 2,011 | 1,846 | 1,874
Loans: |  |  |  |
Loans individually evaluated for impairment | 255 | 260 |  |
Loans collectively evaluated for impairment | 237,114 | 225,312 |  |
Acquired loans | 34,425 | 38,503 |  |
Loans | 272,529 | 264,861 |  |
Commercial | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | 735 | 786 |  |
Residential real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 206 | 158 |  |
Collectively evaluated for impairment | 2,350 | 2,322 |  |
Acquired loans collectively evaluated for impairment | 45 | 41 |  |
Total ending allowance balance | 2,601 | 2,521 | 2,321 | 2,205
Loans: |  |  |  |
Loans individually evaluated for impairment | 4,553 | 4,559 |  |
Loans collectively evaluated for impairment | 347,718 | 339,143 |  |
Acquired loans | 119,475 | 125,182 |  |
Loans | 471,746 | 468,884 |  |
Residential real estate | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Consumer |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 1 | 0 |  |
Collectively evaluated for impairment | 2,919 | 2,844 |  |
Acquired loans collectively evaluated for impairment | 4 | 4 |  |
Total ending allowance balance | 2,924 | 2,848 | 2,813 | 2,766
Loans: |  |  |  |
Loans individually evaluated for impairment | 65 | 59 |  |
Loans collectively evaluated for impairment | 202,388 | 198,370 |  |
Acquired loans | 12,943 | 14,507 |  |
Loans | 215,396 | 212,936 |  |
Consumer | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Unallocated |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 559 | 675 |  |
Acquired loans collectively evaluated for impairment | 0 | 0 |  |
Total ending allowance balance | 559 | 675 | $ 701 | $ 430
Loans: |  |  |  |
Loans individually evaluated for impairment | 0 | 0 |  |
Loans collectively evaluated for impairment | 0 | 0 |  |
Acquired loans | 0 | 0 |  |
Loans | 0 | 0 |  |
Unallocated | Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans: |  |  |  |
Acquired with deteriorated credit quality | $ 0 | $ 0 |  |

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