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Loans (Details 4) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | $ 318 |  | $ 162 |  |  |
Collectively evaluated for impairment | 12,938 |  | 12,048 |  |  |
Acquired loans collectively evaluated for impairment | 121 |  | 105 |  |  |
Total ending allowance balance | 13,377 | $ 12,764 | 12,315 | $ 12,104 | $ 11,746 | $ 10,852
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 6,554 |  | 5,536 |  |  |
Loans collectively evaluated for impairment | 1,417,801 |  | 1,259,993 |  |  |
Acquired loans | 266,279 |  | 310,118 |  |  |
Acquired with deteriorated credit quality | 975,866 |  | 895,561 |  |  |
Loans | 1,691,532 |  | 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 | 898 |  | 1,734 |  |  |
Commercial real estate |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 6 |  | 0 |  |  |
Collectively evaluated for impairment | 4,676 |  | 4,214 |  |  |
Acquired loans collectively evaluated for impairment | 58 |  | 46 |  |  |
Total ending allowance balance | 4,740 | 4,339 | 4,260 | 4,219 | 3,954 | 3,577
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 804 |  | 658 |  |  |
Loans collectively evaluated for impairment | 579,225 |  | 497,168 |  |  |
Acquired loans | 117,907 |  | 131,926 |  |  |
Loans | 698,172 |  | 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 | 236 |  | 948 |  |  |
Commercial |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 4 |  | 4 |  |  |
Collectively evaluated for impairment | 1,987 |  | 1,993 |  |  |
Acquired loans collectively evaluated for impairment | 16 |  | 14 |  |  |
Total ending allowance balance | 2,007 | 1,937 | 2,011 | 2,015 | 1,936 | 1,874
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 147 |  | 260 |  |  |
Loans collectively evaluated for impairment | 247,094 |  | 225,312 |  |  |
Acquired loans | 29,791 |  | 38,503 |  |  |
Loans | 277,694 |  | 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 | 662 |  | 786 |  |  |
Residential real estate |  |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |  |
Individually evaluated for impairment | 308 |  | 158 |  |  |
Collectively evaluated for impairment | 2,469 |  | 2,322 |  |  |
Acquired loans collectively evaluated for impairment | 43 |  | 41 |  |  |
Total ending allowance balance | 2,820 | 2,651 | 2,521 | 2,333 | 2,310 | 2,205
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 5,539 |  | 4,559 |  |  |
Loans collectively evaluated for impairment | 375,708 |  | 339,143 |  |  |
Acquired loans | 107,903 |  | 125,182 |  |  |
Loans | 489,150 |  | 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 | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 3,031 |  | 2,844 |  |  |
Acquired loans collectively evaluated for impairment | 4 |  | 4 |  |  |
Total ending allowance balance | 3,035 | 3,050 | 2,848 | 2,907 | 2,927 | 2,766
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment | 64 |  | 59 |  |  |
Loans collectively evaluated for impairment | 215,774 |  | 198,370 |  |  |
Acquired loans | 10,678 |  | 14,507 |  |  |
Loans | 226,516 |  | 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 | 775 |  | 675 |  |  |
Acquired loans collectively evaluated for impairment | 0 |  | 0 |  |  |
Total ending allowance balance | 775 | $ 787 | 675 | $ 630 | $ 619 | $ 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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