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Loans (Details 4) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | $ 162 | $ 249 |  |
Collectively evaluated for impairment | 12,048 | 10,603 |  |
Acquired loans collectively evaluated for impairment | 105 | 0 |  |
Total ending allowance balance | 12,315 | 10,852 | $ 8,978 | $ 7,632
Loans: |  |  |  |
Loans individually evaluated for impairment | 5,536 | 7,338 |  |
Loans collectively evaluated for impairment | 1,259,993 | 1,048,074 |  |
Acquired loans | 310,118 | 370,359 |  |
Acquired with deteriorated credit quality | 895,561 | 779,340 |  |
Loans | 1,577,381 | 1,427,635 |  |
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 | 1,734 | 1,864 |  |
Commercial real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 86 |  |
Collectively evaluated for impairment | 4,214 | 3,491 |  |
Acquired loans collectively evaluated for impairment | 46 | 0 |  |
Total ending allowance balance | 4,260 | 3,577 | 3,127 | 2,676
Loans: |  |  |  |
Loans individually evaluated for impairment | 658 | 3,457 |  |
Loans collectively evaluated for impairment | 497,168 | 376,632 |  |
Acquired loans | 131,926 | 153,228 |  |
Loans | 630,700 | 534,285 |  |
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 | 948 | 968 |  |
Commercial |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 4 | 111 |  |
Collectively evaluated for impairment | 1,993 | 1,763 |  |
Acquired loans collectively evaluated for impairment | 14 | 0 |  |
Total ending allowance balance | 2,011 | 1,874 | 1,373 | 1,420
Loans: |  |  |  |
Loans individually evaluated for impairment | 260 | 477 |  |
Loans collectively evaluated for impairment | 225,312 | 195,146 |  |
Acquired loans | 38,503 | 48,536 |  |
Loans | 264,861 | 245,055 |  |
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 | 786 | 896 |  |
Residential real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 158 | 52 |  |
Collectively evaluated for impairment | 2,322 | 2,153 |  |
Acquired loans collectively evaluated for impairment | 41 | 0 |  |
Total ending allowance balance | 2,521 | 2,205 | 1,845 | 1,689
Loans: |  |  |  |
Loans individually evaluated for impairment | 4,559 | 3,308 |  |
Loans collectively evaluated for impairment | 339,143 | 280,215 |  |
Acquired loans | 125,182 | 146,672 |  |
Loans | 468,884 | 430,195 |  |
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 | 2,844 | 2,766 |  |
Acquired loans collectively evaluated for impairment | 4 | 0 |  |
Total ending allowance balance | 2,848 | 2,766 | 2,160 | 1,663
Loans: |  |  |  |
Loans individually evaluated for impairment | 59 | 96 |  |
Loans collectively evaluated for impairment | 198,370 | 196,081 |  |
Acquired loans | 14,507 | 21,923 |  |
Loans | 212,936 | 218,100 |  |
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 | 675 | 430 |  |
Acquired loans collectively evaluated for impairment | 0 | 0 |  |
Total ending allowance balance | 675 | 430 | $ 473 | $ 184
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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