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Loans (Details 4) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | $ 436 | $ 61 |  |
Collectively evaluated for impairment | 21,526 | 14,320 |  |
Acquired loans collectively evaluated for impairment | 182 | 106 |  |
Total ending allowance balance | 22,144 | 14,487 | $ 13,592 | $ 12,315
Loans: |  |  |  |
Loans individually evaluated for impairment | 6,613 | 4,253 |  |
Loans collectively evaluated for impairment | 1,800,444 | 1,614,267 |  |
Acquired loans | 270,070 | 192,329 |  |
Acquired with deteriorated credit quality | 1,345,862 | 1,097,240 |  |
Loans | 2,078,044 | 1,811,539 |  |
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 | 917 | 690 |  |
Commercial real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 10,400 | 5,790 |  |
Acquired loans collectively evaluated for impairment | 97 | 53 |  |
Total ending allowance balance | 10,497 | 5,843 | 5,036 | 4,260
Loans: |  |  |  |
Loans individually evaluated for impairment | 502 | 561 |  |
Loans collectively evaluated for impairment | 758,050 | 702,226 |  |
Acquired loans | 135,884 | 86,431 |  |
Loans | 894,950 | 789,413 |  |
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 | 514 | 195 |  |
Commercial |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 357 | 2 |  |
Collectively evaluated for impairment | 4,546 | 2,309 |  |
Acquired loans collectively evaluated for impairment | 17 | 12 |  |
Total ending allowance balance | 4,920 | 2,323 | 2,093 | 2,011
Loans: |  |  |  |
Loans individually evaluated for impairment | 3,086 | 205 |  |
Loans collectively evaluated for impairment | 424,379 | 290,017 |  |
Acquired loans | 23,044 | 17,110 |  |
Loans | 450,912 | 307,827 |  |
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 | 403 | 495 |  |
Residential real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 79 | 59 |  |
Collectively evaluated for impairment | 3,392 | 2,777 |  |
Acquired loans collectively evaluated for impairment | 65 | 39 |  |
Total ending allowance balance | 3,536 | 2,875 | 2,837 | 2,521
Loans: |  |  |  |
Loans individually evaluated for impairment | 2,836 | 3,240 |  |
Loans collectively evaluated for impairment | 414,568 | 413,446 |  |
Acquired loans | 105,936 | 82,615 |  |
Loans | 523,340 | 499,301 |  |
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 | 2,520 | 2,708 |  |
Acquired loans collectively evaluated for impairment | 3 | 2 |  |
Total ending allowance balance | 2,523 | 2,710 | 2,963 | 2,848
Loans: |  |  |  |
Loans individually evaluated for impairment | 189 | 247 |  |
Loans collectively evaluated for impairment | 203,447 | 208,578 |  |
Acquired loans | 5,206 | 6,173 |  |
Loans | 208,842 | 214,998 |  |
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 | 668 | 736 |  |
Acquired loans collectively evaluated for impairment | 0 | 0 |  |
Total ending allowance balance | 668 | 736 | $ 663 | $ 675
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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