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Loans, net and allowance for loan losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Ending balance | $ 20,413 | $ 19,573 | $ 18,960 | $ 18,831 | $ 17,802 | $ 15,961
Ending balance: individually evaluated for impairment | 931 |  | 766 |  |  |
Ending balance: collectively evaluated for impairment | 19,482 |  | 18,194 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 1,779,445 |  | 1,693,065 |  |  |
Ending balance: individually evaluated for impairment | 10,341 |  | 9,705 |  |  |
Ending balance: collectively evaluated for impairment | 1,768,233 |  | 1,682,343 |  |  |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 871 |  | 1,017 |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 5,902 | 5,749 | 5,052 | 4,770 | 4,426 | 3,799
Ending balance: individually evaluated for impairment | 93 |  | 159 |  |  |
Ending balance: collectively evaluated for impairment | 5,809 |  | 4,893 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 478,128 |  | 476,199 |  |  |
Ending balance: individually evaluated for impairment | 1,996 |  | 2,121 |  |  |
Ending balance: collectively evaluated for impairment | 475,833 |  | 473,736 |  |  |
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 299 |  | 342 |  |  |
Real estate Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 8,005 | 7,506 | 7,548 | 7,194 | 6,587 | 5,847
Ending balance: individually evaluated for impairment | 462 |  | 263 |  |  |
Ending balance: collectively evaluated for impairment | 7,543 |  | 7,285 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 881,071 |  | 786,210 |  |  |
Ending balance: individually evaluated for impairment | 4,538 |  | 3,644 |  |  |
Ending balance: collectively evaluated for impairment | 875,988 |  | 781,921 |  |  |
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 545 |  | 645 |  |  |
Real estate Residential |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 5,139 | 4,962 | 4,980 | 5,293 | 5,196 | 4,707
Ending balance: individually evaluated for impairment | 362 |  | 336 |  |  |
Ending balance: collectively evaluated for impairment | 4,777 |  | 4,644 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 297,819 |  | 287,935 |  |  |
Ending balance: individually evaluated for impairment | 3,651 |  | 3,763 |  |  |
Ending balance: collectively evaluated for impairment | 294,141 |  | 284,142 |  |  |
Real estate Residential | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 27 |  | 30 |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 1,367 | $ 1,356 | 1,380 | $ 1,574 | $ 1,593 | $ 1,608
Ending balance: individually evaluated for impairment | 14 |  | 8 |  |  |
Ending balance: collectively evaluated for impairment | 1,353 |  | 1,372 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 122,427 |  | 142,721 |  |  |
Ending balance: individually evaluated for impairment | 156 |  | 177 |  |  |
Ending balance: collectively evaluated for impairment | $ 122,271 |  | $ 142,544 |  |  |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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