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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 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 18,960 | $ 15,961 | $ 12,975 | $ 10,338
Ending balance: individually evaluated for impairment | 766 | 1,942 | 2,140 |
Ending balance: collectively evaluated for impairment | 18,194 | 14,019 | 10,728 |
Loans receivable: |  |  |  |
Ending balance | 1,693,065 | 1,532,965 | 1,340,865 |
Ending balance: individually evaluated for impairment | 9,705 | 11,242 | 10,267 |
Ending balance: collectively evaluated for impairment | 1,682,343 | 1,519,386 | 1,328,230 |
Ending balance | 1,017 | 2,337 | 2,368 |
Loans Acquired with Deteriorated Credit Quality |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance |  |  | 107 |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 5,052 | 3,799 | 3,042 | 2,321
Ending balance: individually evaluated for impairment | 159 | 225 | 759 |
Ending balance: collectively evaluated for impairment | 4,893 | 3,574 | 2,283 |
Loans receivable: |  |  |  |
Ending balance | 476,199 | 408,814 | 365,767 |
Ending balance: individually evaluated for impairment | 2,121 | 1,724 | 1,196 |
Ending balance: collectively evaluated for impairment | 473,736 | 406,127 | 363,620 |
Ending balance | 342 | 963 | 951 |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 7,548 | 5,847 | 4,245 | 3,037
Ending balance: individually evaluated for impairment | 263 | 1,197 | 126 |
Ending balance: collectively evaluated for impairment | 7,285 | 4,650 | 4,012 |
Loans receivable: |  |  |  |
Ending balance | 786,210 | 700,144 | 567,277 |
Ending balance: individually evaluated for impairment | 3,644 | 5,820 | 4,006 |
Ending balance: collectively evaluated for impairment | 781,921 | 692,987 | 561,903 |
Ending balance | 645 | 1,337 | 1,368 |
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance |  |  | 107 |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,380 | 1,608 | 1,583 | $ 1,290
Ending balance: individually evaluated for impairment | 8 |  | 117 |
Ending balance: collectively evaluated for impairment | 1,372 | 1,608 | 1,466 |
Loans receivable: |  |  |  |
Ending balance | 142,721 | 134,226 | 101,603 |
Ending balance: individually evaluated for impairment | 177 | 155 | 148 |
Ending balance: collectively evaluated for impairment | $ 142,544 | $ 134,071 | 101,455 |
Unallocated |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance |  |  | 23 |
Ending balance: collectively evaluated for impairment |  |  | $ 23 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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