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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 21,379 | $ 18,960 | $ 15,961 | $ 12,975
Ending balance: individually evaluated for impairment | 1,179 | 766 | 1,942 |
Ending balance: collectively evaluated for impairment | 20,200 | 18,194 | 14,019 |
Loans receivable: |  |  |  |
Ending balance | 1,823,266 | 1,693,065 | 1,532,965 |
Ending balance: individually evaluated for impairment | 9,641 | 10,722 | 13,579 |
Ending balance: collectively evaluated for impairment | 1,813,625 | 1,682,343 | 1,519,386 |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 5,516 | 5,513 | 4,452 | 4,113
Ending balance: individually evaluated for impairment | 50 | 159 | 225 |
Ending balance: collectively evaluated for impairment | 5,466 | 5,354 | 4,227 |
Loans receivable: |  |  |  |
Ending balance | 494,134 | 476,199 | 408,814 |
Ending balance: individually evaluated for impairment | 2,237 | 2,463 | 2,687 |
Ending balance: collectively evaluated for impairment | 491,897 | 473,736 | 406,127 |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 10,736 | 8,944 | 7,548 | 4,751
Ending balance: individually evaluated for impairment | 403 | 263 | 1,197 |
Ending balance: collectively evaluated for impairment | 10,333 | 8,681 | 6,351 |
Loans receivable: |  |  |  |
Ending balance | 907,803 | 786,210 | 700,144 |
Ending balance: individually evaluated for impairment | 3,121 | 4,289 | 7,157 |
Ending balance: collectively evaluated for impairment | 904,682 | 781,921 | 692,987 |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,235 | 1,392 | 1,000 | $ 937
Ending balance: individually evaluated for impairment | 60 | 8 |  |
Ending balance: collectively evaluated for impairment | 1,175 | 1,384 | 1,000 |
Loans receivable: |  |  |  |
Ending balance | 121,453 | 142,721 | 134,226 |
Ending balance: individually evaluated for impairment | 212 | 177 | 155 |
Ending balance: collectively evaluated for impairment | $ 121,241 | $ 142,544 | $ 134,071 |

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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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