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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 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 22,105 | $ 21,379 | $ 19,718 | $ 18,960
Ending balance: individually evaluated for impairment | 988 | 1,179 |  |
Ending balance: collectively evaluated for impairment | 21,117 | 20,200 |  |
Loans receivable: |  |  |  |
Ending balance | 1,849,602 | 1,823,266 |  |
Ending balance: individually evaluated for impairment | 13,680 | 9,641 |  |
Ending balance: collectively evaluated for impairment | 1,835,922 | 1,813,625 |  |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 5,955 | 5,516 | 5,406 | 5,052
Ending balance: individually evaluated for impairment | 138 | 50 |  |
Ending balance: collectively evaluated for impairment | 5,817 | 5,466 |  |
Loans receivable: |  |  |  |
Ending balance | 516,756 | 494,134 |  |
Ending balance: individually evaluated for impairment | 7,012 | 2,237 |  |
Ending balance: collectively evaluated for impairment | 509,744 | 491,897 |  |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 11,074 | 10,736 | 8,099 | 7,548
Ending balance: individually evaluated for impairment | 389 | 403 |  |
Ending balance: collectively evaluated for impairment | 10,685 | 10,333 |  |
Loans receivable: |  |  |  |
Ending balance | 917,035 | 907,803 |  |
Ending balance: individually evaluated for impairment | 3,535 | 3,121 |  |
Ending balance: collectively evaluated for impairment | 913,500 | 904,682 |  |
Real estate Residential |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 3,880 | 3,892 | 4,839 | 4,980
Ending balance: individually evaluated for impairment | 461 | 666 |  |
Ending balance: collectively evaluated for impairment | 3,419 | 3,226 |  |
Loans receivable: |  |  |  |
Ending balance | 299,330 | 299,876 |  |
Ending balance: individually evaluated for impairment | 2,895 | 4,071 |  |
Ending balance: collectively evaluated for impairment | 296,435 | 295,805 |  |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,196 | 1,235 | $ 1,374 | $ 1,380
Ending balance: individually evaluated for impairment |  | 60 |  |
Ending balance: collectively evaluated for impairment | 1,196 | 1,175 |  |
Loans receivable: |  |  |  |
Ending balance | 116,481 | 121,453 |  |
Ending balance: individually evaluated for impairment | 238 | 212 |  |
Ending balance: collectively evaluated for impairment | $ 116,243 | $ 121,241 |  |

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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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