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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 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Ending balance | $ 14,799 | $ 14,158 | $ 12,975 | $ 11,428 | $ 10,803 | $ 10,338
Ending balance: individually evaluated for impairment | 1,814 |  | 2,140 |  |  |
Ending balance: collectively evaluated for impairment | 12,985 |  | 10,728 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 1,464,808 |  | 1,340,865 |  |  |
Ending balance: individually evaluated for impairment | 9,348 |  | 10,267 |  |  |
Ending balance: collectively evaluated for impairment | 1,453,033 |  | 1,328,230 |  |  |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance |  |  | 107 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 2,427 |  | 2,368 |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 3,263 | 3,322 | 3,042 | 2,435 | 2,420 | 2,321
Ending balance: individually evaluated for impairment | 615 |  | 759 |  |  |
Ending balance: collectively evaluated for impairment | 2,648 |  | 2,283 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 394,283 |  | 365,767 |  |  |
Ending balance: individually evaluated for impairment | 870 |  | 1,196 |  |  |
Ending balance: collectively evaluated for impairment | 392,372 |  | 363,620 |  |  |
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 1,041 |  | 951 |  |  |
Real estate Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 5,077 | 4,616 | 4,245 | 3,190 | 3,087 | 3,037
Ending balance: individually evaluated for impairment | 405 |  | 126 |  |  |
Ending balance: collectively evaluated for impairment | 4,672 |  | 4,012 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 647,058 |  | 567,277 |  |  |
Ending balance: individually evaluated for impairment | 5,073 |  | 4,006 |  |  |
Ending balance: collectively evaluated for impairment | 640,642 |  | 561,903 |  |  |
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance |  |  | 107 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 1,343 |  | 1,368 |  |  |
Real estate Residential |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 299,037 |  | 306,218 |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 1,679 | 1,646 | 1,583 | $ 1,776 | $ 1,387 | $ 1,290
Ending balance: individually evaluated for impairment | 71 |  | 117 |  |  |
Ending balance: collectively evaluated for impairment | 1,608 |  | 1,466 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 124,430 |  | 101,603 |  |  |
Ending balance: individually evaluated for impairment | 228 |  | 148 |  |  |
Ending balance: collectively evaluated for impairment | 124,202 |  | 101,455 |  |  |
Unallocated |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 315 | $ 215 | 23 |  |  |
Ending balance: collectively evaluated for impairment | $ 315 |  | $ 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=49124121&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=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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=49124121&loc=SL6953423-111524 + Details
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