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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, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 16,969 | $ 15,961 | $ 14,158 | $ 12,975
Ending balance: individually evaluated for impairment | 1,424 | 1,942 |  |
Ending balance: collectively evaluated for impairment | 15,545 | 14,019 |  |
Loans receivable: |  |  |  |
Ending balance | 1,559,867 | 1,532,965 |  |
Ending balance: individually evaluated for impairment | 9,726 | 11,242 |  |
Ending balance: collectively evaluated for impairment | 1,548,393 | 1,519,386 |  |
Loans Acquired with Deteriorated Credit Quality |  |  |  |
Loans receivable: |  |  |  |
Ending balance | 1,748 | 2,337 |  |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 4,129 | 3,799 | 3,322 | 3,042
Ending balance: individually evaluated for impairment | 404 | 225 |  |
Ending balance: collectively evaluated for impairment | 3,725 | 3,574 |  |
Loans receivable: |  |  |  |
Ending balance | 431,164 | 408,814 |  |
Ending balance: individually evaluated for impairment | 2,311 | 1,724 |  |
Ending balance: collectively evaluated for impairment | 428,476 | 406,127 |  |
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Loans receivable: |  |  |  |
Ending balance | 377 | 963 |  |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 6,291 | 5,847 | 4,616 | 4,245
Ending balance: individually evaluated for impairment | 513 | 1,197 |  |
Ending balance: collectively evaluated for impairment | 5,778 | 4,650 |  |
Loans receivable: |  |  |  |
Ending balance | 703,194 | 700,144 |  |
Ending balance: individually evaluated for impairment | 3,849 | 5,820 |  |
Ending balance: collectively evaluated for impairment | 698,008 | 692,987 |  |
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |
Loans receivable: |  |  |  |
Ending balance | 1,337 | 1,337 |  |
Real estate Residential |  |  |  |
Loans receivable: |  |  |  |
Ending balance | 286,389 | 289,781 |  |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,571 | 1,608 | 1,646 | 1,583
Ending balance: individually evaluated for impairment | 23 |  |  |
Ending balance: collectively evaluated for impairment | 1,548 | 1,608 |  |
Loans receivable: |  |  |  |
Ending balance | 139,120 | 134,226 |  |
Ending balance: individually evaluated for impairment | 207 | 155 |  |
Ending balance: collectively evaluated for impairment | $ 138,913 | $ 134,071 |  |
Unallocated |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance |  |  | $ 215 | $ 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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