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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, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Ending balance | $ 19,573 | $ 19,718 | $ 18,960 | $ 17,802 | $ 16,969 | $ 15,961
Ending balance: individually evaluated for impairment | 1,029 |  | 766 |  |  |
Ending balance: collectively evaluated for impairment | 18,544 |  | 18,194 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 1,753,389 |  | 1,693,065 |  |  |
Ending balance: individually evaluated for impairment | 9,637 |  | 9,705 |  |  |
Ending balance: collectively evaluated for impairment | 1,742,847 |  | 1,682,343 |  |  |
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 905 |  | 1,017 |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 5,749 | 5,406 | 5,052 | 4,426 | 4,129 | 3,799
Ending balance: individually evaluated for impairment | 146 |  | 159 |  |  |
Ending balance: collectively evaluated for impairment | 5,603 |  | 4,893 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 469,318 |  | 476,199 |  |  |
Ending balance: individually evaluated for impairment | 1,972 |  | 2,121 |  |  |
Ending balance: collectively evaluated for impairment | 467,035 |  | 473,736 |  |  |
Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 311 |  | 342 |  |  |
Real estate Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 7,506 | 8,099 | 7,548 | 6,587 | 6,291 | 5,847
Ending balance: individually evaluated for impairment | 502 |  | 263 |  |  |
Ending balance: collectively evaluated for impairment | 7,004 |  | 7,285 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 867,349 |  | 786,210 |  |  |
Ending balance: individually evaluated for impairment | 4,060 |  | 3,644 |  |  |
Ending balance: collectively evaluated for impairment | 862,723 |  | 781,921 |  |  |
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 566 |  | 645 |  |  |
Real estate Residential |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 4,962 | 4,839 | 4,980 | 5,196 | 4,978 | 4,707
Ending balance: individually evaluated for impairment | 378 |  | 336 |  |  |
Ending balance: collectively evaluated for impairment | 4,584 |  | 4,644 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 290,831 |  | 287,935 |  |  |
Ending balance: individually evaluated for impairment | 3,542 |  | 3,763 |  |  |
Ending balance: collectively evaluated for impairment | 287,261 |  | 284,142 |  |  |
Real estate Residential | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 28 |  | 30 |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 1,356 | $ 1,374 | 1,380 | $ 1,593 | $ 1,571 | $ 1,608
Ending balance: individually evaluated for impairment | 3 |  | 8 |  |  |
Ending balance: collectively evaluated for impairment | 1,353 |  | 1,372 |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance | 125,891 |  | 142,721 |  |  |
Ending balance: individually evaluated for impairment | 63 |  | 177 |  |  |
Ending balance: collectively evaluated for impairment | $ 125,828 |  | $ 142,544 |  |  |

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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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- 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=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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