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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 (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Allowance for loan losses: |  |
Ending balance: individually evaluated for impairment | $ 3,480 | $ 2,682
Ending balance: collectively evaluated for impairment | 7,841 | 7,379
Loans receivable: |  |
Ending balance | 1,231,541 | 1,209,894
Ending balance: individually evaluated for impairment | 12,550 | 11,807
Ending balance: collectively evaluated for impairment | 1,216,538 | 1,195,303
Loans Acquired with Deteriorated Credit Quality [Member] |  |
Loans receivable: |  |
Ending balance | 2,453 | 2,784
Commercial [Member] |  |
Allowance for loan losses: |  |
Ending balance: individually evaluated for impairment | 1,209 | 1,072
Ending balance: collectively evaluated for impairment | 1,226 | 1,081
Loans receivable: |  |
Ending balance | 322,418 | 319,590
Ending balance: individually evaluated for impairment | 1,948 | 2,595
Ending balance: collectively evaluated for impairment | 319,448 | 315,642
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |  |
Loans receivable: |  |
Ending balance | 1,022 | 1,353
Real Estate Commercial [Member] |  |
Allowance for loan losses: |  |
Ending balance: individually evaluated for impairment | 1,338 | 805
Ending balance: collectively evaluated for impairment | 1,745 | 2,125
Loans receivable: |  |
Ending balance | 511,835 | 493,481
Ending balance: individually evaluated for impairment | 6,080 | 5,084
Ending balance: collectively evaluated for impairment | 504,379 | 487,024
Real Estate Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |  |
Loans receivable: |  |
Ending balance | 1,376 | 1,373
Real Estate Residential [Member] |  |
Allowance for loan losses: |  |
Ending balance: individually evaluated for impairment | 796 | 767
Ending balance: collectively evaluated for impairment | 3,231 | 2,921
Loans receivable: |  |
Ending balance | 312,567 | 310,667
Ending balance: individually evaluated for impairment | 4,385 | 4,001
Ending balance: collectively evaluated for impairment | 308,127 | 306,608
Real Estate Residential [Member] | Loans Acquired with Deteriorated Credit Quality [Member] |  |
Loans receivable: |  |
Ending balance | 55 | 58
Consumer [Member] |  |
Allowance for loan losses: |  |
Ending balance: individually evaluated for impairment | 137 | 38
Ending balance: collectively evaluated for impairment | 1,639 | 1,252
Loans receivable: |  |
Ending balance | 84,721 | 86,156
Ending balance: individually evaluated for impairment | 137 | 127
Ending balance: collectively evaluated for impairment | $ 84,584 | $ 86,029

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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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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=49124121&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=28367877&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=49124121&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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