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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | $ 1,231,541 | $ 1,209,894
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 322,418 | 319,590
Real Estate Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 511,835 | 493,481
Real Estate Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 312,567 | 310,667
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 84,721 | 86,156
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 1,182,530 | 1,164,672
Pass [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 309,696 | 306,066
Pass [Member] | Real Estate Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 486,289 | 472,270
Pass [Member] | Real Estate Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 301,962 | 300,299
Pass [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 84,583 | 86,037
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 21,316 | 18,129
Special Mention [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 6,171 | 6,135
Special Mention [Member] | Real Estate Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 13,280 | 9,858
Special Mention [Member] | Real Estate Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 1,865 | 2,123
Special Mention [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net |  | 13
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 27,695 | 27,093
Substandard [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 6,551 | 7,389
Substandard [Member] | Real Estate Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 12,266 | 11,353
Substandard [Member] | Real Estate Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | 8,740 | 8,245
Substandard [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net | $ 138 | $ 106

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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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