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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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+ References

No definition available.

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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

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