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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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