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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 1,177,122	$ 1,176,617
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	358,729	350,680
Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	409,723	413,058
Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	320,803	322,062
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 87,867	$ 90,817

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X

- 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 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524



Reference 2: 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

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