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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 1,179,942	$ 1,176,617
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	323,312	350,680
Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	456,153	413,058
Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	315,082	322,062
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	85,395	90,817
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	1,133,459	1,124,344
Pass [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	311,685	332,257
Pass [Member] | Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	430,443	386,825
Pass [Member] | Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	306,007	314,544
Pass [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	85,324	90,718
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	15,720	18,596
Special Mention [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	4,207	7,025
Special Mention [Member] | Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	10,100	10,701
Special Mention [Member] | Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	1,399	861
Special Mention [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	14	9
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	30,763	33,677
Substandard [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	7,420	11,398
Substandard [Member] | Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	15,610	15,532
Substandard [Member] | Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	7,676	6,657
Substandard [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	57	90
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net
Doubtful [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net
Doubtful [Member] | Real Estate Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net
Doubtful [Member] | Real Estate Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net
Doubtful [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net

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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 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&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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