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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 + Details
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