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Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 Securities | Dec. 31, 2012 Securities
Schedule of Available-for-sale Securities [Line Items] |  |
Number of securities with unrealized loss | 64 | 16
Percentage of gross unrealized loss | 3.30% | 0.70%
Percentage of amortized investment securities portfolio | 1.40% | 0.10%
Number of securities in continuous loss position | 9 | 5
Loss duration | 12 months | 12 months
Gross gain on sale of investment securities | $ 428,000 | $ 230,000
Gross loss on sale of investment securities | 0 | 8,000
Accrued interest receivable for investment securities | 679,000 | 565,000
Securities pledged to secure public deposits | 43,977,000 | 41,462,000
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost on available for sale debt securities in continuous loss position | 7,478,000 | 2,653,000
Non-U.S. Agency Mortgage-Backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized loss on available for sale of debt securities | $ 378,000 | $ 39,000

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- Definition Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 7 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 + Details
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