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Investment Securities - Gross Unrealized Loss and Fair Value of Available-for-Sale Securities, Aggregated by the Length of Time (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 27,884,201 | $ 28,513,200
Less Than 12 Months, Unrealized Loss | (871,743) | (287,841)
12 Months or More, Fair Value | 10,412,660 | 5,643,891
12 Months or More, Unrealized Loss | (584,604) | (356,109)
Total, Fair Value | 38,296,861 | 34,157,091
Total, Unrealized Loss | (1,456,347) | (643,950)
U. S. Government Agency Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 7,186,905 |
Less Than 12 Months, Unrealized Loss | (313,095) |
Total, Fair Value | 7,186,905 |
Total, Unrealized Loss | (313,095) |
U. S. Government Agency Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 20,697,296 | 25,670,832
Less Than 12 Months, Unrealized Loss | (558,648) | (130,209)
12 Months or More, Fair Value | 1,891,241 |
12 Months or More, Unrealized Loss | (106,023) |
Total, Fair Value | 22,588,537 | 25,670,832
Total, Unrealized Loss | (664,671) | (130,209)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value |  | 2,842,368
Less Than 12 Months, Unrealized Loss |  | (157,632)
12 Months or More, Fair Value | 8,521,419 | 5,643,891
12 Months or More, Unrealized Loss | (478,581) | (356,109)
Total, Fair Value | 8,521,419 | 8,486,259
Total, Unrealized Loss | $ (478,581) | $ (513,741)

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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position twelve months or longer aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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