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Deposits - Summary of major classifications of Interest-bearing deposits (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Deposits [Abstract] |  |  |
NOW and SuperNOW | $ 26,990,274us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW | $ 27,991,553us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW | $ 31,699,734us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW
Money Market | 20,465,436us-gaap_InterestBearingDomesticDepositMoneyMarket | 19,219,579us-gaap_InterestBearingDomesticDepositMoneyMarket | 20,734,875us-gaap_InterestBearingDomesticDepositMoneyMarket
Savings | 74,973,038us-gaap_InterestBearingDomesticDepositSavings | 71,278,801us-gaap_InterestBearingDomesticDepositSavings | 68,516,141us-gaap_InterestBearingDomesticDepositSavings
Certificates of Deposit, $100,000 or more | 36,118,031us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits | 28,916,597us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits | 28,213,893us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Other time deposits | 91,767,589us-gaap_InterestBearingDomesticDepositOtherTimeDeposit | 89,649,301us-gaap_InterestBearingDomesticDepositOtherTimeDeposit | 98,835,758us-gaap_InterestBearingDomesticDepositOtherTimeDeposit
Interest-bearing deposits | $ 250,314,368us-gaap_InterestBearingDepositLiabilities | $ 237,055,831us-gaap_InterestBearingDepositLiabilities | $ 248,000,401us-gaap_InterestBearingDepositLiabilities

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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic certificate of deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic money market demand account deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic negotiable order of withdrawal (NOW) demand deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic deposit liabilities for time deposit liabilities other than certificates of deposit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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