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Deposits - Summary of interest expense on deposits (Detail 1) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deposits [Abstract] |  |  |
NOW and SuperNOW | $ 11,608us-gaap_InterestExpenseDomesticDepositLiabilitiesNoticeOfWithdrawal | $ 11,300us-gaap_InterestExpenseDomesticDepositLiabilitiesNoticeOfWithdrawal | $ 15,754us-gaap_InterestExpenseDomesticDepositLiabilitiesNoticeOfWithdrawal
Money Market | 9,965us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket | 10,618us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket | 25,914us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket
Savings | 37,537us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings | 55,591us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings | 106,424us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings
Certificates of Deposit, $100,000 or more | 523,472us-gaap_InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit | 373,880us-gaap_InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit | 459,130us-gaap_InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit
Other time deposits | 1,310,732us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit | 1,562,938us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit | 2,003,684us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit
Interest expense | $ 1,893,314us-gaap_InterestExpenseDomesticDepositLiabilities | $ 2,014,327us-gaap_InterestExpenseDomesticDepositLiabilities | $ 2,610,906us-gaap_InterestExpenseDomesticDepositLiabilities

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- Definition Aggregate amount of all interest expense on domestic deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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- Definition Amount of interest expense on domestic certificates of deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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- Definition Amount of interest expense on 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 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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- Definition Amount of interest expense on domestic notice of withdrawal demand deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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- Definition Amount of interest expense on domestic time deposit liabilities other than certificates of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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- Definition Amount of interest expense on domestic savings deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 + Details
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