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Long-term Borrowings - Summary of long-term borrowings (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Federal Home Loan Bank of Atlanta, convertible advances | $ 20,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm |  |
Federal Home Loan Bank of Atlanta |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Federal Home Loan Bank of Atlanta, convertible advances | $ 20,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember | $ 20,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember | $ 20,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis = us-gaap_FederalHomeLoanBankOfAtlantaMember

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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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