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Long-term Borrowings - Summary of long-term borrowings (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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

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