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Borrowings - Borrowings (Parenthetical) (Detail)	Dec. 31, 2014
Maximum [Member]
Borrowings Under Repurchase Agreements [Line items]
Federal Home Loan Bank advances, variable and fixed rates	7.53%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member]
Borrowings Under Repurchase Agreements [Line items]
Federal Home Loan Bank advances, variable and fixed rates	0.32%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition

States the weighted average interest rate applicable to the advances from the Federal Home Loan Bank outstanding as of the Balance Sheet date.

+ 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 210.9-03.13(3)(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 3

-Section VII

-Subsection 1

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