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Loans Receivable - Classes of Loan Portfolio, Internal Risk Rating System (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total $ 265,520us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial $ 203,039us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 190,536us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 159,469us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 25,807us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 10,125us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Obligations of States and Political Subdivisions [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 49,177us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 33,445us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Pass [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 234,800us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 172,710us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 160,749us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 129,799us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 24,874us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 9,466us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Obligations of States and Political Subdivisions [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 49,177us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 33,445us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 8,365us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 9,876us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 8,020us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 9,440us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 345us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 436us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Obligations of States and Political Subdivisions [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total     
Substandard [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 22,057us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 20,453us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 21,469us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 20,230us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 588us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 223us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Obligations of States and Political Subdivisions [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total     
Doubtful [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 298us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		   
Doubtful [Member] | Commercial Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total 298us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		   
Doubtful [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total     
Doubtful [Member] | Obligations of States and Political Subdivisions [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loan, total