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FAIR VALUE MEASUREMENTS, Quantitative Information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 4.00%cash_RangeOfEstimatedSellingCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
4.00%cash_RangeOfEstimatedSellingCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 10.00%cash_RangeOfEstimatedSellingCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
10.00%cash_RangeOfEstimatedSellingCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 630,251us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
504,388us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Impaired Loans, Net [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 6,524us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cash_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,152us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cash_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Impaired Loans, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation techniques Appraised values [1] Appraised values [1]
Foreclosed Assets, Net [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cash_ForeclosedAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
15us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cash_ForeclosedAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Foreclosed Assets, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation techniques Appraised values [1] Appraised values [1]
[1] The Company generally relies on external appraisers to develop this information. Management reduced the appraised value by estimated selling costs in a range of 4% to 10%.