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FAIR VALUE MEASUREMENTS, Quantitative Information (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 4.00% 4.00%
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 10.00% 10.00%
Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 656,960 $ 504,388
Impaired Loans, Net [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 4,391 $ 1,152
Impaired Loans, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation techniques [1] Appraised values Appraised values
Foreclosed Assets, Net [Member] | Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 54 $ 15
Foreclosed Assets, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Valuation techniques [1] Appraised values Appraised values
[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%.