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FAIR VALUES OF FINANCIAL INSTRUMENTS, Quantitative Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 4.00%  
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost (in hundredths) 10.00%  
Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 707,774 $ 504,388
Impaired Loans [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 2,543 1,152
Valuation techniques [1] Appraised values  
Foreclosed Assets [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 0 $ 15
Valuation techniques [1] 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%.