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FAIR VALUE MEASUREMENTS - Quantitative Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost 4.00%  
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of estimated selling cost 10.00%  
Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 1,103,699 $ 926,803
Impaired Loans, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 232 68
Foreclosed Assets [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 76 76
Contingent Consideration [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 17,259 $ 0