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FAIR VALUE OF FINANCIAL INSTRUMENTS - Quantitative Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Foreclosed assets, net $ 7,249   $ 29,494
Minimum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Range of estimated selling cost 4.00%    
Maximum      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Range of estimated selling cost 30.00%    
Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value $ 0   0
Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 3,606,603   3,622,597
Impaired Loans | Level 3 | Valuation, Market Approach      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value   $ 13,574 8,707
Foreclosed Assets | Level 3 | Valuation, Market Approach      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value   $ 7,249 29,494
Nonrecurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 20,823   38,201
Nonrecurring | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 20,823   38,201
Nonrecurring | Commercial Portfolio Segment      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 13,489   8,707
Nonrecurring | Commercial Portfolio Segment | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Commercial Portfolio Segment | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Commercial Portfolio Segment | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 13,489   8,707
Nonrecurring | Impaired Loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 13,574   8,707
Nonrecurring | Impaired Loans | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Impaired Loans | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Impaired Loans | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 13,574   8,707
Nonrecurring | Foreclosed Assets      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Foreclosed assets, net 7,249   29,494
Nonrecurring | Foreclosed Assets | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Foreclosed assets, net 0   0
Nonrecurring | Foreclosed Assets | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Foreclosed assets, net 0   0
Nonrecurring | Foreclosed Assets | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Foreclosed assets, net 7,249   29,494
Nonrecurring | Commercial Real Estate and Operating      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 85    
Nonrecurring | Commercial Real Estate and Operating | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0    
Nonrecurring | Commercial Real Estate and Operating | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0    
Nonrecurring | Commercial Real Estate and Operating | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 85    
Nonrecurring | Community Banking Loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 85    
Nonrecurring | Community Banking Loans | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0    
Nonrecurring | Community Banking Loans | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0    
Nonrecurring | Community Banking Loans | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 85    
Nonrecurring | Total National Lending      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 13,489   8,707
Nonrecurring | Total National Lending | Level 1      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Total National Lending | Level 2      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value 0   0
Nonrecurring | Total National Lending | Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Fair value $ 13,489   $ 8,707