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SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Nov. 20, 2019
Mar. 26, 2019
Subsequent Event [Line Items]              
Gain on sale     $ 5,089 $ 181 $ 0    
Common Stock              
Subsequent Event [Line Items]              
Number of shares authorized to be repurchased             2,000,000
Common Stock | Subsequent Event              
Subsequent Event [Line Items]              
Number of shares authorized to be repurchased           7,500,000  
Loans Held for Investment              
Subsequent Event [Line Items]              
Proceeds from sale of loans held-for-sale $ 111,700            
Loans Held for Investment | Community Banking | Subsequent Event              
Subsequent Event [Line Items]              
Gain on sale $ 200            
Forecast | Agricultural operating loans | Community Banking | Subsequent Event              
Subsequent Event [Line Items]              
Expected net loss on disposition of other real estate owned   $ 4,300