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DIVESTITURES - Summarized Division Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 17, 2020
Aug. 04, 2020
Balance Sheet Disclosures [Abstract]                                    
Gain on sale                           $ 19,275 $ 0 $ 0    
Income Statement Disclosures [Abstract]                                    
Net interest income - Retained   $ 64,513 $ 62,137 $ 67,737 $ 64,651 $ 65,617 $ 66,968 $ 71,350 $ 60,272 $ 48,537 $ 28,411 $ 27,405 $ 26,196 259,038 264,207 130,549    
Provision for loan and lease losses   8,980 15,093 37,296 3,407 4,121 9,112 33,318 9,099 4,706 5,315 18,343 1,068 64,776 55,650 29,432    
Noninterest income (expense)   40,750 $ 41,048 $ 120,513 $ 37,483 $ 35,980 $ 43,790 $ 105,025 $ 37,751 $ 24,613 $ 33,225 $ 97,419 $ 29,268 239,794 222,545 184,525    
Noninterest expense                           319,051 333,160 228,232    
Income (loss) before income tax expense (benefit)                           115,005 $ 97,942 $ 57,410    
Community Bank                                    
Balance Sheet Disclosures [Abstract]                                    
Total assets                                 $ 76,400 $ 58,600
Community Bank | Discontinued Operations                                    
Balance Sheet Disclosures [Abstract]                                    
Cash and cash equivalents $ 2,504                                  
Loans 268,584                                  
Premises, furniture and equipment 4,945                                  
Other assets 1,250                                  
Total assets 277,283                                  
Deposits 290,493                                  
Other liabilities 1,720                                  
Total liabilities 292,213                                  
Net assets (14,930)                                  
Purchase price 4,345                                  
Gain on sale $ 19,275                                  
Community Bank | Discontinued Operations | Community Bank                                    
Income Statement Disclosures [Abstract]                                    
Net interest income - Sold   0                       2,512        
Net interest income - Retained   9,045                       34,393        
Net interest income, Sold and Retained, Amount   9,045                       36,905        
Provision for loan and lease losses - Sold   (2,470)                       (4,711)        
Provision for loan and lease losses   4,370                       18,891        
Provision for loan and lease losses, Sold and Retained, Amount   1,900                       14,180        
Noninterest income - Sold   0                       19,694        
Noninterest income (expense)   5                       (3,468)        
Noninterest expense, Sold and Retained, Amount   5                       16,226        
Noninterest expense - Sold   327                       5,282        
Noninterest expense   2,646                       7,759        
Noninterest expense, Sold and Retained, Amount   2,973                       13,041        
Income before income tax expense - Sold   2,143                       21,635        
Income (loss) before income tax expense (benefit)   2,034                       4,275        
Income before income tax expense, Sold and Retained, Amount   $ 4,177                       $ 25,910