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SEGMENT REPORTING (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
segment
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments | segment     3      
Segment data [Abstract]            
Net interest income $ 136,279 $ 128,634 $ 261,528 $ 247,561    
Provision for credit loss 35,266 29,744 53,927 37,502    
Noninterest income 138,524 128,945 195,902 181,706    
Noninterest expense 148,177 140,742 275,973 261,819    
Income before income tax expense 91,360 87,093 127,530 129,946    
Total assets 6,994,786 7,416,809 6,994,786 7,416,809 $ 7,532,017  
Total goodwill 297,928 309,505 297,928 309,505 309,505 $ 309,505
Total deposits 5,819,209 6,368,344 5,819,209 6,368,344    
Consumer            
Segment data [Abstract]            
Net interest income 75,633 67,280 156,694 136,202    
Provision for credit loss 31,739 29,144 42,463 30,466    
Noninterest income 114,027 109,687 147,629 142,474    
Noninterest expense 66,948 59,763 120,327 111,579    
Income before income tax expense 90,973 88,060 141,533 136,631    
Total assets 431,962 463,212 431,962 463,212    
Total goodwill 87,145 87,145 87,145 87,145 87,145 87,145
Total deposits 5,633,529 6,063,339 5,633,529 6,063,339    
Commercial            
Segment data [Abstract]            
Net interest income 41,987 44,493 85,280 89,699    
Provision for credit loss 3,508 555 11,339 7,018    
Noninterest income 18,118 17,749 39,357 33,748    
Noninterest expense 33,601 38,130 66,366 72,986    
Income before income tax expense 22,996 23,557 46,932 43,443    
Total assets 3,975,353 4,127,524 3,975,353 4,127,524    
Total goodwill 210,783 222,360 210,783 222,360 222,360 222,360
Total deposits 140 7,143 140 7,143    
Corporate Services/Other            
Segment data [Abstract]            
Net interest income 18,659 16,861 19,554 21,660    
Provision for credit loss 19 45 125 18    
Noninterest income 6,379 1,509 8,916 5,484    
Noninterest expense 47,628 42,849 89,280 77,254    
Income before income tax expense (22,609) (24,524) (60,935) (50,128)    
Total assets 2,587,471 2,826,073 2,587,471 2,826,073    
Total goodwill 0 0 0 0 $ 0 $ 0
Total deposits $ 185,540 $ 297,862 $ 185,540 $ 297,862