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SEGMENT REPORTING (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Segment Reporting [Abstract]                              
Number of reportable segments | segment                         3    
Segment data [Abstract]                              
Net interest income (expense) $ 70,667 $ 68,475 $ 73,850 $ 65,999 $ 64,513 $ 62,137 $ 67,737 $ 64,651 $ 65,617 $ 66,968 $ 71,350 $ 60,272 $ 278,991 $ 259,038 $ 264,207
Provision for credit losses 8,775 4,612 30,290 6,089 8,980 15,093 37,296 3,407 4,121 9,112 33,318 9,099 49,766 64,776 55,650
Noninterest income 49,542 $ 62,453 $ 113,453 $ 45,455 40,750 $ 41,048 $ 120,513 $ 37,483 35,980 $ 43,790 $ 105,025 $ 37,751 270,904 239,794 222,545
Noninterest expense                         343,683 319,051 333,160
Income (loss) before income tax expense (benefit)                         156,446 115,005 97,942
Total assets 6,690,650       6,092,074       6,182,890       6,690,650 6,092,074 6,182,890
Goodwill 309,505       309,505       309,505       309,505 309,505 309,505
Total deposits 5,514,971       4,979,200       4,337,005       5,514,971 4,979,200 4,337,005
Consumer                              
Segment data [Abstract]                              
Net interest income (expense)                         92,133 93,245 69,131
Provision for credit losses                         35,765 21,807 25,138
Noninterest income                         195,708 158,284 162,212
Noninterest expense                         90,800 76,521 76,931
Income (loss) before income tax expense (benefit)                         161,276 153,201 129,274
Total assets 372,115       294,937       436,985       372,115 294,937 436,985
Goodwill 87,145       87,145       87,145       87,145 87,145 87,145
Total deposits 5,342,192       4,555,999       2,444,452       5,342,192 4,555,999 2,444,452
Commercial                              
Segment data [Abstract]                              
Net interest income (expense)                         173,325 150,766 152,565
Provision for credit losses                         19,791 29,296 21,901
Noninterest income                         61,813 60,151 54,224
Noninterest expense                         114,917 107,802 127,033
Income (loss) before income tax expense (benefit)                         100,430 73,819 57,855
Total assets 3,191,215       2,836,149       2,432,381       3,191,215 2,836,149 2,432,381
Goodwill 222,360       222,360       222,360       222,360 222,360 222,360
Total deposits 6,625       6,226       5,588       6,625 6,226 5,588
Corporate Services/Other                              
Segment data [Abstract]                              
Net interest income (expense)                         13,533 15,027 42,511
Provision for credit losses                         (5,790) 13,673 8,611
Noninterest income                         13,383 21,359 6,109
Noninterest expense                         137,966 134,728 129,196
Income (loss) before income tax expense (benefit)                         (105,260) (112,015) (89,187)
Total assets 3,127,320       2,960,988       3,313,524       3,127,320 2,960,988 3,313,524
Goodwill 0       0       0       0 0 0
Total deposits $ 166,154       $ 416,975       $ 1,886,965       $ 166,154 $ 416,975 $ 1,886,965