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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 2,190,638 $ 2,165,719
Fair Value 1,914,271 1,882,869
Amortized Cost    
Due in one year or less 4,784 718
Due after one year through five years 4,814 9,921
Due after five years through ten years 86,500 89,921
Due after ten years 568,240 483,707
Total 664,338 584,267
Mortgage-backed securities 1,526,300 1,581,452
Fair Value    
Due in one year or less 4,728 715
Due after one year through five years 4,400 9,395
Due after five years through ten years 75,126 81,819
Due after ten years 520,353 441,943
Total 604,607 533,872
Mortgage-backed securities 1,309,664 1,348,997
Corporate securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,250) (2,813)
Fair Value 18,750 22,187
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 18,750 22,187
OVER 12 MONTHS, Gross Unrealized (Losses) (6,250) (2,813)
TOTAL, Fair Value 18,750 22,187
TOTAL, Gross Unrealized (Losses) (6,250) (2,813)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 98,342 105,238
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (7,737) (7,470)
Fair Value 90,605 97,768
LESS THAN 12 MONTHS, Fair Value 39,964 97,767
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (2,048) (7,470)
OVER 12 MONTHS, Fair Value 50,641 0
OVER 12 MONTHS, Gross Unrealized (Losses) (5,689) 0
TOTAL, Fair Value 90,605 97,767
TOTAL, Gross Unrealized (Losses) (7,737) (7,470)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,384 2,469
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (73) (125)
Fair Value 2,311 2,344
LESS THAN 12 MONTHS, Fair Value 0 2,345
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 (125)
OVER 12 MONTHS, Fair Value 2,311 0
OVER 12 MONTHS, Gross Unrealized (Losses) (73) 0
TOTAL, Fair Value 2,311 2,345
TOTAL, Gross Unrealized (Losses) (73) (125)
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 272,818 290,754
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (34,443) (26,971)
Fair Value 238,375 263,783
LESS THAN 12 MONTHS, Fair Value 38,703 195,816
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (2,128) (19,743)
OVER 12 MONTHS, Fair Value 198,715 67,967
OVER 12 MONTHS, Gross Unrealized (Losses) (32,315) (7,228)
TOTAL, Fair Value 237,418 263,783
TOTAL, Gross Unrealized (Losses) (34,443) (26,971)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 265,794 160,806
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (11,228) (13,016)
Fair Value 254,566 147,790
LESS THAN 12 MONTHS, Fair Value 98,655 64,886
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1,170) (1,838)
OVER 12 MONTHS, Fair Value 155,911 82,904
OVER 12 MONTHS, Gross Unrealized (Losses) (10,058) (11,178)
TOTAL, Fair Value 254,566 147,790
TOTAL, Gross Unrealized (Losses) (11,228) (13,016)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,526,300 1,581,452
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (216,636) (232,455)
Fair Value 1,309,664 1,348,997
LESS THAN 12 MONTHS, Fair Value 284,959 816,657
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (16,159) (106,583)
OVER 12 MONTHS, Fair Value 1,021,679 532,340
OVER 12 MONTHS, Gross Unrealized (Losses) (200,477) (125,872)
TOTAL, Fair Value 1,306,638 1,348,997
TOTAL, Gross Unrealized (Losses) (216,636) (232,455)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,190,638 2,165,719
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (276,367) (282,850)
Fair Value 1,914,271 1,882,869
LESS THAN 12 MONTHS, Fair Value 462,281 1,177,471
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (21,505) (135,759)
OVER 12 MONTHS, Fair Value 1,448,007 705,398
OVER 12 MONTHS, Gross Unrealized (Losses) (254,862) (147,091)
TOTAL, Fair Value 1,910,288 1,882,869
TOTAL, Gross Unrealized (Losses) $ (276,367) $ (282,850)