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SECURITIES - Schedule of Securities Available (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Securities AFS    
Amortized Cost $ 2,143,333 $ 2,165,719
Fair Value 1,804,228 1,882,869
Amortized Cost    
Due in one year or less 5,023 718
Due after one year through five years 11,175 9,921
Due after five years through ten years 79,139 89,921
Due after ten years 552,360 483,707
Total Amortized Cost 647,697 584,267
Mortgage-backed securities 1,495,636 1,581,452
Total securities AFS, at fair value 2,143,333 2,165,719
Fair Value    
Due in one year or less 4,971 715
Due after one year through five years 10,292 9,395
Due after five years through ten years 66,428 81,819
Due after ten years 497,012 441,943
Total Fair Value 578,703 533,872
Mortgage-backed securities 1,225,525 1,348,997
Total securities AFS, at fair value 1,804,228 1,882,869
Securities HTM    
Amortized Cost 36,591 41,682
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (5,166) (3,511)
Fair Value 31,425 38,171
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 6,252
OVER 12 MONTHS, Fair Value 31,425 31,919
TOTAL, Fair Value 31,425 38,171
LESS THAN 12 MONTHS, Unrealized (Losses) 0 (621)
OVER 12 MONTHS, Unrealized (Losses) (5,166) (2,890)
TOTAL, Unrealized (Losses) (5,166) (3,511)
AMORTIZED COST [Abstract]    
Due after ten years 34,415 39,093
Total Amortized Cost 34,415 39,093
Mortgage-backed securities 2,176 2,589
Total securities HTM, at cost 36,591 41,682
FAIR VALUE [Abstract]    
Due after ten years 29,571 35,903
Total Fair Value 29,571 35,903
Mortgage-backed securities 1,854 2,268
Total securities HTM, at cost 31,425 38,171
Corporate securities    
Securities AFS    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,750) (2,813)
Fair Value 18,250 22,187
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 0 0
Unrealized (Losses), Less than 12 months 0 0
Fair Value, 12 Months or Longer 18,250 22,187
Unrealized (Losses), 12 Months or Longer (6,750) (2,813)
Fair Value, Total 18,250 22,187
Unrealized (Losses), Total (6,750) (2,813)
Amortized Cost    
Total securities AFS, at fair value 25,000 25,000
Fair Value    
Total securities AFS, at fair value 18,250 22,187
SBA securities    
Securities AFS    
Amortized Cost 95,549 105,238
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (10,307) (7,470)
Fair Value 85,242 97,768
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 22,327 97,767
Unrealized (Losses), Less than 12 months (1,919) (7,470)
Fair Value, 12 Months or Longer 62,915 0
Unrealized (Losses), 12 Months or Longer (8,388) 0
Fair Value, Total 85,242 97,767
Unrealized (Losses), Total (10,307) (7,470)
Amortized Cost    
Total securities AFS, at fair value 95,549 105,238
Fair Value    
Total securities AFS, at fair value 85,242 97,768
Obligations of states and political subdivisions    
Securities AFS    
Amortized Cost 2,368 2,469
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (79) (125)
Fair Value 2,289 2,344
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 0 2,345
Unrealized (Losses), Less than 12 months 0 (125)
Fair Value, 12 Months or Longer 2,289 0
Unrealized (Losses), 12 Months or Longer (79) 0
Fair Value, Total 2,289 2,345
Unrealized (Losses), Total (79) (125)
Amortized Cost    
Total securities AFS, at fair value 2,368 2,469
Fair Value    
Total securities AFS, at fair value 2,289 2,344
Non-bank qualified obligations of states and political subdivisions    
Securities AFS    
Amortized Cost 269,396 290,754
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (42,673) (26,971)
Fair Value 226,723 263,783
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 5,010 195,816
Unrealized (Losses), Less than 12 months (83) (19,743)
Fair Value, 12 Months or Longer 221,714 67,967
Unrealized (Losses), 12 Months or Longer (42,590) (7,228)
Fair Value, Total 226,723 263,783
Unrealized (Losses), Total (42,673) (26,971)
Amortized Cost    
Total securities AFS, at fair value 269,396 290,754
Fair Value    
Total securities AFS, at fair value 226,723 263,783
Securities HTM    
Amortized Cost 34,415 39,093
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (4,844) (3,190)
Fair Value 29,571 35,903
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 3,984
OVER 12 MONTHS, Fair Value 29,571 31,919
TOTAL, Fair Value 29,571 35,903
LESS THAN 12 MONTHS, Unrealized (Losses) 0 (300)
OVER 12 MONTHS, Unrealized (Losses) (4,844) (2,890)
TOTAL, Unrealized (Losses) (4,844) (3,190)
AMORTIZED COST [Abstract]    
Total securities HTM, at cost 34,415 39,093
FAIR VALUE [Abstract]    
Total securities HTM, at cost 29,571 35,903
Asset-backed securities    
Securities AFS    
Amortized Cost 255,384 160,806
Gross Unrealized Gains 234 0
Gross Unrealized (Losses) (9,419) (13,016)
Fair Value 246,199 147,790
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 46,528 64,886
Unrealized (Losses), Less than 12 months (224) (1,838)
Fair Value, 12 Months or Longer 115,608 82,904
Unrealized (Losses), 12 Months or Longer (9,195) (11,178)
Fair Value, Total 162,136 147,790
Unrealized (Losses), Total (9,419) (13,016)
Amortized Cost    
Total securities AFS, at fair value 255,384 160,806
Fair Value    
Total securities AFS, at fair value 246,199 147,790
Mortgage-backed securities    
Securities AFS    
Amortized Cost 1,495,636 1,581,452
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (270,111) (232,455)
Fair Value 1,225,525 1,348,997
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 18,311 816,657
Unrealized (Losses), Less than 12 months (944) (106,583)
Fair Value, 12 Months or Longer 1,207,214 532,340
Unrealized (Losses), 12 Months or Longer (269,167) (125,872)
Fair Value, Total 1,225,525 1,348,997
Unrealized (Losses), Total (270,111) (232,455)
Amortized Cost    
Total securities AFS, at fair value 1,495,636 1,581,452
Fair Value    
Total securities AFS, at fair value 1,225,525 1,348,997
Securities HTM    
Amortized Cost 2,176 2,589
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (322) (321)
Fair Value 1,854 2,268
Held-to-maturity securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 2,268
OVER 12 MONTHS, Fair Value 1,854 0
TOTAL, Fair Value 1,854 2,268
LESS THAN 12 MONTHS, Unrealized (Losses) 0 (321)
OVER 12 MONTHS, Unrealized (Losses) (322) 0
TOTAL, Unrealized (Losses) (322) (321)
AMORTIZED COST [Abstract]    
Total securities HTM, at cost 2,176 2,589
FAIR VALUE [Abstract]    
Total securities HTM, at cost 1,854 2,268
Total debt securities AFS    
Securities AFS    
Amortized Cost 2,143,333 2,165,719
Gross Unrealized Gains 234 0
Gross Unrealized (Losses) (339,339) (282,850)
Fair Value 1,804,228 1,882,869
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
Fair Value, Less than 12 months 92,176 1,177,471
Unrealized (Losses), Less than 12 months (3,170) (135,759)
Fair Value, 12 Months or Longer 1,627,990 705,398
Unrealized (Losses), 12 Months or Longer (336,169) (147,091)
Fair Value, Total 1,720,165 1,882,869
Unrealized (Losses), Total (339,339) (282,850)
Amortized Cost    
Total securities AFS, at fair value 2,143,333 2,165,719
Fair Value    
Total securities AFS, at fair value $ 1,804,228 $ 1,882,869