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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Available For Sale
Amortized Cost	$ 1,855,084	$ 1,244,384
Fair Value	1,864,899	1,268,102
Amortized Cost
Due in one year or less	810	1,385
Due after one year through five years	13,026	20,805
Due after five years through ten years	50,785	32,441
Due after ten years	773,985	749,874
Total Amortized Cost	838,606	804,505
Mortgage-backed securities	1,016,478	439,879
Total securities AFS, at fair value	1,855,084	1,244,384
Fair Value
Due in one year or less	822	1,398
Due after one year through five years	13,378	21,769
Due after five years through ten years	52,357	34,025
Due after ten years	781,313	757,303
Total Fair Value	847,870	814,495
Mortgage-backed securities	1,017,029	453,607
Total securities AFS, at fair value	1,864,899	1,268,102
Held To Maturity
Amortized Cost	56,669	92,610
Gross Unrealized Gains	193	1,164
Gross Unrealized (Losses)	(471)	(29)
Fair Value	56,391	93,745
Held-to-maturity securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	26,096	7,397
OVER 12 MONTHS, Fair Value	0	3,637
TOTAL, Fair Value	26,096	11,034
LESS THAN 12 MONTHS, Unrealized (Losses)	(471)	(9)
OVER 12 MONTHS, Unrealized (Losses)	0	(20)
TOTAL, Unrealized (Losses)	(471)	(29)
AMORTIZED COST [Abstract]
Due after ten years	52,944	87,183
Total Amortized Cost	52,944	87,183
Mortgage-backed securities	3,725	5,427
Total securities HTM, at cost	56,669	92,610
FAIR VALUE [Abstract]
Due after ten years	52,576	88,194
Total Fair Value	52,576	88,194
Mortgage-backed securities	3,815	5,551
Total securities HTM, at cost	56,391	93,745
Corporate securities
Available For Sale
Amortized Cost	25,000
Gross Unrealized Gains	0
Gross Unrealized (Losses)	0
Fair Value	25,000
Amortized Cost
Total securities AFS, at fair value	25,000
Fair Value
Total securities AFS, at fair value	25,000
SBA securities
Available For Sale
Amortized Cost	151,958	159,722
Gross Unrealized Gains	5,251	5,391
Gross Unrealized (Losses)	0	(158)
Fair Value	157,209	164,955
Available-for-sale securities in a continuous unrealized loss position [Abstract]
Fair Value, Less than 12 months		32,257
Unrealized (Losses), Less than 12 months		(102)
Fair Value, 12 Months or Longer		9,875
Unrealized (Losses), 12 Months or Longer		(56)
Fair Value, Total		42,132
Unrealized (Losses), Total		(158)
Amortized Cost
Total securities AFS, at fair value	151,958	159,722
Fair Value
Total securities AFS, at fair value	157,209	164,955
Obligations of states and political subdivisions
Available For Sale
Amortized Cost	2,497	825
Gross Unrealized Gains	10	16
Gross Unrealized (Losses)	0	0
Fair Value	2,507	841
Amortized Cost
Total securities AFS, at fair value	2,497	825
Fair Value
Total securities AFS, at fair value	2,507	841
Non-bank qualified obligations of states and political subdivisions
Available For Sale
Amortized Cost	266,048	314,819
Gross Unrealized Gains	3,347	8,978
Gross Unrealized (Losses)	(1,100)	(23)
Fair Value	268,295	323,774
Available-for-sale securities in a continuous unrealized loss position [Abstract]
Fair Value, Less than 12 months	101,046	6,265
Unrealized (Losses), Less than 12 months	(1,100)	(6)
Fair Value, 12 Months or Longer	0	3,103
Unrealized (Losses), 12 Months or Longer	0	(17)
Fair Value, Total	101,046	9,368
Unrealized (Losses), Total	(1,100)	(23)
Amortized Cost
Total securities AFS, at fair value	266,048	314,819
Fair Value
Total securities AFS, at fair value	268,295	323,774
Held To Maturity
Amortized Cost	52,944	87,183
Gross Unrealized Gains	103	1,040
Gross Unrealized (Losses)	(471)	(29)
Fair Value	52,576	88,194
Held-to-maturity securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	26,096	7,397
OVER 12 MONTHS, Fair Value	0	3,637
TOTAL, Fair Value	26,096	11,034
LESS THAN 12 MONTHS, Unrealized (Losses)	(471)	(9)
OVER 12 MONTHS, Unrealized (Losses)	0	(20)
TOTAL, Unrealized (Losses)	(471)	(29)
AMORTIZED COST [Abstract]
Total securities HTM, at cost	52,944	87,183
FAIR VALUE [Abstract]
Total securities HTM, at cost	52,576	88,194
Asset-backed securities
Available For Sale
Amortized Cost	393,103	329,139
Gross Unrealized Gains	3,003	2,015
Gross Unrealized (Losses)	(1,247)	(6,229)
Fair Value	394,859	324,925
Available-for-sale securities in a continuous unrealized loss position [Abstract]
Fair Value, Less than 12 months	127,110	106,474
Unrealized (Losses), Less than 12 months	(283)	(1,089)
Fair Value, 12 Months or Longer	91,553	178,686
Unrealized (Losses), 12 Months or Longer	(964)	(5,140)
Fair Value, Total	218,663	285,160
Unrealized (Losses), Total	(1,247)	(6,229)
Amortized Cost
Total securities AFS, at fair value	393,103	329,139
Fair Value
Total securities AFS, at fair value	394,859	324,925
Mortgage-backed securities
Available For Sale
Amortized Cost	1,016,478	439,879
Gross Unrealized Gains	9,728	14,567
Gross Unrealized (Losses)	(9,177)	(839)
Fair Value	1,017,029	453,607
Available-for-sale securities in a continuous unrealized loss position [Abstract]
Fair Value, Less than 12 months	759,035	138,338
Unrealized (Losses), Less than 12 months	(7,418)	(839)
Fair Value, 12 Months or Longer	60,792	0
Unrealized (Losses), 12 Months or Longer	(1,759)	0
Fair Value, Total	819,827	138,338
Unrealized (Losses), Total	(9,177)	(839)
Amortized Cost
Total securities AFS, at fair value	1,016,478	439,879
Fair Value
Total securities AFS, at fair value	1,017,029	453,607
Held To Maturity
Amortized Cost	3,725	5,427
Gross Unrealized Gains	90	124
Gross Unrealized (Losses)	0	0
Fair Value	3,815	5,551
AMORTIZED COST [Abstract]
Total securities HTM, at cost	3,725	5,427
FAIR VALUE [Abstract]
Total securities HTM, at cost	3,815	5,551
Total debt securities AFS
Available For Sale
Amortized Cost	1,855,084	1,244,384
Gross Unrealized Gains	21,339	30,967
Gross Unrealized (Losses)	(11,524)	(7,249)
Fair Value	1,864,899	1,268,102
Available-for-sale securities in a continuous unrealized loss position [Abstract]
Fair Value, Less than 12 months	987,191	283,334
Unrealized (Losses), Less than 12 months	(8,801)	(2,036)
Fair Value, 12 Months or Longer	152,345	191,664
Unrealized (Losses), 12 Months or Longer	(2,723)	(5,213)
Fair Value, Total	1,139,536	474,998
Unrealized (Losses), Total	(11,524)	(7,249)
Amortized Cost
Total securities AFS, at fair value	1,855,084	1,244,384
Fair Value
Total securities AFS, at fair value	$ 1,864,899	$ 1,268,102

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563

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