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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Available-for-sale debt securities [Abstract]
Amortized Cost	$ 2,131,916	$ 1,855,084
Fair Value	1,956,523	1,864,899
Amortized Cost
Due in one year or less	950	810
Due after one year through five years	10,797	13,026
Due after five years through ten years	68,339	50,785
Due after ten years	463,838	773,985
Total	543,924	838,606
Mortgage-backed securities	1,587,992	1,016,478
Fair Value
Due in one year or less	955	822
Due after one year through five years	10,489	13,378
Due after five years through ten years	63,705	52,357
Due after ten years	436,572	781,313
Total	511,721	847,870
Mortgage-backed securities	1,444,802	1,017,029
Corporate securities
Available-for-sale debt securities [Abstract]
Amortized Cost	25,000	25,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(1,562)	0
Fair Value	23,438	25,000
LESS THAN 12 MONTHS, Fair Value	23,438
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(1,562)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0
TOTAL, Fair Value	23,438
TOTAL, Gross Unrealized (Losses)	(1,562)
SBA securities
Available-for-sale debt securities [Abstract]
Amortized Cost	84,506	151,958
Gross Unrealized Gains	247	5,251
Gross Unrealized (Losses)	(3,404)	0
Fair Value	81,349	157,209
LESS THAN 12 MONTHS, Fair Value	73,758
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(3,404)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0
TOTAL, Fair Value	73,758
TOTAL, Gross Unrealized (Losses)	(3,404)
Obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	2,726	2,497
Gross Unrealized Gains	0	10
Gross Unrealized (Losses)	(85)	0
Fair Value	2,641	2,507
LESS THAN 12 MONTHS, Fair Value	2,401
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(85)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0
TOTAL, Fair Value	2,401
TOTAL, Gross Unrealized (Losses)	(85)
Non-bank qualified obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	260,069	266,048
Gross Unrealized Gains	29	3,347
Gross Unrealized (Losses)	(15,137)	(1,100)
Fair Value	244,961	268,295
LESS THAN 12 MONTHS, Fair Value	237,769	101,046
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(14,823)	(1,100)
OVER 12 MONTHS, Fair Value	3,414	0
OVER 12 MONTHS, Gross Unrealized (Losses)	(314)	0
TOTAL, Fair Value	241,183	101,046
TOTAL, Gross Unrealized (Losses)	(15,137)	(1,100)
Asset-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	171,623	393,103
Gross Unrealized Gains	0	3,003
Gross Unrealized (Losses)	(12,291)	(1,247)
Fair Value	159,332	394,859
LESS THAN 12 MONTHS, Fair Value	96,852	127,110
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(6,435)	(283)
OVER 12 MONTHS, Fair Value	62,481	91,553
OVER 12 MONTHS, Gross Unrealized (Losses)	(5,856)	(964)
TOTAL, Fair Value	159,333	218,663
TOTAL, Gross Unrealized (Losses)	(12,291)	(1,247)
Mortgage-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	1,587,992	1,016,478
Gross Unrealized Gains	655	9,728
Gross Unrealized (Losses)	(143,845)	(9,177)
Fair Value	1,444,802	1,017,029
LESS THAN 12 MONTHS, Fair Value	1,033,772	759,035
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(111,839)	(7,418)
OVER 12 MONTHS, Fair Value	227,715	60,792
OVER 12 MONTHS, Gross Unrealized (Losses)	(32,006)	(1,759)
TOTAL, Fair Value	1,261,487	819,827
TOTAL, Gross Unrealized (Losses)	(143,845)	(9,177)
Total debt securities AFS
Available-for-sale debt securities [Abstract]
Amortized Cost	2,131,916	1,855,084
Gross Unrealized Gains	931	21,339
Gross Unrealized (Losses)	(176,324)	(11,524)
Fair Value	1,956,523	1,864,899
LESS THAN 12 MONTHS, Fair Value	1,467,990	987,191
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(138,148)	(8,801)
OVER 12 MONTHS, Fair Value	293,610	152,345
OVER 12 MONTHS, Gross Unrealized (Losses)	(38,176)	(2,723)
TOTAL, Fair Value	1,761,600	1,139,536
TOTAL, Gross Unrealized (Losses)	$ (176,324)	$ (11,524)

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