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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Available-for-sale debt securities [Abstract]
Amortized Cost	$ 2,115,921	$ 2,165,719
Fair Value	1,847,778	1,882,869
Amortized Cost
Due in one year or less	1,788	718
Due after one year through five years	8,834	9,921
Due after five years through ten years	89,916	89,921
Due after ten years	460,447	483,707
Total	560,985	584,267
Mortgage-backed securities	1,554,936	1,581,452
Fair Value
Due in one year or less	1,783	715
Due after one year through five years	8,349	9,395
Due after five years through ten years	81,020	81,819
Due after ten years	421,604	441,943
Total	512,756	533,872
Mortgage-backed securities	1,335,022	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)	(3,688)	(2,813)
Fair Value	21,312	22,187
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	21,313	22,187
OVER 12 MONTHS, Gross Unrealized (Losses)	(3,688)	(2,813)
TOTAL, Fair Value	21,313	22,187
TOTAL, Gross Unrealized (Losses)	(3,688)	(2,813)
SBA securities
Available-for-sale debt securities [Abstract]
Amortized Cost	103,325	105,238
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(7,560)	(7,470)
Fair Value	95,765	97,768
LESS THAN 12 MONTHS, Fair Value	79,470	97,767
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(4,652)	(7,470)
OVER 12 MONTHS, Fair Value	16,294	0
OVER 12 MONTHS, Gross Unrealized (Losses)	(2,908)	0
TOTAL, Fair Value	95,764	97,767
TOTAL, Gross Unrealized (Losses)	(7,560)	(7,470)
Obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	2,453	2,469
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(102)	(125)
Fair Value	2,351	2,344
LESS THAN 12 MONTHS, Fair Value	255	2,345
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(17)	(125)
OVER 12 MONTHS, Fair Value	2,096	0
OVER 12 MONTHS, Gross Unrealized (Losses)	(85)	0
TOTAL, Fair Value	2,351	2,345
TOTAL, Gross Unrealized (Losses)	(102)	(125)
Non-bank qualified obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	283,301	290,754
Gross Unrealized Gains	10	0
Gross Unrealized (Losses)	(25,259)	(26,971)
Fair Value	258,052	263,783
LESS THAN 12 MONTHS, Fair Value	115,532	195,816
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(9,588)	(19,743)
OVER 12 MONTHS, Fair Value	141,555	67,967
OVER 12 MONTHS, Gross Unrealized (Losses)	(15,671)	(7,228)
TOTAL, Fair Value	257,087	263,783
TOTAL, Gross Unrealized (Losses)	(25,259)	(26,971)
Asset-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	146,906	160,806
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(11,630)	(13,016)
Fair Value	135,276	147,790
LESS THAN 12 MONTHS, Fair Value	59,854	64,886
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(2,236)	(1,838)
OVER 12 MONTHS, Fair Value	75,422	82,904
OVER 12 MONTHS, Gross Unrealized (Losses)	(9,394)	(11,178)
TOTAL, Fair Value	135,276	147,790
TOTAL, Gross Unrealized (Losses)	(11,630)	(13,016)
Mortgage-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	1,554,936	1,581,452
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(219,914)	(232,455)
Fair Value	1,335,022	1,348,997
LESS THAN 12 MONTHS, Fair Value	760,800	816,657
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(88,928)	(106,583)
OVER 12 MONTHS, Fair Value	574,222	532,340
OVER 12 MONTHS, Gross Unrealized (Losses)	(130,986)	(125,872)
TOTAL, Fair Value	1,335,022	1,348,997
TOTAL, Gross Unrealized (Losses)	(219,914)	(232,455)
Total debt securities AFS
Available-for-sale debt securities [Abstract]
Amortized Cost	2,115,921	2,165,719
Gross Unrealized Gains	10	0
Gross Unrealized (Losses)	(268,153)	(282,850)
Fair Value	1,847,778	1,882,869
LESS THAN 12 MONTHS, Fair Value	1,015,911	1,177,471
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(105,421)	(135,759)
OVER 12 MONTHS, Fair Value	830,902	705,398
OVER 12 MONTHS, Gross Unrealized (Losses)	(162,732)	(147,091)
TOTAL, Fair Value	1,846,813	1,882,869
TOTAL, Gross Unrealized (Losses)	$ (268,153)	$ (282,850)

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