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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Available-for-sale debt securities [Abstract]
Amortized Cost	$ 1,578,313	$ 1,944,298
Fair Value	1,367,340	1,741,221
Amortized Cost
Due in one year or less	380	1,826
Due after one year through five years	1,712	14,772
Due after five years through ten years	27,883	70,894
Due after ten years	368,269	463,257
Total	398,244	550,749
Mortgage-backed securities	1,180,069	1,393,549
Fair Value
Due in one year or less	382	1,796
Due after one year through five years	1,732	14,211
Due after five years through ten years	24,013	63,636
Due after ten years	335,580	430,210
Total	361,707	509,853
Mortgage-backed securities	1,005,633	1,231,368
Corporate securities
Available-for-sale debt securities [Abstract]
Amortized Cost	25,000	25,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(3,875)	(5,250)
Fair Value	21,125	19,750
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	21,125	19,750
OVER 12 MONTHS, Gross Unrealized (Losses)	(3,875)	(5,250)
TOTAL, Fair Value	21,125	19,750
TOTAL, Gross Unrealized (Losses)	(3,875)	(5,250)
SBA securities
Available-for-sale debt securities [Abstract]
Amortized Cost	11,791	86,036
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(1,108)	(4,101)
Fair Value	10,683	81,935
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	10,683	81,935
OVER 12 MONTHS, Gross Unrealized (Losses)	(1,108)	(4,101)
TOTAL, Fair Value	10,683	81,935
TOTAL, Gross Unrealized (Losses)	(1,108)	(4,101)
Obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	162	501
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(1)	(21)
Fair Value	161	480
LESS THAN 12 MONTHS, Fair Value	161	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(1)	0
OVER 12 MONTHS, Fair Value	0	280
OVER 12 MONTHS, Gross Unrealized (Losses)	0	(21)
TOTAL, Fair Value	161	280
TOTAL, Gross Unrealized (Losses)	(1)	(21)
Non-bank qualified obligations of states and political subdivisions
Available-for-sale debt securities [Abstract]
Amortized Cost	218,328	246,233
Gross Unrealized Gains	23	44
Gross Unrealized (Losses)	(28,806)	(28,287)
Fair Value	189,545	217,990
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	187,593	215,956
OVER 12 MONTHS, Gross Unrealized (Losses)	(28,806)	(28,287)
TOTAL, Fair Value	187,593	215,956
TOTAL, Gross Unrealized (Losses)	(28,806)	(28,287)
Asset-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	142,963	192,979
Gross Unrealized Gains	11	337
Gross Unrealized (Losses)	(2,782)	(3,618)
Fair Value	140,192	189,698
LESS THAN 12 MONTHS, Fair Value	66,794	52,101
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(725)	(176)
OVER 12 MONTHS, Fair Value	68,015	88,576
OVER 12 MONTHS, Gross Unrealized (Losses)	(2,057)	(3,442)
TOTAL, Fair Value	134,809	140,677
TOTAL, Gross Unrealized (Losses)	(2,782)	(3,618)
Mortgage-backed securities
Available-for-sale debt securities [Abstract]
Amortized Cost	1,180,069	1,393,549
Gross Unrealized Gains	17	84
Gross Unrealized (Losses)	(174,452)	(162,265)
Fair Value	1,005,634	1,231,368
LESS THAN 12 MONTHS, Fair Value	13,041	2,377
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(111)	(15)
OVER 12 MONTHS, Fair Value	990,596	1,215,781
OVER 12 MONTHS, Gross Unrealized (Losses)	(174,341)	(162,250)
TOTAL, Fair Value	1,003,637	1,218,158
TOTAL, Gross Unrealized (Losses)	(174,452)	(162,265)
Total debt securities AFS
Available-for-sale debt securities [Abstract]
Amortized Cost	1,578,313	1,944,298
Gross Unrealized Gains	51	465
Gross Unrealized (Losses)	(211,024)	(203,542)
Fair Value	1,367,340	1,741,221
LESS THAN 12 MONTHS, Fair Value	79,996	54,478
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(837)	(191)
OVER 12 MONTHS, Fair Value	1,278,012	1,622,278
OVER 12 MONTHS, Gross Unrealized (Losses)	(210,187)	(203,351)
TOTAL, Fair Value	1,358,008	1,676,756
TOTAL, Gross Unrealized (Losses)	$ (211,024)	$ (203,542)

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