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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 2,101,149 $ 2,143,333
Fair Value 1,850,581 1,804,228
Amortized Cost    
Due in one year or less 3,597 5,023
Due after one year through five years 11,172 11,175
Due after five years through ten years 79,137 79,139
Due after ten years 535,867 552,360
Total 629,773 647,697
Mortgage-backed securities 1,471,376 1,495,636
Fair Value    
Due in one year or less 3,579 4,971
Due after one year through five years 10,523 10,292
Due after five years through ten years 68,613 66,428
Due after ten years 492,288 497,012
Total 575,003 578,703
Mortgage-backed securities 1,275,578 1,225,525
Corporate securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 25,000 25,000
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,625) (6,750)
Fair Value 18,375 18,250
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 18,375 18,250
OVER 12 MONTHS, Gross Unrealized (Losses) (6,625) (6,750)
TOTAL, Fair Value 18,375 18,250
TOTAL, Gross Unrealized (Losses) (6,625) (6,750)
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 94,458 95,549
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,726) (10,307)
Fair Value 87,732 85,242
LESS THAN 12 MONTHS, Fair Value 23,502 22,327
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (742) (1,919)
OVER 12 MONTHS, Fair Value 64,229 62,915
OVER 12 MONTHS, Gross Unrealized (Losses) (5,984) (8,388)
TOTAL, Fair Value 87,731 85,242
TOTAL, Gross Unrealized (Losses) (6,726) (10,307)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,351 2,368
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (47) (79)
Fair Value 2,304 2,289
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Gross Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 2,304 2,289
OVER 12 MONTHS, Gross Unrealized (Losses) (47) (79)
TOTAL, Fair Value 2,304 2,289
TOTAL, Gross Unrealized (Losses) (47) (79)
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 262,999 269,396
Gross Unrealized Gains 25 0
Gross Unrealized (Losses) (34,136) (42,673)
Fair Value 228,888 226,723
LESS THAN 12 MONTHS, Fair Value 1,616 5,010
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (18) (83)
OVER 12 MONTHS, Fair Value 225,198 221,714
OVER 12 MONTHS, Gross Unrealized (Losses) (34,118) (42,590)
TOTAL, Fair Value 226,814 226,723
TOTAL, Gross Unrealized (Losses) (34,136) (42,673)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 244,965 255,384
Gross Unrealized Gains 96 234
Gross Unrealized (Losses) (7,357) (9,419)
Fair Value 237,704 246,199
LESS THAN 12 MONTHS, Fair Value 86,695 46,528
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (257) (224)
OVER 12 MONTHS, Fair Value 112,043 115,608
OVER 12 MONTHS, Gross Unrealized (Losses) (7,100) (9,195)
TOTAL, Fair Value 198,738 162,136
TOTAL, Gross Unrealized (Losses) (7,357) (9,419)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,471,376 1,495,636
Gross Unrealized Gains 27 0
Gross Unrealized (Losses) (195,825) (270,111)
Fair Value 1,275,578 1,225,525
LESS THAN 12 MONTHS, Fair Value 17,688 18,311
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (245) (944)
OVER 12 MONTHS, Fair Value 1,256,811 1,207,214
OVER 12 MONTHS, Gross Unrealized (Losses) (195,580) (269,167)
TOTAL, Fair Value 1,274,499 1,225,525
TOTAL, Gross Unrealized (Losses) (195,825) (270,111)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,101,149 2,143,333
Gross Unrealized Gains 148 234
Gross Unrealized (Losses) (250,716) (339,339)
Fair Value 1,850,581 1,804,228
LESS THAN 12 MONTHS, Fair Value 129,501 92,176
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1,262) (3,170)
OVER 12 MONTHS, Fair Value 1,678,960 1,627,990
OVER 12 MONTHS, Gross Unrealized (Losses) (249,454) (336,169)
TOTAL, Fair Value 1,808,461 1,720,165
TOTAL, Gross Unrealized (Losses) $ (250,716) $ (339,339)