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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,897,889 $ 1,244,384
Fair Value 1,917,605 1,268,102
Amortized Cost    
Due in one year or less 245 1,385
Due after one year through five years 17,884 20,805
Due after five years through ten years 53,273 32,441
Due after ten years 767,166 749,874
Total 838,568 804,505
Mortgage-backed securities 1,059,321 439,879
Fair Value    
Due in one year or less 245 1,398
Due after one year through five years 18,467 21,769
Due after five years through ten years 55,337 34,025
Due after ten years 779,974 757,303
Total 854,023 814,495
Mortgage-backed securities 1,063,582 453,607
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 162,922 159,722
Gross Unrealized Gains 6,263 5,391
Gross Unrealized (Losses) 0 (158)
Fair Value 169,185 164,955
LESS THAN 12 MONTHS, Fair Value   32,257
LESS THAN 12 MONTHS, Gross Unrealized (Losses)   (102)
OVER 12 MONTHS, Fair Value   9,875
OVER 12 MONTHS, Gross Unrealized (Losses)   (56)
TOTAL, Fair Value   42,132
TOTAL, Gross Unrealized (Losses)   (158)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,758 825
Gross Unrealized Gains 8 16
Gross Unrealized (Losses) 0 0
Fair Value 2,766 841
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 267,031 314,819
Gross Unrealized Gains 7,423 8,978
Gross Unrealized (Losses) (104) (23)
Fair Value 274,350 323,774
LESS THAN 12 MONTHS, Fair Value 24,357 6,265
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (104) (6)
OVER 12 MONTHS, Fair Value 0 3,103
OVER 12 MONTHS, Gross Unrealized (Losses) 0 (17)
TOTAL, Fair Value 24,357 9,368
TOTAL, Gross Unrealized (Losses) (104) (23)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 405,857 329,139
Gross Unrealized Gains 2,760 2,015
Gross Unrealized (Losses) (895) (6,229)
Fair Value 407,722 324,925
LESS THAN 12 MONTHS, Fair Value 124,158 106,474
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (234) (1,089)
OVER 12 MONTHS, Fair Value 94,726 178,686
OVER 12 MONTHS, Gross Unrealized (Losses) (661) (5,140)
TOTAL, Fair Value 218,884 285,160
TOTAL, Gross Unrealized (Losses) (895) (6,229)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,059,321 439,879
Gross Unrealized Gains 9,866 14,567
Gross Unrealized (Losses) (5,605) (839)
Fair Value 1,063,582 453,607
LESS THAN 12 MONTHS, Fair Value 695,230 138,338
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (4,207) (839)
OVER 12 MONTHS, Fair Value 55,415 0
OVER 12 MONTHS, Gross Unrealized (Losses) (1,398) 0
TOTAL, Fair Value 750,645 138,338
TOTAL, Gross Unrealized (Losses) (5,605) (839)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,897,889 1,244,384
Gross Unrealized Gains 26,320 30,967
Gross Unrealized (Losses) (6,604) (7,249)
Fair Value 1,917,605 1,268,102
LESS THAN 12 MONTHS, Fair Value 843,745 283,334
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (4,545) (2,036)
OVER 12 MONTHS, Fair Value 150,141 191,664
OVER 12 MONTHS, Gross Unrealized (Losses) (2,059) (5,213)
TOTAL, Fair Value 993,886 474,998
TOTAL, Gross Unrealized (Losses) $ (6,604) $ (7,249)