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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,464,144 $ 1,244,384
Fair Value 1,480,780 1,268,102
Amortized Cost    
Due in one year or less 245 1,385
Due after one year through five years 17,621 20,805
Due after five years through ten years 51,152 32,441
Due after ten years 841,942 749,874
Total 910,960 804,505
Mortgage-backed securities 553,184 439,879
Fair Value    
Due in one year or less 247 1,398
Due after one year through five years 18,199 21,769
Due after five years through ten years 52,585 34,025
Due after ten years 850,916 757,303
Total 921,947 814,495
Mortgage-backed securities 558,833 453,607
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 166,348 159,722
Gross Unrealized Gains 3,846 5,391
Gross Unrealized (Losses) (188) (158)
Fair Value 170,006 164,955
LESS THAN 12 MONTHS, Fair Value 25,310 32,257
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (24) (102)
OVER 12 MONTHS, Fair Value 31,825 9,875
OVER 12 MONTHS, Gross Unrealized (Losses) (164) (56)
TOTAL, Fair Value 57,135 42,132
TOTAL, Gross Unrealized (Losses) (188) (158)
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 2,807 825
Gross Unrealized Gains 10 16
Gross Unrealized (Losses) (1) 0
Fair Value 2,816 841
LESS THAN 12 MONTHS, Fair Value 1,980  
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (1)  
OVER 12 MONTHS, Fair Value 0  
OVER 12 MONTHS, Gross Unrealized (Losses) 0  
TOTAL, Fair Value 1,980  
TOTAL, Gross Unrealized (Losses) (1)  
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 288,119 314,819
Gross Unrealized Gains 8,285 8,978
Gross Unrealized (Losses) (682) (23)
Fair Value 295,722 323,774
LESS THAN 12 MONTHS, Fair Value 53,328 6,265
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (682) (6)
OVER 12 MONTHS, Fair Value 0 3,103
OVER 12 MONTHS, Gross Unrealized (Losses) 0 (17)
TOTAL, Fair Value 53,328 9,368
TOTAL, Gross Unrealized (Losses) (682) (23)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 453,686 329,139
Gross Unrealized Gains 2,726 2,015
Gross Unrealized (Losses) (3,009) (6,229)
Fair Value 453,403 324,925
LESS THAN 12 MONTHS, Fair Value 75,473 106,474
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (782) (1,089)
OVER 12 MONTHS, Fair Value 189,365 178,686
OVER 12 MONTHS, Gross Unrealized (Losses) (2,227) (5,140)
TOTAL, Fair Value 264,838 285,160
TOTAL, Gross Unrealized (Losses) (3,009) (6,229)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 553,184 439,879
Gross Unrealized Gains 11,613 14,567
Gross Unrealized (Losses) (5,964) (839)
Fair Value 558,833 453,607
LESS THAN 12 MONTHS, Fair Value 291,358 138,338
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (5,088) (839)
OVER 12 MONTHS, Fair Value 35,484 0
OVER 12 MONTHS, Gross Unrealized (Losses) (876) 0
TOTAL, Fair Value 326,842 138,338
TOTAL, Gross Unrealized (Losses) (5,964) (839)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,464,144 1,244,384
Gross Unrealized Gains 26,480 30,967
Gross Unrealized (Losses) (9,844) (7,249)
Fair Value 1,480,780 1,268,102
LESS THAN 12 MONTHS, Fair Value 447,449 283,334
LESS THAN 12 MONTHS, Gross Unrealized (Losses) (6,577) (2,036)
OVER 12 MONTHS, Fair Value 256,674 191,664
OVER 12 MONTHS, Gross Unrealized (Losses) (3,267) (5,213)
TOTAL, Fair Value 704,123 474,998
TOTAL, Gross Unrealized (Losses) $ (9,844) $ (7,249)