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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Available-for-sale debt securities [Abstract]    
Amortized Cost $ 1,152,648 $ 1,263,888
Fair Value 1,163,829 1,272,493
Amortized Cost    
Due in one year or less 1,130 0
Due after one year through five years 12,688 16,749
Due after five years through ten years 44,891 50,263
Due after ten years 768,914 818,206
Total 827,623 885,218
Mortgage-backed securities 325,025 378,670
Fair Value    
Due in one year or less 1,133 0
Due after one year through five years 13,205 17,143
Due after five years through ten years 47,174 51,840
Due after ten years 764,067 820,964
Total 825,579 889,947
Mortgage-backed securities 338,250 382,546
SBA securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 165,299 182,327
Gross Unrealized Gains 5,109 3,655
Gross Unrealized (Losses) (141) 0
Fair Value 170,267 185,982
LESS THAN 12 MONTHS, Fair Value 34,402 10,262
LESS THAN 12 MONTHS, Unrealized (Losses) (141) 0
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 34,402 10,262
TOTAL, Unrealized (Losses) (141) 0
Obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 826 858
Gross Unrealized Gains 17 16
Gross Unrealized (Losses) 0 0
Fair Value 843 874
Non-bank qualified obligations of states and political subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized Cost 327,423 396,430
Gross Unrealized Gains 4,803 5,030
Gross Unrealized (Losses) (902) (903)
Fair Value 331,324 400,557
LESS THAN 12 MONTHS, Fair Value 46,805 66,326
LESS THAN 12 MONTHS, Unrealized (Losses) (279) (177)
OVER 12 MONTHS, Fair Value 40,425 55,428
OVER 12 MONTHS, Unrealized (Losses) (623) (726)
TOTAL, Fair Value 87,230 121,754
TOTAL, Unrealized (Losses) (902) (903)
Asset-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 334,075 305,603
Gross Unrealized Gains 1,575 262
Gross Unrealized (Losses) (12,505) (3,331)
Fair Value 323,145 302,534
LESS THAN 12 MONTHS, Fair Value 103,915 158,176
LESS THAN 12 MONTHS, Unrealized (Losses) (2,423) (1,823)
OVER 12 MONTHS, Fair Value 178,986 93,259
OVER 12 MONTHS, Unrealized (Losses) (10,082) (1,508)
TOTAL, Fair Value 282,901 251,435
TOTAL, Unrealized (Losses) (12,505) (3,331)
Mortgage-backed securities    
Available-for-sale debt securities [Abstract]    
Amortized Cost 325,025 378,670
Gross Unrealized Gains 13,381 5,731
Gross Unrealized (Losses) (156) (1,855)
Fair Value 338,250 382,546
LESS THAN 12 MONTHS, Fair Value 32,214 1,713
LESS THAN 12 MONTHS, Unrealized (Losses) (156) (1)
OVER 12 MONTHS, Fair Value 0 89,634
OVER 12 MONTHS, Unrealized (Losses) 0 (1,854)
TOTAL, Fair Value 32,214 91,347
TOTAL, Unrealized (Losses) (156) (1,855)
Total debt securities AFS    
Available-for-sale debt securities [Abstract]    
Amortized Cost 1,152,648 1,263,888
Gross Unrealized Gains 24,885 14,694
Gross Unrealized (Losses) (13,704) (6,089)
Fair Value 1,163,829 1,272,493
LESS THAN 12 MONTHS, Fair Value 217,336 236,477
LESS THAN 12 MONTHS, Unrealized (Losses) (2,999) (2,001)
OVER 12 MONTHS, Fair Value 219,411 238,321
OVER 12 MONTHS, Unrealized (Losses) (10,705) (4,088)
TOTAL, Fair Value 436,747 474,798
TOTAL, Unrealized (Losses) $ (13,704) $ (6,089)