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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Available-for-sale debt securities [Abstract]    
Amortized cost $ 1,192,505 $ 1,263,888
Debt securities available for sale 1,195,619 1,272,493
Amortized Cost    
Due in one year or less 1,130 0
Due after one year through five years 12,689 16,749
Due after five years through ten years 45,180 50,263
Due after ten years 790,771 818,206
Total 849,770 885,218
Mortgage-backed securities 342,735 378,670
Fair Value    
Due in one year or less 1,138 0
Due after one year through five years 13,067 17,143
Due after five years through ten years 47,086 51,840
Due after ten years 779,234 820,964
Total 840,525 889,947
Mortgage-backed securities 355,094 382,546
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 7,438
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 92,418 111,171
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 767 1,410
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 92,418 118,609
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 767 1,416
Small Business Administration Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 168,697 182,327
Gross unrealized gains 4,569 3,655
Gross unrealized (losses) (20) 0
Debt securities available for sale 173,246 185,982
LESS THAN 12 MONTHS, Fair Value 19,536 10,262
LESS THAN 12 MONTHS, Unrealized (Losses) (20) 0
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 19,536 10,262
TOTAL, Unrealized (Losses) (20) 0
Obligations of States and Political Subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized cost 858 858
Gross unrealized gains 14 16
Gross unrealized (losses) 0 0
Debt securities available for sale 872 874
Non-bank Qualified Obligations of States and Political Subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized cost 341,080 396,430
Gross unrealized gains 5,587 5,030
Gross unrealized (losses) (497) (903)
Debt securities available for sale 346,170 400,557
LESS THAN 12 MONTHS, Fair Value 27,484 66,326
LESS THAN 12 MONTHS, Unrealized (Losses) (37) (177)
OVER 12 MONTHS, Fair Value 46,259 55,428
OVER 12 MONTHS, Unrealized (Losses) (460) (726)
TOTAL, Fair Value 73,743 121,754
TOTAL, Unrealized (Losses) (497) (903)
Fair Value    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 5,967
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 92,418 109,368
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 767 1,397
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 92,418 115,335
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 767 1,403
Asset-backed Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 339,135 305,603
Gross unrealized gains 0 262
Gross unrealized (losses) (18,898) (3,331)
Debt securities available for sale 320,237 302,534
LESS THAN 12 MONTHS, Fair Value 196,361 158,176
LESS THAN 12 MONTHS, Unrealized (Losses) (7,499) (1,823)
OVER 12 MONTHS, Fair Value 123,876 93,259
OVER 12 MONTHS, Unrealized (Losses) (11,399) (1,508)
TOTAL, Fair Value 320,237 251,435
TOTAL, Unrealized (Losses) (18,898) (3,331)
Mortgage-backed Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 342,735 378,670
Gross unrealized gains 12,359 5,731
Gross unrealized (losses) 0 (1,855)
Debt securities available for sale 355,094 382,546
LESS THAN 12 MONTHS, Fair Value   1,713
LESS THAN 12 MONTHS, Unrealized (Losses)   (1)
OVER 12 MONTHS, Fair Value   89,634
OVER 12 MONTHS, Unrealized (Losses)   (1,854)
TOTAL, Fair Value   91,347
TOTAL, Unrealized (Losses)   (1,855)
Fair Value    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value   1,471
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value   1,803
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   13
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value   3,274
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss   13
Debt Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 1,192,505 1,263,888
Gross unrealized gains 22,529 14,694
Gross unrealized (losses) (19,415) (6,089)
Debt securities available for sale 1,195,619 1,272,493
LESS THAN 12 MONTHS, Fair Value 243,381 236,477
LESS THAN 12 MONTHS, Unrealized (Losses) (7,556) (2,001)
OVER 12 MONTHS, Fair Value 170,135 238,321
OVER 12 MONTHS, Unrealized (Losses) (11,859) (4,088)
TOTAL, Fair Value 413,516 474,798
TOTAL, Unrealized (Losses) $ (19,415) $ (6,089)