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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Available-for-sale debt securities [Abstract]    
Amortized cost $ 1,209,530 $ 1,263,888
Debt securities available for sale 1,214,723 1,272,493
Amortized Cost    
Due in one year or less 666 0
Due after one year through five years 16,081 16,749
Due after five years through ten years 49,732 50,263
Due after ten years 784,981 818,206
Total 851,460 885,218
Mortgage-backed securities 358,070 378,670
Fair Value    
Due in one year or less 667 0
Due after one year through five years 16,403 17,143
Due after five years through ten years 50,850 51,840
Due after ten years 784,683 820,964
Total 852,603 889,947
Mortgage-backed securities 362,120 382,546
Small Business Administration Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 178,500 182,327
Gross unrealized gains 2,446 3,655
Gross unrealized (losses) (26) 0
Debt securities available for sale 180,920 185,982
LESS THAN 12 MONTHS, Fair Value 13,583 10,262
LESS THAN 12 MONTHS, Unrealized (Losses) (26) 0
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 13,583 10,262
TOTAL, Unrealized (Losses) (26) 0
Obligations of States and Political Subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized cost 858 858
Gross unrealized gains 16 16
Gross unrealized (losses) 0 0
Debt securities available for sale 874 874
Non-bank Qualified Obligations of States and Political Subdivisions    
Available-for-sale debt securities [Abstract]    
Amortized cost 369,676 396,430
Gross unrealized gains 5,236 5,030
Gross unrealized (losses) (923) (903)
Debt securities available for sale 373,989 400,557
LESS THAN 12 MONTHS, Fair Value 60,135 66,326
LESS THAN 12 MONTHS, Unrealized (Losses) (226) (177)
OVER 12 MONTHS, Fair Value 50,431 55,428
OVER 12 MONTHS, Unrealized (Losses) (697) (726)
TOTAL, Fair Value 110,566 121,754
TOTAL, Unrealized (Losses) (923) (903)
Asset-backed Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 302,426 305,603
Gross unrealized gains 195 262
Gross unrealized (losses) (5,801) (3,331)
Debt securities available for sale 296,820 302,534
LESS THAN 12 MONTHS, Fair Value 147,594 158,176
LESS THAN 12 MONTHS, Unrealized (Losses) (1,920) (1,823)
OVER 12 MONTHS, Fair Value 124,114 93,259
OVER 12 MONTHS, Unrealized (Losses) (3,881) (1,508)
TOTAL, Fair Value 271,708 251,435
TOTAL, Unrealized (Losses) (5,801) (3,331)
Mortgage-backed Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 358,070 378,670
Gross unrealized gains 5,518 5,731
Gross unrealized (losses) (1,468) (1,855)
Debt securities available for sale 362,120 382,546
LESS THAN 12 MONTHS, Fair Value 1,704 1,713
LESS THAN 12 MONTHS, Unrealized (Losses) 0 (1)
OVER 12 MONTHS, Fair Value 85,715 89,634
OVER 12 MONTHS, Unrealized (Losses) (1,468) (1,854)
TOTAL, Fair Value 87,419 91,347
TOTAL, Unrealized (Losses) (1,468) (1,855)
Debt Securities    
Available-for-sale debt securities [Abstract]    
Amortized cost 1,209,530 1,263,888
Gross unrealized gains 13,411 14,694
Gross unrealized (losses) (8,218) (6,089)
Debt securities available for sale 1,214,723 1,272,493
LESS THAN 12 MONTHS, Fair Value 223,016 236,477
LESS THAN 12 MONTHS, Unrealized (Losses) (2,172) (2,001)
OVER 12 MONTHS, Fair Value 260,260 238,321
OVER 12 MONTHS, Unrealized (Losses) (6,046) (4,088)
TOTAL, Fair Value 483,276 474,798
TOTAL, Unrealized (Losses) $ (8,218) $ (6,089)