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SECURITIES - Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Held-to-maturity Securities [Abstract]    
Amortized cost $ 596,803 $ 619,853
Gross unrealized gains 2,468 12,807
Gross unrealized (losses) (4,848) (86)
Securities held to maturity 594,423 632,574
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 416,915 24,264
LESS THAN 12 MONTHS, Unrealized (Losses) (4,828) (55)
OVER 12 MONTHS, Fair Value 1,329 2,256
OVER 12 MONTHS, Unrealized (Losses) (20) (31)
TOTAL, Fair Value 418,244 26,520
TOTAL, Unrealized (Losses) (4,848) (86)
AMORTIZED COST    
Due in one year or less 341 472
Due after one year through five years 17,723 12,502
Due after five years through ten years 152,790 157,944
Due after ten years 303,452 315,177
Total 474,306 486,095
Mortgage-backed securities 122,497 133,758
Amortized cost 596,803 619,853
FAIR VALUE    
Due in one year or less 340 471
Due after one year through five years 17,814 12,696
Due after five years through ten years 153,428 163,806
Due after ten years 301,861 321,166
Total 473,443 498,139
Mortgage-backed securities 120,980 134,435
Total held to maturity securities 594,423 632,574
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 454,129 465,469
Gross unrealized gains 2,397 11,744
Gross unrealized (losses) (3,188) (11)
Securities held to maturity 453,338 477,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 283,033 1,294
LESS THAN 12 MONTHS, Unrealized (Losses) (3,188) (11)
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 283,033 1,294
TOTAL, Unrealized (Losses) (3,188) (11)
AMORTIZED COST    
Amortized cost 454,129 465,469
FAIR VALUE    
Total held to maturity securities 453,338 477,202
Mortgage-backed Securities [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 122,497 133,758
Gross unrealized gains 0 708
Gross unrealized (losses) (1,517) (31)
Securities held to maturity 120,980 134,435
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 120,980 20,061
LESS THAN 12 MONTHS, Unrealized (Losses) (1,517) (31)
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 120,980 20,061
TOTAL, Unrealized (Losses) (1,517) (31)
AMORTIZED COST    
Amortized cost 122,497 133,758
FAIR VALUE    
Total held to maturity securities 120,980 134,435
Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 20,177 20,626
Gross unrealized gains 71 355
Gross unrealized (losses) (143) (44)
Securities held to maturity 20,105 20,937
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 12,902 2,909
LESS THAN 12 MONTHS, Unrealized (Losses) (123) (13)
OVER 12 MONTHS, Fair Value 1,329 2,256
OVER 12 MONTHS, Unrealized (Losses) (20) (31)
TOTAL, Fair Value 14,231 5,165
TOTAL, Unrealized (Losses) (143) (44)
AMORTIZED COST    
Amortized cost 20,177 20,626
FAIR VALUE    
Total held to maturity securities $ 20,105 $ 20,937