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SECURITIES - Held to Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Held-to-maturity Securities [Abstract]    
Amortized cost $ 582,128 $ 619,853
Gross unrealized gains 4,950 12,807
Gross unrealized (losses) (5,157) (86)
Securities held to maturity 581,921 632,574
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 328,350 24,264
LESS THAN 12 MONTHS, Unrealized (Losses) (5,106) (55)
OVER 12 MONTHS, Fair Value 3,026 2,256
OVER 12 MONTHS, Unrealized (Losses) (51) (31)
TOTAL, Fair Value 331,376 26,520
TOTAL, Unrealized (Losses) (5,157) (86)
AMORTIZED COST    
Due in one year or less 341 472
Due after one year through five years 17,687 12,502
Due after five years through ten years 152,051 157,944
Due after ten years 294,650 315,177
Total 464,729 486,095
Mortgage-backed securities 117,399 133,758
Amortized cost 582,128 619,853
FAIR VALUE    
Due in one year or less 340 471
Due after one year through five years 17,859 12,696
Due after five years through ten years 155,002 163,806
Due after ten years 292,912 321,166
Total 466,113 498,139
Mortgage-backed securities 115,808 134,435
Total held to maturity securities 581,921 632,574
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 445,220 465,469
Gross unrealized gains 4,774 11,744
Gross unrealized (losses) (3,519) (11)
Securities held to maturity 446,475 477,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 208,852 1,294
LESS THAN 12 MONTHS, Unrealized (Losses) (3,495) (11)
OVER 12 MONTHS, Fair Value 1,262 0
OVER 12 MONTHS, Unrealized (Losses) (24) 0
TOTAL, Fair Value 210,114 1,294
TOTAL, Unrealized (Losses) (3,519) (11)
AMORTIZED COST    
Amortized cost 445,220 465,469
FAIR VALUE    
Total held to maturity securities 446,475 477,202
Mortgage-backed Securities [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 117,399 133,758
Gross unrealized gains 0 708
Gross unrealized (losses) (1,591) (31)
Securities held to maturity 115,808 134,435
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 115,808 20,061
LESS THAN 12 MONTHS, Unrealized (Losses) (1,591) (31)
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 115,808 20,061
TOTAL, Unrealized (Losses) (1,591) (31)
AMORTIZED COST    
Amortized cost 117,399 133,758
FAIR VALUE    
Total held to maturity securities 115,808 134,435
Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 19,509 20,626
Gross unrealized gains 176 355
Gross unrealized (losses) (47) (44)
Securities held to maturity 19,638 20,937
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 3,690 2,909
LESS THAN 12 MONTHS, Unrealized (Losses) (20) (13)
OVER 12 MONTHS, Fair Value 1,764 2,256
OVER 12 MONTHS, Unrealized (Losses) (27) (31)
TOTAL, Fair Value 5,454 5,165
TOTAL, Unrealized (Losses) (47) (44)
AMORTIZED COST    
Amortized cost 19,509 20,626
FAIR VALUE    
Total held to maturity securities $ 19,638 $ 20,937