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SECURITIES - Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Held-to-maturity Securities [Abstract]    
Amortized cost $ 235,011 $ 563,529
Gross unrealized gains 85 4,901
Gross unrealized (losses) (8,546) (4,245)
Securities held to maturity 226,550 564,185
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 134,752 315,838
LESS THAN 12 MONTHS, Unrealized (Losses) (4,472) (4,022)
OVER 12 MONTHS, Fair Value 86,252 10,295
OVER 12 MONTHS, Unrealized (Losses) (4,074) (223)
TOTAL, Fair Value 221,004 326,133
TOTAL, Unrealized (Losses) (8,546) (4,245)
AMORTIZED COST    
Due in one year or less 2,267 1,483
Due after one year through five years 16,641 17,926
Due after five years through ten years 22,949 144,996
Due after ten years 184,761 285,435
Total 226,618 449,840
Mortgage-backed securities 8,393 113,689
Amortized cost 235,011 563,529
FAIR VALUE    
Due in one year or less 2,260 1,480
Due after one year through five years 16,572 18,160
Due after five years through ten years 22,695 147,832
Due after ten years 176,962 284,257
Total 218,489 451,729
Mortgage-backed securities 8,061 112,456
Total held to maturity securities 226,550 564,185
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 222,684 430,593
Gross unrealized gains 68 4,744
Gross unrealized (losses) (8,189) (2,976)
Securities held to maturity 214,563 432,361
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 133,070 202,018
LESS THAN 12 MONTHS, Unrealized (Losses) (4,468) (2,783)
OVER 12 MONTHS, Fair Value 76,449 6,206
OVER 12 MONTHS, Unrealized (Losses) (3,721) (193)
TOTAL, Fair Value 209,519 208,224
TOTAL, Unrealized (Losses) (8,189) (2,976)
AMORTIZED COST    
Amortized cost 222,684 430,593
FAIR VALUE    
Total held to maturity securities 214,563 432,361
Mortgage-backed Securities [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 8,393 113,689
Gross unrealized gains 0 0
Gross unrealized (losses) (332) (1,233)
Securities held to maturity 8,061 112,456
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 112,456
LESS THAN 12 MONTHS, Unrealized (Losses) 0 (1,233)
OVER 12 MONTHS, Fair Value 8,061 0
OVER 12 MONTHS, Unrealized (Losses) (332) 0
TOTAL, Fair Value 8,061 112,456
TOTAL, Unrealized (Losses) (332) (1,233)
AMORTIZED COST    
Amortized cost 8,393 113,689
FAIR VALUE    
Total held to maturity securities 8,061 112,456
Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 3,934 19,247
Gross unrealized gains 17 157
Gross unrealized (losses) (25) (36)
Securities held to maturity 3,926 19,368
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 1,682 1,364
LESS THAN 12 MONTHS, Unrealized (Losses) (4) (6)
OVER 12 MONTHS, Fair Value 1,742 4,089
OVER 12 MONTHS, Unrealized (Losses) (21) (30)
TOTAL, Fair Value 3,424 5,453
TOTAL, Unrealized (Losses) (25) (36)
AMORTIZED COST    
Amortized cost 3,934 19,247
FAIR VALUE    
Total held to maturity securities $ 3,926 $ 19,368