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SECURITIES - Held to Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Held-to-maturity Securities [Abstract]    
Amortized cost $ 243,492 $ 563,529
Gross unrealized gains 362 4,901
Gross unrealized (losses) (3,710) (4,245)
Securities held to maturity 240,144 564,185
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 116,260 315,838
LESS THAN 12 MONTHS, Unrealized (Losses) (1,792) (4,022)
OVER 12 MONTHS, Fair Value 91,280 10,295
OVER 12 MONTHS, Unrealized (Losses) (1,918) (223)
TOTAL, Fair Value 207,540 326,133
TOTAL, Unrealized (Losses) (3,710) (4,245)
AMORTIZED COST    
Due in one year or less 2,674 1,483
Due after one year through five years 11,864 17,926
Due after five years through ten years 27,919 144,996
Due after ten years 192,567 285,435
Total 235,024 449,840
Mortgage-backed securities 8,468 113,689
Amortized cost 243,492 563,529
FAIR VALUE    
Due in one year or less 2,662 1,480
Due after one year through five years 11,895 18,160
Due after five years through ten years 28,206 147,832
Due after ten years 189,061 284,257
Total 231,824 451,729
Mortgage-backed securities 8,320 112,456
Total held to maturity securities 240,144 564,185
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 230,683 430,593
Gross unrealized gains 336 4,744
Gross unrealized (losses) (3,537) (2,976)
Securities held to maturity 227,482 432,361
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 114,999 202,018
LESS THAN 12 MONTHS, Unrealized (Losses) (1,789) (2,783)
OVER 12 MONTHS, Fair Value 80,813 6,206
OVER 12 MONTHS, Unrealized (Losses) (1,748) (193)
TOTAL, Fair Value 195,812 208,224
TOTAL, Unrealized (Losses) (3,537) (2,976)
AMORTIZED COST    
Amortized cost 230,683 430,593
FAIR VALUE    
Total held to maturity securities 227,482 432,361
Mortgage-backed Securities [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 8,468 113,689
Gross unrealized gains 0 0
Gross unrealized (losses) (148) (1,233)
Securities held to maturity 8,320 112,456
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 8,320 0
OVER 12 MONTHS, Unrealized (Losses) (148) 0
TOTAL, Fair Value 8,320 112,456
TOTAL, Unrealized (Losses) (148) (1,233)
AMORTIZED COST    
Amortized cost 8,468 113,689
FAIR VALUE    
Total held to maturity securities 8,320 112,456
Obligations of States and Political Subdivisions [Member]    
Held-to-maturity Securities [Abstract]    
Amortized cost 4,341 19,247
Gross unrealized gains 26 157
Gross unrealized (losses) (25) (36)
Securities held to maturity 4,342 19,368
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 1,261 1,364
LESS THAN 12 MONTHS, Unrealized (Losses) (3) (6)
OVER 12 MONTHS, Fair Value 2,147 4,089
OVER 12 MONTHS, Unrealized (Losses) (22) (30)
TOTAL, Fair Value 3,408 5,453
TOTAL, Unrealized (Losses) (25) (36)
AMORTIZED COST    
Amortized cost 4,341 19,247
FAIR VALUE    
Total held to maturity securities $ 4,342 $ 19,368