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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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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

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