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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
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Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized cost | $ 224,378 | $ 563,529
Gross unrealized gains | 89 | 4,901
Gross unrealized (losses) | (10,309) | (4,245)
Securities held to maturity | 214,158 | 564,185
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 119,644 | 315,838
LESS THAN 12 MONTHS, Unrealized (Losses) | (5,143) | (4,022)
OVER 12 MONTHS, Fair Value | 88,411 | 10,295
OVER 12 MONTHS, Unrealized (Losses) | (5,166) | (223)
TOTAL, Fair Value | 208,055 | 326,133
TOTAL, Unrealized (Losses) | (10,309) | (4,245)
AMORTIZED COST |  |
Due in one year or less | 2,395 | 1,483
Due after one year through five years | 18,829 | 17,926
Due after five years through ten years | 20,335 | 144,996
Due after ten years | 174,601 | 285,435
Total | 216,160 | 449,840
Mortgage-backed securities | 8,218 | 113,689
Amortized cost | 224,378 | 563,529
FAIR VALUE |  |
Due in one year or less | 2,390 | 1,480
Due after one year through five years | 18,761 | 18,160
Due after five years through ten years | 20,175 | 147,832
Due after ten years | 164,986 | 284,257
Total | 206,312 | 451,729
Mortgage-backed securities | 7,846 | 112,456
Total held to maturity securities | 214,158 | 564,185
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized cost | 212,329 | 430,593
Gross unrealized gains | 73 | 4,744
Gross unrealized (losses) | (9,916) | (2,976)
Securities held to maturity | 202,486 | 432,361
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 118,237 | 202,018
LESS THAN 12 MONTHS, Unrealized (Losses) | (5,141) | (2,783)
OVER 12 MONTHS, Fair Value | 79,222 | 6,206
OVER 12 MONTHS, Unrealized (Losses) | (4,775) | (193)
TOTAL, Fair Value | 197,459 | 208,224
TOTAL, Unrealized (Losses) | (9,916) | (2,976)
AMORTIZED COST |  |
Amortized cost | 212,329 | 430,593
FAIR VALUE |  |
Total held to maturity securities | 202,486 | 432,361
Mortgage-backed Securities [Member] |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized cost | 8,218 | 113,689
Gross unrealized gains | 0 | 0
Gross unrealized (losses) | (372) | (1,233)
Securities held to maturity | 7,846 | 112,456
Debt Securities, Held-to-maturity, 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 | 7,847 | 0
OVER 12 MONTHS, Unrealized (Losses) | (372) | 0
TOTAL, Fair Value | 7,847 | 112,456
TOTAL, Unrealized (Losses) | (372) | (1,233)
AMORTIZED COST |  |
Amortized cost | 8,218 | 113,689
FAIR VALUE |  |
Total held to maturity securities | 7,846 | 112,456
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized cost | 3,831 | 19,247
Gross unrealized gains | 16 | 157
Gross unrealized (losses) | (21) | (36)
Securities held to maturity | 3,826 | 19,368
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,407 | 1,364
LESS THAN 12 MONTHS, Unrealized (Losses) | (2) | (6)
OVER 12 MONTHS, Fair Value | 1,342 | 4,089
OVER 12 MONTHS, Unrealized (Losses) | (19) | (30)
TOTAL, Fair Value | 2,749 | 5,453
TOTAL, Unrealized (Losses) | (21) | (36)
AMORTIZED COST |  |
Amortized cost | 3,831 | 19,247
FAIR VALUE |  |
Total held to maturity securities | $ 3,826 | $ 19,368

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