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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
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Held-to-maturity Securities [Abstract] |  |
Amortized cost | $ 604,976 | $ 619,853
Gross unrealized gains | 1,371 | 12,807
Gross unrealized (losses) | (7,246) | (86)
Securities held to maturity | 599,101 | 632,574
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 495,052 | 24,264
LESS THAN 12 MONTHS, Unrealized (Losses) | (7,198) | (55)
OVER 12 MONTHS, Fair Value | 2,236 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (48) | (31)
TOTAL, Fair Value | 497,288 | 26,520
TOTAL, Unrealized (Losses) | (7,246) | (86)
AMORTIZED COST |  |
Due in one year or less | 341 | 472
Due after one year through five years | 12,648 | 12,502
Due after five years through ten years | 157,174 | 157,944
Due after ten years | 308,448 | 315,177
Total | 478,611 | 486,095
Mortgage-backed securities | 126,365 | 133,758
Amortized cost | 604,976 | 619,853
FAIR VALUE |  |
Due in one year or less | 341 | 471
Due after one year through five years | 12,618 | 12,696
Due after five years through ten years | 156,228 | 163,806
Due after ten years | 305,445 | 321,166
Total | 474,632 | 498,139
Mortgage-backed securities | 124,469 | 134,435
Securities held to maturity | 599,101 | 632,574
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 458,259 | 465,469
Gross unrealized gains | 1,326 | 11,744
Gross unrealized (losses) | (5,072) | (11)
Securities held to maturity | 454,513 | 477,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 356,031 | 1,294
LESS THAN 12 MONTHS, Unrealized (Losses) | (5,072) | (11)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 356,031 | 1,294
TOTAL, Unrealized (Losses) | (5,072) | (11)
AMORTIZED COST |  |
Amortized cost | 458,259 | 465,469
FAIR VALUE |  |
Securities held to maturity | 454,513 | 477,202
Mortgage-backed Securities [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 126,365 | 133,758
Gross unrealized gains | 0 | 708
Gross unrealized (losses) | (1,896) | (31)
Securities held to maturity | 124,469 | 134,435
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 124,469 | 20,061
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,896) | (31)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 124,469 | 20,061
TOTAL, Unrealized (Losses) | (1,896) | (31)
AMORTIZED COST |  |
Amortized cost | 126,365 | 133,758
FAIR VALUE |  |
Securities held to maturity | 124,469 | 134,435
Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 20,352 | 20,626
Gross unrealized gains | 45 | 355
Gross unrealized (losses) | (278) | (44)
Securities held to maturity | 20,119 | 20,937
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 14,552 | 2,909
LESS THAN 12 MONTHS, Unrealized (Losses) | (230) | (13)
OVER 12 MONTHS, Fair Value | 2,236 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (48) | (31)
TOTAL, Fair Value | 16,788 | 5,165
TOTAL, Unrealized (Losses) | (278) | (44)
AMORTIZED COST |  |
Amortized cost | 20,352 | 20,626
FAIR VALUE |  |
Securities held to maturity | $ 20,119 | $ 20,937

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