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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016
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Held-to-maturity Securities [Abstract] |  |
Amortized cost | $ 582,128 | $ 619,853
Gross unrealized gains | 4,950 | 12,807
Gross unrealized (losses) | (5,157) | (86)
Securities held to maturity | 581,921 | 632,574
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 328,350 | 24,264
LESS THAN 12 MONTHS, Unrealized (Losses) | (5,106) | (55)
OVER 12 MONTHS, Fair Value | 3,026 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (51) | (31)
TOTAL, Fair Value | 331,376 | 26,520
TOTAL, Unrealized (Losses) | (5,157) | (86)
AMORTIZED COST |  |
Due in one year or less | 341 | 472
Due after one year through five years | 17,687 | 12,502
Due after five years through ten years | 152,051 | 157,944
Due after ten years | 294,650 | 315,177
Total | 464,729 | 486,095
Mortgage-backed securities | 117,399 | 133,758
Amortized cost | 582,128 | 619,853
FAIR VALUE |  |
Due in one year or less | 340 | 471
Due after one year through five years | 17,859 | 12,696
Due after five years through ten years | 155,002 | 163,806
Due after ten years | 292,912 | 321,166
Total | 466,113 | 498,139
Mortgage-backed securities | 115,808 | 134,435
Total held to maturity securities | 581,921 | 632,574
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 445,220 | 465,469
Gross unrealized gains | 4,774 | 11,744
Gross unrealized (losses) | (3,519) | (11)
Securities held to maturity | 446,475 | 477,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 208,852 | 1,294
LESS THAN 12 MONTHS, Unrealized (Losses) | (3,495) | (11)
OVER 12 MONTHS, Fair Value | 1,262 | 0
OVER 12 MONTHS, Unrealized (Losses) | (24) | 0
TOTAL, Fair Value | 210,114 | 1,294
TOTAL, Unrealized (Losses) | (3,519) | (11)
AMORTIZED COST |  |
Amortized cost | 445,220 | 465,469
FAIR VALUE |  |
Total held to maturity securities | 446,475 | 477,202
Mortgage-backed Securities [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 117,399 | 133,758
Gross unrealized gains | 0 | 708
Gross unrealized (losses) | (1,591) | (31)
Securities held to maturity | 115,808 | 134,435
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 115,808 | 20,061
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,591) | (31)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 115,808 | 20,061
TOTAL, Unrealized (Losses) | (1,591) | (31)
AMORTIZED COST |  |
Amortized cost | 117,399 | 133,758
FAIR VALUE |  |
Total held to maturity securities | 115,808 | 134,435
Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 19,509 | 20,626
Gross unrealized gains | 176 | 355
Gross unrealized (losses) | (47) | (44)
Securities held to maturity | 19,638 | 20,937
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 3,690 | 2,909
LESS THAN 12 MONTHS, Unrealized (Losses) | (20) | (13)
OVER 12 MONTHS, Fair Value | 1,764 | 2,256
OVER 12 MONTHS, Unrealized (Losses) | (27) | (31)
TOTAL, Fair Value | 5,454 | 5,165
TOTAL, Unrealized (Losses) | (47) | (44)
AMORTIZED COST |  |
Amortized cost | 19,509 | 20,626
FAIR VALUE |  |
Total held to maturity securities | $ 19,638 | $ 20,937

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