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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Sep. 30, 2015
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Held-to-maturity Securities [Abstract] |  |
Amortized cost | $ 604,589 | $ 345,744
Gross unrealized gains | 13,583 | 2,182
Gross unrealized (losses) | (22) | (1,079)
Fair value | 618,150 | 346,847
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 89,700
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (442)
OVER 12 MONTHS, Fair Value | 2,266 | 72,695
OVER 12 MONTHS, Unrealized (Losses) | (22) | (637)
TOTAL, Fair Value | 2,266 | 162,395
TOTAL, Unrealized (Losses) | (22) | (1,079)
AMORTIZED COST [Abstract] |  |
Due in one year or less | 231 | 95
Due after one year through five years | 11,586 | 8,411
Due after five years through ten years | 147,795 | 140,145
Due after ten years | 305,839 | 130,516
Total | 465,451 | 279,167
Mortgage-backed securities | 139,138 | 66,577
Amortized cost | 604,589 | 345,744
FAIR VALUE [Abstract] |  |
Due in one year or less | 231 | 96
Due after one year through five years | 11,810 | 8,430
Due after five years through ten years | 153,986 | 140,505
Due after ten years | 312,365 | 131,712
Total | 478,392 | 280,743
Mortgage-backed securities | 139,758 | 66,104
Total held to maturity securities | 618,150 | 346,847
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 444,807 | 259,627
Gross unrealized gains | 12,529 | 2,122
Gross unrealized (losses) | 0 | (419)
Fair value | 457,336 | 261,330
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 78,663
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (365)
OVER 12 MONTHS, Fair Value |  | 4,136
OVER 12 MONTHS, Unrealized (Losses) |  | (54)
TOTAL, Fair Value |  | 82,799
TOTAL, Unrealized (Losses) |  | (419)
AMORTIZED COST [Abstract] |  |
Amortized cost | 444,807 | 259,627
FAIR VALUE [Abstract] |  |
Total held to maturity securities | 457,336 | 261,330
Mortgage-backed Securities [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 139,138 | 66,577
Gross unrealized gains | 620 | 0
Gross unrealized (losses) | 0 | (473)
Fair value | 139,758 | 66,104
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 5,509
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (43)
OVER 12 MONTHS, Fair Value |  | 60,595
OVER 12 MONTHS, Unrealized (Losses) |  | (430)
TOTAL, Fair Value |  | 66,104
TOTAL, Unrealized (Losses) |  | (473)
AMORTIZED COST [Abstract] |  |
Amortized cost | 139,138 | 66,577
FAIR VALUE [Abstract] |  |
Total held to maturity securities | 139,758 | 66,104
Obligations of States and Political Subdivisions [Member] |  |
Held-to-maturity Securities [Abstract] |  |
Amortized cost | 20,644 | 19,540
Gross unrealized gains | 434 | 60
Gross unrealized (losses) | (22) | (187)
Fair value | 21,056 | 19,413
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 5,528
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (34)
OVER 12 MONTHS, Fair Value | 2,266 | 7,964
OVER 12 MONTHS, Unrealized (Losses) | (22) | (153)
TOTAL, Fair Value | 2,266 | 13,492
TOTAL, Unrealized (Losses) | (22) | (187)
AMORTIZED COST [Abstract] |  |
Amortized cost | 20,644 | 19,540
FAIR VALUE [Abstract] |  |
Total held to maturity securities | $ 21,056 | $ 19,413

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