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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Sep. 30, 2016
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Available-for-sale debt securities [Abstract] |  |
Fair value | $ 666,424 | $ 558,940
Available-for-sale equity securities [Abstract] |  |
Fair value | 1,141,684 | 910,309
Available-for-sale securities [Abstract] |  |
Amortized cost | 1,797,966 | 1,435,272
Gross unrealized gains | 19,811 | 37,257
Gross unrealized (losses) | (9,669) | (3,280)
Total available for sale securities | 1,808,108 | 1,469,249
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 846,172 | 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) | (8,936) | (1,033)
OVER 12 MONTHS, Fair Value | 32,236 | 52,770
OVER 12 MONTHS, Unrealized (Losses) | (733) | (2,247)
TOTAL, Fair Value | 878,408 | 204,719
TOTAL, Unrealized (Losses) | (9,669) | (3,280)
AMORTIZED COST |  |
Due in one year or less | 0 | 0
Due after one year through five years | 27,310 | 17,370
Due after five years through ten years | 393,509 | 426,034
Due after ten years | 703,553 | 436,077
Total | 1,124,372 | 879,481
Mortgage-backed securities | 672,554 | 555,036
Common equities and mutual funds | 1,040 | 755
Amortized cost | 1,797,966 | 1,435,272
FAIR VALUE |  |
Due in one year or less | 0 | 0
Due after one year through five years | 28,136 | 17,897
Due after five years through ten years | 404,534 | 446,771
Due after ten years | 707,569 | 444,516
Total | 1,140,239 | 909,184
Mortgage-backed securities | 666,424 | 558,940
Common equities and mutual funds | 1,445 | 1,125
Total available for sale securities | 1,808,108 | 1,469,249
Trust Preferred Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost |  | 14,935
Gross unrealized gains |  | 0
Gross unrealized (losses) |  | (1,957)
Fair value |  | 12,978
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 0
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0
OVER 12 MONTHS, Fair Value |  | 12,978
OVER 12 MONTHS, Unrealized (Losses) |  | (1,957)
TOTAL, Fair Value |  | 12,978
TOTAL, Unrealized (Losses) |  | (1,957)
Small Business Administration Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 100,968 | 78,431
Gross unrealized gains | 1,093 | 2,288
Gross unrealized (losses) | (1) | 0
Fair value | 102,060 | 80,719
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 3,955 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 3,955 |
TOTAL, Unrealized (Losses) | (1) |
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 905,504 | 668,628
Gross unrealized gains | 15,546 | 30,141
Gross unrealized (losses) | (3,175) | (97)
Fair value | 917,875 | 698,672
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 335,226 | 8,481
LESS THAN 12 MONTHS, Unrealized (Losses) | (3,175) | (58)
OVER 12 MONTHS, Fair Value | 0 | 2,688
OVER 12 MONTHS, Unrealized (Losses) | 0 | (39)
TOTAL, Fair Value | 335,226 | 11,169
TOTAL, Unrealized (Losses) | (3,175) | (97)
Asset-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 117,900 | 117,487
Gross unrealized gains | 2,404 | 73
Gross unrealized (losses) | 0 | (745)
Fair value | 120,304 | 116,815
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 89,403
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (745)
OVER 12 MONTHS, Fair Value |  | 0
OVER 12 MONTHS, Unrealized (Losses) |  | 0
TOTAL, Fair Value |  | 89,403
TOTAL, Unrealized (Losses) |  | (745)
Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 672,554 | 555,036
Gross unrealized gains | 359 | 4,382
Gross unrealized (losses) | (6,489) | (478)
Fair value | 666,424 | 558,940
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 506,991 | 54,065
LESS THAN 12 MONTHS, Unrealized (Losses) | (5,760) | (230)
OVER 12 MONTHS, Fair Value | 31,857 | 36,979
OVER 12 MONTHS, Unrealized (Losses) | (729) | (248)
TOTAL, Fair Value | 538,848 | 91,044
TOTAL, Unrealized (Losses) | (6,489) | (478)
Debt Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,796,926 | 1,434,517
Gross unrealized gains | 19,402 | 36,884
Gross unrealized (losses) | (9,665) | (3,277)
Fair value | 1,806,663 | 1,468,124
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 846,172 | 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) | (8,936) | (1,033)
OVER 12 MONTHS, Fair Value | 31,857 | 52,645
OVER 12 MONTHS, Unrealized (Losses) | (729) | (2,244)
TOTAL, Fair Value | 878,029 | 204,594
TOTAL, Unrealized (Losses) | (9,665) | (3,277)
Common Equities and Mutual Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 1,040 | 755
Gross unrealized gains | 409 | 373
Gross unrealized (losses) | (4) | (3)
Fair value | 1,445 | 1,125
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 0
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | 0
OVER 12 MONTHS, Fair Value | 379 | 125
OVER 12 MONTHS, Unrealized (Losses) | (4) | (3)
TOTAL, Fair Value | 379 | 125
TOTAL, Unrealized (Losses) | $ (4) | $ (3)

X
- Definition Amount of available-for-sale equity securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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