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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Available-for-sale debt securities [Abstract] |  |
Mortgage-backed securities available for sale | $ 600,112 | $ 586,454
Available-for-sale equity securities [Abstract] |  |
Investment securities available for sale | 1,392,240 | 1,106,977
Available-for-sale securities [Abstract] |  |
Amortized cost | 1,984,898 | 1,680,307
Gross unrealized gains | 19,618 | 19,884
Gross unrealized (losses) | (12,164) | (6,760)
Total available for sale securities | 1,992,352 | 1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 807,502 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (6,250) | (4,512)
OVER 12 MONTHS, Fair Value | 312,297 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (5,914) | (2,248)
TOTAL, Fair Value | 1,119,799 | 624,937
TOTAL, Unrealized (Losses) | (12,164) | (6,760)
AMORTIZED COST |  |
Due in one year or less | 100 | 0
Due after one year through five years | 55,485 | 36,586
Due after five years through ten years | 452,422 | 347,831
Due after ten years | 869,255 | 705,963
Total | 1,377,262 | 1,090,380
Mortgage-backed securities | 606,338 | 588,918
Common equities and mutual funds | 1,298 | 1,009
Amortized cost | 1,984,898 | 1,680,307
FAIR VALUE |  |
Due in one year or less | 100 | 0
Due after one year through five years | 56,375 | 37,674
Due after five years through ten years | 462,903 | 358,198
Due after ten years | 871,033 | 709,660
Total | 1,390,411 | 1,105,532
Mortgage-backed securities | 600,112 | 586,454
Common equities and mutual funds | 1,829 | 1,445
Total available for sale securities | 1,992,352 | 1,693,431
Small Business Administration Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 56,602 | 57,046
Gross unrealized gains | 349 | 825
Gross unrealized (losses) | (3) | 0
Mortgage-backed securities available for sale | 56,948 | 57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 14,236 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (3) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 14,236 |
TOTAL, Unrealized (Losses) | (3) |
Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 14,513 |
Gross unrealized gains | 123 |
Gross unrealized (losses) | (26) |
Mortgage-backed securities available for sale | 14,610 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 3,139 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (26) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 3,139 |
TOTAL, Unrealized (Losses) | (26) |
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,212,661 | 938,883
Gross unrealized gains | 16,079 | 14,983
Gross unrealized (losses) | (5,710) | (3,037)
Mortgage-backed securities available for sale | 1,223,030 | 950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 553,626 | 280,900
LESS THAN 12 MONTHS, Unrealized (Losses) | (4,945) | (2,887)
OVER 12 MONTHS, Fair Value | 16,045 | 5,853
OVER 12 MONTHS, Unrealized (Losses) | (765) | (150)
TOTAL, Fair Value | 569,671 | 286,753
TOTAL, Unrealized (Losses) | (5,710) | (3,037)
Asset-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 93,486 | 94,451
Gross unrealized gains | 2,337 | 2,381
Gross unrealized (losses) | 0 | 0
Mortgage-backed securities available for sale | 95,823 | 96,832
Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 606,338 | 588,918
Gross unrealized gains | 198 | 1,259
Gross unrealized (losses) | (6,424) | (3,723)
Mortgage-backed securities available for sale | 600,112 | 586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 234,672 | 237,897
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,275) | (1,625)
OVER 12 MONTHS, Fair Value | 296,252 | 100,287
OVER 12 MONTHS, Unrealized (Losses) | (5,149) | (2,098)
TOTAL, Fair Value | 530,924 | 338,184
TOTAL, Unrealized (Losses) | (6,424) | (3,723)
Debt Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,983,600 | 1,679,298
Gross unrealized gains | 19,086 | 19,448
Gross unrealized (losses) | (12,163) | (6,760)
Mortgage-backed securities available for sale | 1,990,523 | 1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 805,673 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (6,249) | (4,512)
OVER 12 MONTHS, Fair Value | 312,297 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (5,914) | (2,248)
TOTAL, Fair Value | 1,117,970 | 624,937
TOTAL, Unrealized (Losses) | (12,163) | (6,760)
Common Equities and Mutual Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 1,298 | 1,009
Gross unrealized gains | 532 | 436
Gross unrealized (losses) | (1) | 0
Investment securities available for sale | 1,829 | $ 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,829 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 1,829 |
TOTAL, Unrealized (Losses) | $ (1) |

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