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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
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Available-for-sale debt securities [Abstract] |  |
Mortgage-backed securities available for sale | $ 575,999 | $ 586,454
Available-for-sale equity securities [Abstract] |  |
Investment securities available for sale | 1,351,538 | 1,106,977
Available-for-sale securities [Abstract] |  |
Amortized cost | 1,965,768 | 1,680,307
Gross unrealized gains | 5,015 | 19,884
Gross unrealized (losses) | (43,246) | (6,760)
Total available for sale securities | 1,927,537 | 1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,257,747 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (30,682) | (4,512)
OVER 12 MONTHS, Fair Value | 290,231 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (12,564) | (2,248)
TOTAL, Fair Value | 1,547,978 | 624,937
TOTAL, Unrealized (Losses) | (43,246) | (6,760)
AMORTIZED COST |  |
Due in one year or less | 100 | 0
Due after one year through five years | 29,352 | 36,586
Due after five years through ten years | 348,304 | 347,831
Due after ten years | 993,211 | 705,963
Total | 1,370,967 | 1,090,380
Mortgage-backed securities | 593,454 | 588,918
Common equities and mutual funds | 1,347 | 1,009
Amortized cost | 1,965,768 | 1,680,307
FAIR VALUE |  |
Due in one year or less | 100 | 0
Due after one year through five years | 29,688 | 37,674
Due after five years through ten years | 348,680 | 358,198
Due after ten years | 971,174 | 709,660
Total | 1,349,642 | 1,105,532
Mortgage-backed securities | 575,999 | 586,454
Common equities and mutual funds | 1,896 | 1,445
Total available for sale securities | 1,927,537 | 1,693,431
Small Business Administration Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 51,785 | 57,046
Gross unrealized gains | 27 | 825
Gross unrealized (losses) | (853) | 0
Mortgage-backed securities available for sale | 50,959 | 57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 47,646 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (853) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 47,646 |
TOTAL, Unrealized (Losses) | (853) |
Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 14,472 |
Gross unrealized gains | 60 |
Gross unrealized (losses) | (162) |
Mortgage-backed securities available for sale | 14,370 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 8,443 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (162) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 8,443 |
TOTAL, Unrealized (Losses) | (162) |
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,105,310 | 938,883
Gross unrealized gains | 2,594 | 14,983
Gross unrealized (losses) | (24,430) | (3,037)
Mortgage-backed securities available for sale | 1,083,474 | 950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 786,022 | 280,900
LESS THAN 12 MONTHS, Unrealized (Losses) | (23,032) | (2,887)
OVER 12 MONTHS, Fair Value | 25,062 | 5,853
OVER 12 MONTHS, Unrealized (Losses) | (1,398) | (150)
TOTAL, Fair Value | 811,084 | 286,753
TOTAL, Unrealized (Losses) | (24,430) | (3,037)
Asset-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 199,400 | 94,451
Gross unrealized gains | 1,784 | 2,381
Gross unrealized (losses) | (345) | 0
Mortgage-backed securities available for sale | 200,839 | 96,832
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 107,027 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (345) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 107,027 |
TOTAL, Unrealized (Losses) | (345) |
Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 593,454 | 588,918
Gross unrealized gains | 0 | 1,259
Gross unrealized (losses) | (17,455) | (3,723)
Mortgage-backed securities available for sale | 575,999 | 586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 306,713 | 237,897
LESS THAN 12 MONTHS, Unrealized (Losses) | (6,289) | (1,625)
OVER 12 MONTHS, Fair Value | 265,169 | 100,287
OVER 12 MONTHS, Unrealized (Losses) | (11,166) | (2,098)
TOTAL, Fair Value | 571,882 | 338,184
TOTAL, Unrealized (Losses) | (17,455) | (3,723)
Debt Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,964,421 | 1,679,298
Gross unrealized gains | 4,465 | 19,448
Gross unrealized (losses) | (43,245) | (6,760)
Mortgage-backed securities available for sale | 1,925,641 | 1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,255,851 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (30,681) | (4,512)
OVER 12 MONTHS, Fair Value | 290,231 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (12,564) | (2,248)
TOTAL, Fair Value | 1,546,082 | 624,937
TOTAL, Unrealized (Losses) | (43,245) | (6,760)
Common Equities and Mutual Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized Cost | 1,347 | 1,009
Gross unrealized gains | 550 | 436
Gross unrealized (losses) | (1) | 0
Investment securities available for sale | 1,896 | $ 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,896 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 1,896 |
TOTAL, Unrealized (Losses) | $ (1) |

X
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