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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Available-for-sale debt securities [Abstract] |  |
Mortgage-backed securities available for sale | $ 654,890 | $ 586,454
Available-for-sale equity securities [Abstract] |  |
Investment securities available for sale | 1,418,862 | 1,106,977
Available-for-sale securities [Abstract] |  |
Amortized cost | 2,102,111 | 1,680,307
Gross unrealized gains | 7,126 | 19,884
Gross unrealized (losses) | (35,485) | (6,760)
Total available for sale securities | 2,073,752 | 1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,246,483 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (24,190) | (4,512)
OVER 12 MONTHS, Fair Value | 296,288 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (11,295) | (2,248)
TOTAL, Fair Value | 1,542,771 | 624,937
TOTAL, Unrealized (Losses) | (35,485) | (6,760)
AMORTIZED COST |  |
Due in one year or less | 100 | 0
Due after one year through five years | 47,402 | 36,586
Due after five years through ten years | 436,528 | 347,831
Due after ten years | 945,085 | 705,963
Total | 1,429,115 | 1,090,380
Mortgage-backed securities | 671,649 | 588,918
Common equities and mutual funds | 1,347 | 1,009
Amortized cost | 2,102,111 | 1,680,307
FAIR VALUE |  |
Due in one year or less | 100 | 0
Due after one year through five years | 47,956 | 37,674
Due after five years through ten years | 438,149 | 358,198
Due after ten years | 930,806 | 709,660
Total | 1,417,011 | 1,105,532
Mortgage-backed securities | 654,890 | 586,454
Common equities and mutual funds | 1,851 | 1,445
Total available for sale securities | 2,073,752 | 1,693,431
Small Business Administration Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 52,313 | 57,046
Gross unrealized gains | 50 | 825
Gross unrealized (losses) | (266) | 0
Mortgage-backed securities available for sale | 52,097 | 57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 42,418 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (266) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 42,418 |
TOTAL, Unrealized (Losses) | (266) |
Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 14,508 |
Gross unrealized gains | 62 |
Gross unrealized (losses) | (173) |
Mortgage-backed securities available for sale | 14,397 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 8,469 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (173) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 8,469 |
TOTAL, Unrealized (Losses) | (173) |
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,219,989 | 938,883
Gross unrealized gains | 4,502 | 14,983
Gross unrealized (losses) | (18,125) | (3,037)
Mortgage-backed securities available for sale | 1,206,366 | 950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 770,431 | 280,900
LESS THAN 12 MONTHS, Unrealized (Losses) | (17,356) | (2,887)
OVER 12 MONTHS, Fair Value | 15,650 | 5,853
OVER 12 MONTHS, Unrealized (Losses) | (769) | (150)
TOTAL, Fair Value | 786,081 | 286,753
TOTAL, Unrealized (Losses) | (18,125) | (3,037)
Asset-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 142,305 | 94,451
Gross unrealized gains | 2,007 | 2,381
Gross unrealized (losses) | (161) | 0
Mortgage-backed securities available for sale | 144,151 | 96,832
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 49,063 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (161) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 49,063 |
TOTAL, Unrealized (Losses) | (161) |
Mortgage-backed Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 671,649 | 588,918
Gross unrealized gains | 0 | 1,259
Gross unrealized (losses) | (16,759) | (3,723)
Mortgage-backed securities available for sale | 654,890 | 586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 374,252 | 237,897
LESS THAN 12 MONTHS, Unrealized (Losses) | (6,233) | (1,625)
OVER 12 MONTHS, Fair Value | 280,638 | 100,287
OVER 12 MONTHS, Unrealized (Losses) | (10,526) | (2,098)
TOTAL, Fair Value | 654,890 | 338,184
TOTAL, Unrealized (Losses) | (16,759) | (3,723)
Debt Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 2,100,764 | 1,679,298
Gross unrealized gains | 6,621 | 19,448
Gross unrealized (losses) | (35,484) | (6,760)
Mortgage-backed securities available for sale | 2,071,901 | 1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,244,633 | 518,797
LESS THAN 12 MONTHS, Unrealized (Losses) | (24,189) | (4,512)
OVER 12 MONTHS, Fair Value | 296,288 | 106,140
OVER 12 MONTHS, Unrealized (Losses) | (11,295) | (2,248)
TOTAL, Fair Value | 1,540,921 | 624,937
TOTAL, Unrealized (Losses) | (35,484) | (6,760)
Common Equities and Mutual Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Amortized cost | 1,347 | 1,009
Gross unrealized gains | 505 | 436
Gross unrealized (losses) | (1) | 0
Investment securities available for sale | 1,851 | $ 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,850 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1) |
OVER 12 MONTHS, Fair Value | 0 |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Fair Value | 1,850 |
TOTAL, Unrealized (Losses) | $ (1) |

X
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