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SECURITIES - Schedule of Securities Available (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Available For Sale |  |
Mortgage-back securities | $ 364,065 | $ 586,454
Available-for-sale securities [Abstract] |  |
Amortized cost | 1,895,802 | 1,680,307
Gross unrealized gains | 4,096 | 19,884
Gross unrealized (losses) | (47,873) | (6,760)
Total securities | 1,852,025 | 1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 950,499 | 518,797
OVER 12 MONTHS, Fair Value | 601,825 | 106,140
TOTAL, Fair Value | 1,552,324 | 624,937
LESS THAN 12 MONTHS, Unrealized (Losses) | (18,629) | (4,512)
OVER 12 MONTHS, Unrealized (Losses) | (29,244) | (2,248)
TOTAL, Unrealized (Losses) | (47,873) | (6,760)
AMORTIZED COST [Abstract] |  |
Due in one year or less | 2,532 | 0
Due after one year through five years | 41,415 | 36,586
Due after five years through ten years | 352,099 | 347,831
Due after ten years | 1,118,283 | 705,963
Total Amortized Cost | 1,514,329 | 1,090,380
Mortgage-backed securities | 378,301 | 588,918
Common equities and mutual funds | 3,172 | 1,009
Amortized cost | 1,895,802 | 1,680,307
FAIR VALUE [Abstract] |  |
Due in one year or less | 2,529 | 0
Due after one year through five years | 41,504 | 37,674
Due after five years through ten years | 350,143 | 358,198
Due after ten years | 1,089,984 | 709,660
Total Fair Value | 1,484,160 | 1,105,532
Mortgage-back securities | 364,065 | 586,454
Common equities and mutual funds | 3,800 | 1,445
Total securities | 1,852,025 | 1,693,431
Held To Maturity |  |
Amortized cost | 172,154 | 563,529
Gross unrealized gains |  | 4,901
Gross unrealized (losses) | (11,180) | (4,245)
Fair value | 160,974 | 564,185
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 6,178 | 315,838
OVER 12 MONTHS, Fair Value | 154,796 | 10,295
TOTAL, Fair Value | 160,974 | 326,133
LESS THAN 12 MONTHS, Unrealized (Losses) | (287) | (4,022)
OVER 12 MONTHS, Unrealized (Losses) | (10,893) | (223)
TOTAL, Unrealized (Losses) | (11,180) | (4,245)
AMORTIZED COST [Abstract] |  |
Due in one year or less |  | 1,483
Due after one year through five years |  | 17,926
Due after five years through ten years |  | 144,996
Due after ten years | 164,304 | 285,435
Total Amortized Cost | 164,304 | 449,840
Mortgage-backed securities | 7,850 | 113,689
Amortized cost | 172,154 | 563,529
FAIR VALUE [Abstract] |  |
Due in one year or less |  | 1,480
Due after one year through five years |  | 18,160
Due after five years through ten years |  | 147,832
Due after ten years | 153,546 | 284,257
Total Fair Value | 153,546 | 451,729
Mortgage-backed securities | 7,428 | 112,456
Total securities | 160,974 | 564,185
Small Business Administration Securities [Member] |  |
Available For Sale |  |
Amortized cost | 45,591 | 57,046
Gross unrealized gains | 1 | 825
Gross unrealized (losses) | (1,255) | 0
Mortgage-back securities | 44,337 | 57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 43,097 |
OVER 12 MONTHS, Fair Value | 0 |
TOTAL, Fair Value | 43,097 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,255) |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Unrealized (Losses) | (1,255) |
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 44,337 | 57,871
US States and Political Subdivisions Debt Securities [Member] |  |
Available For Sale |  |
Amortized cost | 17,154 |
Gross unrealized gains | 49 |
Gross unrealized (losses) | (293) |
Mortgage-back securities | 16,910 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 11,036 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (279) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 881 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (14) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 11,917 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (293) |
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 16,910 |
Held To Maturity |  |
Amortized cost |  | 19,247
Gross unrealized gains |  | 157
Gross unrealized (losses) |  | (36)
Fair value |  | 19,368
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 1,364
OVER 12 MONTHS, Fair Value |  | 4,089
TOTAL, Fair Value |  | 5,453
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (6)
OVER 12 MONTHS, Unrealized (Losses) |  | (30)
TOTAL, Unrealized (Losses) |  | (36)
AMORTIZED COST [Abstract] |  |
Amortized cost |  | 19,247
FAIR VALUE [Abstract] |  |
Total securities |  | 19,368
Non-Bank Qualified Obligation of States And Political Subdivisions [Member] |  |
Available For Sale |  |
Amortized cost | 1,140,884 | 938,883
Gross unrealized gains | 826 | 14,983
Gross unrealized (losses) | (31,825) | (3,037)
Mortgage-back securities | 1,109,885 | 950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 626,693 | 280,900
OVER 12 MONTHS, Fair Value | 358,095 | 5,853
TOTAL, Fair Value | 984,788 | 286,753
LESS THAN 12 MONTHS, Unrealized (Losses) | (13,539) | (2,887)
OVER 12 MONTHS, Unrealized (Losses) | (18,286) | (150)
TOTAL, Unrealized (Losses) | (31,825) | (3,037)
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 1,109,885 | 950,829
Held To Maturity |  |
Amortized cost | 164,304 | 430,593
Gross unrealized gains | 0 | 4,744
Gross unrealized (losses) | (10,758) | (2,976)
Fair value | 153,546 | 432,361
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 6,178 | 202,018
OVER 12 MONTHS, Fair Value | 147,368 | 6,206
TOTAL, Fair Value | 153,546 | 208,224
LESS THAN 12 MONTHS, Unrealized (Losses) | (287) | (2,783)
OVER 12 MONTHS, Unrealized (Losses) | (10,471) | (193)
TOTAL, Unrealized (Losses) | (10,758) | (2,976)
AMORTIZED COST [Abstract] |  |
Amortized cost | 164,304 | 430,593
FAIR VALUE [Abstract] |  |
Total securities | 153,546 | 432,361
Asset-backed Securities [Member] |  |
Available For Sale |  |
Amortized cost | 310,700 | 94,451
Gross unrealized gains | 2,585 | 2,381
Gross unrealized (losses) | (257) | 0
Mortgage-back securities | 313,028 | 96,832
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 146,638 |
OVER 12 MONTHS, Fair Value | 0 |
TOTAL, Fair Value | 146,638 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (257) |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Unrealized (Losses) | (257) |
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 313,028 | 96,832
Collateralized Mortgage Backed Securities [Member] |  |
Available For Sale |  |
Amortized cost | 378,301 | 588,918
Gross unrealized gains | 0 | 1,259
Gross unrealized (losses) | (14,236) | (3,723)
Mortgage-back securities | 364,065 | 586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 121,217 | 237,897
OVER 12 MONTHS, Fair Value | 242,849 | 100,287
TOTAL, Fair Value | 364,066 | 338,184
LESS THAN 12 MONTHS, Unrealized (Losses) | (3,292) | (1,625)
OVER 12 MONTHS, Unrealized (Losses) | (10,944) | (2,098)
TOTAL, Unrealized (Losses) | (14,236) | (3,723)
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 364,065 | 586,454
Held To Maturity |  |
Amortized cost | 7,850 | 113,689
Gross unrealized gains | 0 | 0
Gross unrealized (losses) | (422) | (1,233)
Fair value | 7,428 | 112,456
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 112,456
OVER 12 MONTHS, Fair Value | 7,428 | 0
TOTAL, Fair Value | 7,428 | 112,456
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (1,233)
OVER 12 MONTHS, Unrealized (Losses) | (422) | 0
TOTAL, Unrealized (Losses) | (422) | (1,233)
AMORTIZED COST [Abstract] |  |
Amortized cost | 7,850 | 113,689
FAIR VALUE [Abstract] |  |
Total securities | 7,428 | 112,456
Debt Securities [Member] |  |
Available For Sale |  |
Amortized cost | 1,892,630 | 1,679,298
Gross unrealized gains | 3,461 | 19,448
Gross unrealized (losses) | (47,866) | (6,760)
Mortgage-back securities | 1,848,225 | 1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 948,681 |
OVER 12 MONTHS, Fair Value | 601,825 |
TOTAL, Fair Value | 1,550,506 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (18,622) |
OVER 12 MONTHS, Unrealized (Losses) | (29,244) |
TOTAL, Unrealized (Losses) | (47,866) |
FAIR VALUE [Abstract] |  |
Mortgage-back securities | 1,848,225 | 1,691,986
Common Equities And Mutual Funds [Member] |  |
Available For Sale |  |
Amortized cost | 3,172 | 1,009
Gross unrealized gains | 635 | 436
Gross unrealized (losses) | (7) | 0
Mortgage-back securities | 3,800 | 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 1,818 |
OVER 12 MONTHS, Fair Value | 0 |
TOTAL, Fair Value | 1,818 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (7) |
OVER 12 MONTHS, Unrealized (Losses) | 0 |
TOTAL, Unrealized (Losses) | (7) |
FAIR VALUE [Abstract] |  |
Mortgage-back securities | $ 3,800 | $ 1,445

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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