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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
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Available-for-sale debt securities [Abstract] |  |
Fair Value | $ 413,493 | $ 364,065
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value |  | 950,499
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (18,629)
OVER 12 MONTHS, Fair Value |  | 601,825
OVER 12 MONTHS, Unrealized (Losses) |  | (29,244)
TOTAL, Fair Value |  | 1,552,324
TOTAL, Unrealized (Losses) |  | (47,873)
AMORTIZED COST |  |
Due in one year or less | 1,020 | 2,532
Due after one year through five years | 15,058 | 41,415
Due after five years through ten years | 64,894 | 352,099
Due after ten years | 1,008,514 | 1,118,283
Total | 1,089,486 | 1,514,329
Mortgage-backed securities | 419,024 | 378,301
Common equities and mutual funds |  | 3,172
Amortized cost | 1,508,510 | 1,895,802
FAIR VALUE |  |
Due in one year or less | 1,019 | 2,529
Due after one year through five years | 15,285 | 41,504
Due after five years through ten years | 65,335 | 350,143
Due after ten years | 1,000,024 | 1,089,984
Total | 1,081,663 | 1,484,160
Mortgage-backed securities | 413,493 | 364,065
Common equities and mutual funds(1) |  | 3,800
Total available for sale securities | 1,495,156 | 1,852,025
Available-for-sale Securities [Member] |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost |  | 1,895,802
Gross unrealized gains |  | 4,096
Gross unrealized (losses) |  | (47,873)
Fair Value |  | 1,852,025
Small Business Administration Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 163,621 | 45,591
Gross unrealized gains | 637 | 1
Gross unrealized (losses) | (155) | (1,255)
Fair Value | 164,103 | 44,337
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 41,845 | 43,097
LESS THAN 12 MONTHS, Unrealized (Losses) | (29) | (1,255)
OVER 12 MONTHS, Fair Value | 27,214 | 0
OVER 12 MONTHS, Unrealized (Losses) | (126) | 0
TOTAL, Fair Value | 69,059 | 43,097
TOTAL, Unrealized (Losses) | (155) | (1,255)
Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 11,432 | 17,154
Gross unrealized gains | 106 | 49
Gross unrealized (losses) | (9) | (293)
Fair Value | 11,529 | 16,910
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 11,036
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (279)
OVER 12 MONTHS, Fair Value | 2,052 | 881
OVER 12 MONTHS, Unrealized (Losses) | (9) | (14)
TOTAL, Fair Value | 2,052 | 11,917
TOTAL, Unrealized (Losses) | (9) | (293)
Non-bank Qualified Obligations of States and Political Subdivisions |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 629,732 | 1,140,884
Gross unrealized gains | 1,357 | 826
Gross unrealized (losses) | (9,447) | (31,825)
Fair Value | 621,642 | 1,109,885
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 10,210 | 626,693
LESS THAN 12 MONTHS, Unrealized (Losses) | (2) | (13,539)
OVER 12 MONTHS, Fair Value | 448,680 | 358,095
OVER 12 MONTHS, Unrealized (Losses) | (9,445) | (18,286)
TOTAL, Fair Value | 458,890 | 984,788
TOTAL, Unrealized (Losses) | (9,447) | (31,825)
Asset-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 284,701 | 310,700
Gross unrealized gains | 1,286 | 2,585
Gross unrealized (losses) | (1,598) | (257)
Fair Value | 284,389 | 313,028
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 148,254 | 146,638
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,539) | (257)
OVER 12 MONTHS, Fair Value | 12,184 | 0
OVER 12 MONTHS, Unrealized (Losses) | (59) | 0
TOTAL, Fair Value | 160,438 | 146,638
TOTAL, Unrealized (Losses) | (1,598) | (257)
Mortgage-backed Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 419,024 | 378,301
Gross unrealized gains | 1,064 | 0
Gross unrealized (losses) | (6,595) | (14,236)
Fair Value | 413,493 | 364,065
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 32,722 | 121,217
LESS THAN 12 MONTHS, Unrealized (Losses) | (13) | (3,292)
OVER 12 MONTHS, Fair Value | 282,789 | 242,849
OVER 12 MONTHS, Unrealized (Losses) | (6,582) | (10,944)
TOTAL, Fair Value | 315,511 | 364,066
TOTAL, Unrealized (Losses) | (6,595) | (14,236)
Debt Securities |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 1,508,510 | 1,892,630
Gross unrealized gains | 4,450 | 3,461
Gross unrealized (losses) | (17,804) | (47,866)
Fair Value | 1,495,156 | 1,848,225
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 233,031 | 948,681
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,583) | (18,622)
OVER 12 MONTHS, Fair Value | 772,919 | 601,825
OVER 12 MONTHS, Unrealized (Losses) | (16,221) | (29,244)
TOTAL, Fair Value | 1,005,950 | 1,550,506
TOTAL, Unrealized (Losses) | (17,804) | (47,866)
Common Equities and Mutual Funds |  |
Available-for-sale debt securities [Abstract] |  |
Amortized cost | 3,592 | 3,172
Gross unrealized gains | 619 | 635
Gross unrealized (losses) | 0 | (7)
Fair Value | 4,211 | 3,800
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 1,818
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | (7)
OVER 12 MONTHS, Fair Value | 0 | 0
OVER 12 MONTHS, Unrealized (Losses) | 0 | 0
TOTAL, Fair Value | 0 | 1,818
TOTAL, Unrealized (Losses) | $ 0 | $ (7)

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- 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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