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SECURITIES, Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
--- | --- | ---
Available-for-sale debt securities [Abstract] |  |  |
Fair value |  | $ 688,952 | $ 576,583
Available-for-sale equity securities [Abstract] |  |  |
Fair value |  | 866,152 | 679,504
Available-for-sale securities [Abstract] |  |  |
Amortized cost |  | 1,534,712 | 1,254,661
Gross unrealized gains |  | 27,271 | 10,377
Gross unrealized (losses) |  | (6,879) | (8,951)
Fair value |  | 1,555,104 | 1,256,087
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 376,193 | 545,994
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (2,507) | (5,161)
OVER 12 MONTHS, Fair Value |  | 172,096 | 103,450
OVER 12 MONTHS, Unrealized (Losses) |  | (4,372) | (3,790)
TOTAL, Fair Value |  | 548,289 | 649,444
TOTAL, Unrealized (Losses) |  | (6,879) | (8,951)
AMORTIZED COST [Abstract] |  |  |
Due in one year or less |  | 0 | 0
Due after one year through five years |  | 7,337 | 1,174
Due after five years through ten years |  | 416,311 | 370,087
Due after ten years |  | 420,255 | 302,596
Total |  | 843,903 | 673,857
Mortgage-backed securities |  | 690,049 | 580,165
Common equities and mutual funds |  | 760 | 639
Amortized cost |  | 1,534,712 | 1,254,661
FAIR VALUE [Abstract] |  |  |
Due in one year or less |  | 0 | 0
Due after one year through five years |  | 7,533 | 1,207
Due after five years through ten years |  | 431,338 | 376,394
Due after ten years |  | 426,175 | 300,989
Total |  | 865,046 | 678,590
Mortgage-backed securities |  | 688,952 | 576,583
Common equities and mutual funds |  | 1,106 | 914
Total available for sale securities |  | 1,555,104 | 1,256,087
Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | [1] | 14,933 | 14,930
Unrealized gain (loss) | [1] | (2,985) | (2,263)
Fair value | [1] | 11,948 | 12,667
AMORTIZED COST [Abstract] |  |  |
Amortized cost | [1] | 14,933 | 14,930
FAIR VALUE [Abstract] |  |  |
Total available for sale securities | [1] | 11,948 | 12,667
Moody Credit Rating, Baa2 [Member] | Key Corp Capital I [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | [1] | 4,987 | 4,986
Unrealized gain (loss) | [1] | (981) | (797)
Fair value | [1] | 4,006 | 4,189
AMORTIZED COST [Abstract] |  |  |
Amortized cost | [1] | 4,987 | 4,986
FAIR VALUE [Abstract] |  |  |
Total available for sale securities | [1] | 4,006 | 4,189
Moody Credit Rating, Baa2 [Member] | Huntington Capital Trust II SE [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | [1] | 4,980 | 4,979
Unrealized gain (loss) | [1] | (1,102) | (903)
Fair value | [1] | 3,878 | 4,076
AMORTIZED COST [Abstract] |  |  |
Amortized cost | [1] | 4,980 | 4,979
FAIR VALUE [Abstract] |  |  |
Total available for sale securities | [1] | 3,878 | 4,076
Moody Credit Rating, Baa1 [Member] | PNC Capital Trust [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | [1] | 4,966 | 4,965
Unrealized gain (loss) | [1] | (902) | (563)
Fair value | [1] | 4,064 | 4,402
AMORTIZED COST [Abstract] |  |  |
Amortized cost | [1] | 4,966 | 4,965
FAIR VALUE [Abstract] |  |  |
Total available for sale securities | [1] | 4,064 | 4,402
Debt Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 1,533,952 | 1,254,022
Gross unrealized gains |  | 26,919 | 10,094
Gross unrealized (losses) |  | (6,873) | (8,943)
Fair value |  | 1,553,998 | 1,255,173
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 376,193 | 545,994
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (2,507) | (5,161)
OVER 12 MONTHS, Fair Value |  | 171,974 | 103,329
OVER 12 MONTHS, Unrealized (Losses) |  | (4,366) | (3,782)
TOTAL, Fair Value |  | 548,167 | 649,323
TOTAL, Unrealized (Losses) |  | (6,873) | (8,943)
Trust Preferred and Corporate Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 14,933 | 16,199
Gross unrealized gains |  | 0 | 8
Gross unrealized (losses) |  | (2,985) | (2,263)
Fair value |  | 11,948 | 13,944
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 0 | 0
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0 | 0
OVER 12 MONTHS, Fair Value |  | 11,948 | 12,667
OVER 12 MONTHS, Unrealized (Losses) |  | (2,985) | (2,263)
TOTAL, Fair Value |  | 11,948 | 12,667
TOTAL, Unrealized (Losses) |  | (2,985) | (2,263)
Small Business Administration Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 81,823 | 54,493
Gross unrealized gains |  | 1,874 | 1,563
Gross unrealized (losses) |  | 0 | 0
Fair value |  | 83,697 | 56,056
Non-bank Qualified Obligations of States and Political Subdivisions [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 680,360 | 603,165
Gross unrealized gains |  | 23,273 | 7,240
Gross unrealized (losses) |  | (398) | (1,815)
Fair value |  | 703,235 | 608,590
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 22,208 | 97,006
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (52) | (860)
OVER 12 MONTHS, Fair Value |  | 15,479 | 42,583
OVER 12 MONTHS, Unrealized (Losses) |  | (346) | (955)
TOTAL, Fair Value |  | 37,687 | 139,589
TOTAL, Unrealized (Losses) |  | (398) | (1,815)
Mortgage-backed Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 690,049 | 580,165
Gross unrealized gains |  | 1,759 | 1,283
Gross unrealized (losses) |  | (2,856) | (4,865)
Fair value |  | 688,952 | 576,583
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 303,869 | 448,988
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (1,821) | (4,301)
OVER 12 MONTHS, Fair Value |  | 144,547 | 48,079
OVER 12 MONTHS, Unrealized (Losses) |  | (1,035) | (564)
TOTAL, Fair Value |  | 448,416 | 497,067
TOTAL, Unrealized (Losses) |  | (2,856) | (4,865)
Asset-backed Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost |  | 66,787 |
Gross unrealized gains |  | 13 |
Gross unrealized (losses) |  | (634) |
Fair value |  | 66,166 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 50,116 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (634) |
OVER 12 MONTHS, Fair Value |  | 0 |
OVER 12 MONTHS, Unrealized (Losses) |  | 0 |
TOTAL, Fair Value |  | 50,116 |
TOTAL, Unrealized (Losses) |  | (634) |
Common Equities and Mutual Funds [Member] |  |  |
Available-for-sale equity securities [Abstract] |  |  |
Amortized cost |  | 760 | 639
Gross unrealized gains |  | 352 | 283
Gross unrealized (losses) |  | (6) | (8)
Fair value |  | 1,106 | 914
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 0 | 0
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0 | 0
OVER 12 MONTHS, Fair Value |  | 122 | 121
OVER 12 MONTHS, Unrealized (Losses) |  | (6) | (8)
TOTAL, Fair Value |  | 122 | 121
TOTAL, Unrealized (Losses) |  | $ (6) | $ (8)
[1] | Trust preferred securities are single-issuance. There are no known deferrals, defaults or excess subordination.

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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