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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.

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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.

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