SECURITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Sep. 30, 2013
Debt securities [Abstract]
Amortized cost	$ 1,060,969		$ 916,408
Gross Unrealized Gains	4,592		4,586
Gross Unrealized Losses	(31,958)		(39,801)
Debt, securities, fair value	1,033,603		881,193
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Amortized cost	290,311		288,026
Held-to-maturity Securities, Gross Unrealized Gains	318		13
Held-to-maturity Securities, Gross Unrealized Losses	(12,455)		(17,521)
Held-to-maturity Securities, Fair Value	278,174		270,518
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	1,060,969		916,408
Debt securities, fair value	1,033,603		881,193
Gross Unrealized Losses	(31,958)		(39,801)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	496,051		627,618
OVER 12 MONTHS, Fair Value	172,253		13,477
Fair Value	668,304		641,095
LESS THAN 12 MONTHS, Unrealized (Losses)	(20,845)		(36,985)
OVER 12 MONTHS, Unrealized (Losses)	(11,113)		(2,816)
Unrealized (Losses)	(31,958)		(39,801)
Held-to-maturity securities, continuous unrealized loss position [Abstract]
Held-to-maturity Securities, LESS THAN 12 MONTHS, Fair Value	216,434		269,429
Held-to-maturity Securities, OVER 12 MONTHS, Fair Value	45,622		0
Held-to-maturity Securities, Fair Value	262,056		269,429
Held-to-maturity Securities, LESS THAN 12 MONTHS, Unrealized (Losses)	(10,325)		(17,521)
Held-to-maturity Securities, OVER 12 MONTHS, Unrealized (Losses)	(2,130)		0
Held-to-maturity Securities, Unrealized (Losses)	(12,455)		(17,521)
AMORTIZED COST [Abstract]
Due in one year or less	0		0
Due after one year through five years	11,172		9,929
Due after five years through ten years	243,806		162,203
Due after ten years	176,018		147,933
Total Amortized Cost	430,996		320,065
Mortgage-backed securities	629,973		596,343
Total debt securities	1,060,969		916,408
FAIR VALUE [Abstract]
Due in one year or less	0		0
Due after one year through five years	11,362		10,061
Due after five years through ten years	238,203		155,014
Due after ten years	167,866		134,746
Total Fair Value	417,431		299,821
Mortgage-backed securities	616,172		581,372
Securities available for sale	1,033,603		881,193
AMORTIZED COST [Abstract]
Due in one year or less	345		649
Due after one year through five years	4,112		2,234
Due after five years through ten years	71,453		50,547
Due after ten years	140,725		157,669
Total Amortized Cost	216,635		211,099
Mortgage-backed securities	73,676		76,927
Total debt securities	290,311		288,026
FAIR VALUE [Abstract]
Due in one year or less	346		649
Due after one year through five years	4,063		2,203
Due after five years through ten years	68,424		47,519
Due after ten years	135,157		147,046
Total Fair Value	207,990		197,417
Mortgage-backed securities	70,184		73,101
Total debt securities	278,174		270,518
Trust Preferred Securities [Member]
Debt securities [Abstract]
Amortized cost	19,343	[1]	19,318	[1]
Gross Unrealized Losses	(2,692)	[1]	(2,918)	[1]
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	19,343	[1]	19,318	[1]
Debt securities, fair value	16,651	[1]	16,400	[1]
Gross Unrealized Losses	(2,692)	[1]	(2,918)	[1]
FAIR VALUE [Abstract]
Securities available for sale	16,651	[1]	16,400	[1]
S&P Credit Rating, BBB- [Member] | Moody Credit Rating, Baa3 [Member] | Key Corp Capital I [Member] | Trust Preferred Securities [Member]
Debt securities [Abstract]
Amortized cost	4,985	[1]	4,984	[1]
Gross Unrealized Losses	(769)	[1]	(884)	[1]
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	4,985	[1]	4,984	[1]
Debt securities, fair value	4,216	[1]	4,100	[1]
Gross Unrealized Losses	(769)	[1]	(884)	[1]
FAIR VALUE [Abstract]
Securities available for sale	4,216	[1]	4,100	[1]
S&P Credit Rating, BB+ [Member] | Moody Credit Rating, Baa3 [Member] | Huntington Capital Trust II SE [Member] | Trust Preferred Securities [Member]
Debt securities [Abstract]
Amortized cost	4,976	[1]	4,976	[1]
Gross Unrealized Losses	(876)	[1]	(901)	[1]
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	4,976	[1]	4,976	[1]
Debt securities, fair value	4,100	[1]	4,075	[1]
Gross Unrealized Losses	(876)	[1]	(901)	[1]
FAIR VALUE [Abstract]
Securities available for sale	4,100	[1]	4,075	[1]
S&P Credit Rating, BBB [Member] | Moody Credit Rating, Baa2 [Member] | PNC Capital Trust [Member] | Trust Preferred Securities [Member]
Debt securities [Abstract]
Amortized cost	4,961	[1]	4,959	[1]
Gross Unrealized Losses	(799)	[1]	(784)	[1]
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	4,961	[1]	4,959	[1]
Debt securities, fair value	4,162	[1]	4,175	[1]
Gross Unrealized Losses	(799)	[1]	(784)	[1]
FAIR VALUE [Abstract]
Securities available for sale	4,162	[1]	4,175	[1]
S&P Credit Rating, A- [Member] | Moody Credit Rating, A3 [Member] | Wells Fargo (Corestates Capital) Trust [Member] | Trust Preferred Securities [Member]
Debt securities [Abstract]
Amortized cost	4,421	[1]	4,399	[1]
Gross Unrealized Losses	(248)	[1]	(349)	[1]
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	4,421	[1]	4,399	[1]
Debt securities, fair value	4,173	[1]	4,050	[1]
Gross Unrealized Losses	(248)	[1]	(349)	[1]
FAIR VALUE [Abstract]
Securities available for sale	4,173	[1]	4,050	[1]
Trust Preferred and Corporate Securities [Member]
Debt securities [Abstract]
Amortized cost	55,902		52,897
Gross Unrealized Gains	184		136
Gross Unrealized Losses	(3,641)		(4,249)
Debt, securities, fair value	52,445		48,784
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	55,902		52,897
Gross Unrealized Losses	(3,641)		(4,249)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	16,988		29,312
OVER 12 MONTHS, Fair Value	22,313		13,477
Fair Value	39,301		42,789
LESS THAN 12 MONTHS, Unrealized (Losses)	(545)		(1,433)
OVER 12 MONTHS, Unrealized (Losses)	(3,096)		(2,816)
Unrealized (Losses)	(3,641)		(4,249)
Agency and Instrumentality Securities [Member]
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Amortized cost	10,000		10,003
Held-to-maturity Securities, Gross Unrealized Gains	0		0
Held-to-maturity Securities, Gross Unrealized Losses	(303)		(390)
Held-to-maturity Securities, Fair Value	9,697		9,613
Held-to-maturity securities, continuous unrealized loss position [Abstract]
Held-to-maturity Securities, LESS THAN 12 MONTHS, Fair Value	9,697		9,613
Held-to-maturity Securities, OVER 12 MONTHS, Fair Value	0		0
Held-to-maturity Securities, Fair Value	9,697		9,613
Held-to-maturity Securities, LESS THAN 12 MONTHS, Unrealized (Losses)	(303)		(390)
Held-to-maturity Securities, OVER 12 MONTHS, Unrealized (Losses)	0		0
Held-to-maturity Securities, Unrealized (Losses)	(303)		(390)
Small Business Administration Securities [Member]
Debt securities [Abstract]
Amortized cost	52,799		10,099
Gross Unrealized Gains	632		482
Gross Unrealized Losses	0		0
Debt, securities, fair value	53,431		10,581
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	52,799		10,099
Gross Unrealized Losses	0		0
Obligations of States and Political Subdivisions [Member]
Debt securities [Abstract]
Amortized cost			1,880
Gross Unrealized Gains			0
Gross Unrealized Losses			(153)
Debt, securities, fair value			1,727
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Amortized cost	18,567		19,549
Held-to-maturity Securities, Gross Unrealized Gains	22		13
Held-to-maturity Securities, Gross Unrealized Losses	(804)		(1,220)
Held-to-maturity Securities, Fair Value	17,785		18,342
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost			1,880
Gross Unrealized Losses			(153)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value			1,727
OVER 12 MONTHS, Fair Value			0
Fair Value			1,727
LESS THAN 12 MONTHS, Unrealized (Losses)			(153)
OVER 12 MONTHS, Unrealized (Losses)			0
Unrealized (Losses)			(153)
Held-to-maturity securities, continuous unrealized loss position [Abstract]
Held-to-maturity Securities, LESS THAN 12 MONTHS, Fair Value	12,828		17,253
Held-to-maturity Securities, OVER 12 MONTHS, Fair Value	2,991		0
Held-to-maturity Securities, Fair Value	15,819		17,253
Held-to-maturity Securities, LESS THAN 12 MONTHS, Unrealized (Losses)	(583)		(1,220)
Held-to-maturity Securities, OVER 12 MONTHS, Unrealized (Losses)	(221)		0
Held-to-maturity Securities, Unrealized (Losses)	(804)		(1,220)
Non Bank Qualified Obligation U S States And Political Subdivisions [Member]
Debt securities [Abstract]
Amortized cost	321,754		255,189
Gross Unrealized Gains	290		0
Gross Unrealized Losses	(11,303)		(16,460)
Debt, securities, fair value	310,741		238,729
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Amortized cost	188,068		181,547
Held-to-maturity Securities, Gross Unrealized Gains	296		0
Held-to-maturity Securities, Gross Unrealized Losses	(7,856)		(12,085)
Held-to-maturity Securities, Fair Value	180,508		169,462
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	321,754		255,189
Gross Unrealized Losses	(11,303)		(16,460)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	164,930		238,729
OVER 12 MONTHS, Fair Value	97,806		0
Fair Value	262,736		238,729
LESS THAN 12 MONTHS, Unrealized (Losses)	(5,699)		(16,460)
OVER 12 MONTHS, Unrealized (Losses)	(5,604)		0
Unrealized (Losses)	(11,303)		(16,460)
Held-to-maturity securities, continuous unrealized loss position [Abstract]
Held-to-maturity Securities, LESS THAN 12 MONTHS, Fair Value	123,726		169,462
Held-to-maturity Securities, OVER 12 MONTHS, Fair Value	42,631		0
Held-to-maturity Securities, Fair Value	166,357		169,462
Held-to-maturity Securities, LESS THAN 12 MONTHS, Unrealized (Losses)	(5,947)		(12,085)
Held-to-maturity Securities, OVER 12 MONTHS, Unrealized (Losses)	(1,909)		0
Held-to-maturity Securities, Unrealized (Losses)	(7,856)		(12,085)
Mortgage-backed Securities [Member]
Debt securities [Abstract]
Amortized cost	629,973		596,343
Gross Unrealized Gains	3,204		3,968
Gross Unrealized Losses	(17,005)		(18,939)
Debt, securities, fair value	616,172		581,372
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities, Amortized cost	73,676		76,927
Held-to-maturity Securities, Gross Unrealized Gains	0		0
Held-to-maturity Securities, Gross Unrealized Losses	(3,492)		(3,826)
Held-to-maturity Securities, Fair Value	70,184		73,101
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	629,973		596,343
Gross Unrealized Losses	(17,005)		(18,939)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	314,012		357,850
OVER 12 MONTHS, Fair Value	52,134		0
Fair Value	366,146		357,850
LESS THAN 12 MONTHS, Unrealized (Losses)	(14,592)		(18,939)
OVER 12 MONTHS, Unrealized (Losses)	(2,413)		0
Unrealized (Losses)	(17,005)		(18,939)
Held-to-maturity securities, continuous unrealized loss position [Abstract]
Held-to-maturity Securities, LESS THAN 12 MONTHS, Fair Value	70,183		73,101
Held-to-maturity Securities, OVER 12 MONTHS, Fair Value	0		0
Held-to-maturity Securities, Fair Value	70,183		73,101
Held-to-maturity Securities, LESS THAN 12 MONTHS, Unrealized (Losses)	(3,492)		(3,826)
Held-to-maturity Securities, OVER 12 MONTHS, Unrealized (Losses)	0		0
Held-to-maturity Securities, Unrealized (Losses)	(3,492)		(3,826)
Common Equities and Mutual Funds [Member]
Debt securities [Abstract]
Amortized cost	541
Gross Unrealized Gains	282
Gross Unrealized Losses	(9)
Debt, securities, fair value	814
Trust preferred securities included in available-for-sale securities [Abstract]
Amortized cost	541
Gross Unrealized Losses	(9)
Gross unrealized losses and fair value of securities in continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	121
OVER 12 MONTHS, Fair Value	0
Fair Value	121
LESS THAN 12 MONTHS, Unrealized (Losses)	(9)
OVER 12 MONTHS, Unrealized (Losses)	0
Unrealized (Losses)	$ (9)

[1] Trust preferred securities are single-issuance. There are no known deferrals, defaults or excess subordination.