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SECURITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Available-for-sale debt securities [Abstract] |  |  |  |
Fair value |  | $ 576,583 | $ 657,870 |
Available-for-sale equity securities [Abstract] |  |  |  |
Fair value |  | 679,504 | 482,346 |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost |  | 1,254,661 | 1,148,414 |
Gross unrealized gains |  | 10,377 | 7,038 |
Gross unrealized (losses) |  | (8,951) | (15,236) |
Fair value |  | 1,256,087 | 1,140,216 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 545,994 | 280,692 |
OVER 12 MONTHS, Fair Value |  | 103,450 | 450,852 |
TOTAL, Fair Value |  | 649,444 | 731,544 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (5,161) | (1,442) |
OVER 12 MONTHS, Unrealized (Losses) |  | (3,790) | (13,794) |
TOTAL, Unrealized (Losses) |  | (8,951) | (15,236) |
AMORTIZED COST [Abstract] |  |  |  |
Due in one year or less |  | 0 | 2,999 |
Due after one year through five years |  | 1,174 | 9,922 |
Due after five years through ten years |  | 370,087 | 285,413 |
Due after ten years |  | 302,596 | 185,851 |
Total Amortized Cost |  | 673,857 | 484,185 |
Mortgage-backed securities |  | 580,165 | 663,690 |
Common equities and mutual funds |  | 639 | 539 |
Amortized cost |  | 1,254,661 | 1,148,414 |
FAIR VALUE [Abstract] |  |  |  |
Due in one year or less |  | 0 | 3,048 |
Due after one year through five years |  | 1,207 | 10,079 |
Due after five years through ten years |  | 376,394 | 285,698 |
Due after ten years |  | 300,989 | 182,696 |
Total Fair Value |  | 678,590 | 481,521 |
Mortgage-backed securities |  | 576,583 | 657,870 |
Common equities and mutual funds |  | 914 | 825 |
Total securities |  | 1,256,087 | 1,140,216 |
Summary of activities related to the sale of available for sale securities [Abstract] |  |  |  |
Proceeds from sales |  | 566,371 | 166,804 | $ 209,172
Gross gains on sales |  | 2,753 | 2,292 | 2,947
Gross losses on sales |  | 4,387 | 2,185 | $ 401
Held-to-maturity Securities [Abstract] |  |  |  |
Amortized cost |  | 345,744 | 282,933 |
Gross unrealized gains |  | 2,182 | 942 |
Gross unrealized (losses) |  | (1,079) | (4,563) |
Fair value |  | 346,847 | 279,312 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 89,700 | 1,056 |
OVER 12 MONTHS, Fair Value |  | 72,695 | 230,200 |
TOTAL, Fair Value |  | 162,395 | 231,256 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (442) | (2) |
OVER 12 MONTHS, Unrealized (Losses) |  | (637) | (4,561) |
TOTAL, Unrealized (Losses) |  | (1,079) | (4,563) |
AMORTIZED COST [Abstract] |  |  |  |
Due in one year or less |  | 95 | 347 |
Due after one year through five years |  | 8,411 | 4,726 |
Due after five years through ten years |  | 140,145 | 91,532 |
Due after ten years |  | 130,516 | 116,294 |
Total Amortized Cost |  | 279,167 | 212,899 |
Mortgage-backed securities |  | 66,577 | 70,034 |
Amortized cost |  | 345,744 | 282,933 |
FAIR VALUE [Abstract] |  |  |  |
Due in one year or less |  | 96 | 348 |
Due after one year through five years |  | 8,430 | 4,718 |
Due after five years through ten years |  | 140,505 | 89,984 |
Due after ten years |  | 131,712 | 116,090 |
Total Fair Value |  | 280,743 | 211,140 |
Mortgage-backed securities |  | 66,104 | 68,172 |
Total securities |  | 346,847 | 279,312 |
Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] | 14,930 | 19,368 |
Unrealized gain (loss) | [1] | (2,263) | (1,868) |
Fair value | [1] | 12,667 | 17,500 |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] | 14,930 | 19,368 |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] | 12,667 | 17,500 |
S&P Credit Rating, BB+ [Member] | Moody Credit Rating, Baa3 [Member] | Key Corp Capital I [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] | 4,986 |  |
Unrealized gain (loss) | [1] | (797) |  |
Fair value | [1] | 4,189 |  |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] | 4,986 |  |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] | 4,189 |  |
S&P Credit Rating, BB+ [Member] | Moody Credit Rating, Baa3 [Member] | Huntington Capital Trust II SE [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,977 |
Unrealized gain (loss) | [1] |  | (677) |
Fair value | [1] |  | 4,300 |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,977 |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] |  | 4,300 |
S&P Credit Rating, BB [Member] | Moody Credit Rating, Baa3 [Member] | Huntington Capital Trust II SE [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] | 4,979 |  |
Unrealized gain (loss) | [1] | (903) |  |
Fair value | [1] | 4,076 |  |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] | 4,979 |  |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] | 4,076 |  |
S&P Credit Rating, BBB- [Member] | Moody Credit Rating, Baa3 [Member] | Key Corp Capital I [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,985 |
Unrealized gain (loss) | [1] |  | (585) |
Fair value | [1] |  | 4,400 |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,985 |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] |  | 4,400 |
S&P Credit Rating, BBB- [Member] | Moody Credit Rating, Baa2 [Member] | PNC Capital Trust [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] | 4,965 |  |
Unrealized gain (loss) | [1] | (563) |  |
Fair value | [1] | 4,402 |  |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] | 4,965 |  |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] | 4,402 |  |
S&P Credit Rating, BBB [Member] | Moody Credit Rating, Baa2 [Member] | PNC Capital Trust [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,962 |
Unrealized gain (loss) | [1] |  | (562) |
Fair value | [1] |  | 4,400 |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,962 |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] |  | 4,400 |
S&P Credit Rating, A- [Member] | Moody Credit Rating, A3 [Member] | Wells Fargo (Corestates Capital) Trust [Member] | Trust Preferred Securities [Member] |  |  |  |
Available-for-sale securities [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,444 |
Unrealized gain (loss) | [1] |  | (44) |
Fair value | [1] |  | 4,400 |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost | [1] |  | 4,444 |
FAIR VALUE [Abstract] |  |  |  |
Total securities | [1] |  | 4,400 |
Debt Securities [Member] |  |  |  |
Available-for-sale debt securities [Abstract] |  |  |  |
Amortized cost |  | 1,254,022 | 1,147,875 |
Gross unrealized gains |  | 10,094 | 6,747 |
Gross unrealized (losses) |  | (8,943) | (15,231) |
Fair value |  | 1,255,173 | 1,139,391 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 545,994 | 280,569 |
OVER 12 MONTHS, Fair Value |  | 103,329 | 450,852 |
TOTAL, Fair Value |  | 649,323 | 731,421 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (5,161) | (1,437) |
OVER 12 MONTHS, Unrealized (Losses) |  | (3,782) | (13,794) |
TOTAL, Unrealized (Losses) |  | (8,943) | (15,231) |
Trust Preferred and Corporate Securities [Member] |  |  |  |
Available-for-sale debt securities [Abstract] |  |  |  |
Amortized cost |  | 16,199 | 48,747 |
Gross unrealized gains |  | 8 | 191 |
Gross unrealized (losses) |  | (2,263) | (2,009) |
Fair value |  | 13,944 | 46,929 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 0 | 6,073 |
OVER 12 MONTHS, Fair Value |  | 12,667 | 25,359 |
TOTAL, Fair Value |  | 12,667 | 31,432 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0 | (47) |
OVER 12 MONTHS, Unrealized (Losses) |  | (2,263) | (1,962) |
TOTAL, Unrealized (Losses) |  | (2,263) | (2,009) |
Small Business Administration Securities [Member] |  |  |  |
Available-for-sale debt securities [Abstract] |  |  |  |
Amortized cost |  | 54,493 | 66,541 |
Gross unrealized gains |  | 1,563 | 543 |
Gross unrealized (losses) |  | 0 | (72) |
Fair value |  | 56,056 | 67,012 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  |  | 8,454 |
OVER 12 MONTHS, Fair Value |  |  | 0 |
TOTAL, Fair Value |  |  | 8,454 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  |  | (72) |
OVER 12 MONTHS, Unrealized (Losses) |  |  | 0 |
TOTAL, Unrealized (Losses) |  |  | (72) |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Amortized cost |  | 19,540 | 19,304 |
Gross unrealized gains |  | 60 | 48 |
Gross unrealized (losses) |  | (187) | (372) |
Fair value |  | 19,413 | 18,980 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 5,528 | 1,056 |
OVER 12 MONTHS, Fair Value |  | 7,964 | 14,079 |
TOTAL, Fair Value |  | 13,492 | 15,135 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (34) | (2) |
OVER 12 MONTHS, Unrealized (Losses) |  | (153) | (370) |
TOTAL, Unrealized (Losses) |  | (187) | (372) |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost |  | 19,540 | 19,304 |
FAIR VALUE [Abstract] |  |  |  |
Total securities |  | 19,413 | 18,980 |
Non-Bank Qualified Obligation of States And Political Subdivisions [Member] |  |  |  |
Available-for-sale debt securities [Abstract] |  |  |  |
Amortized cost |  | 603,165 | 368,897 |
Gross unrealized gains |  | 7,240 | 2,494 |
Gross unrealized (losses) |  | (1,815) | (3,811) |
Fair value |  | 608,590 | 367,580 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 97,006 | 27,062 |
OVER 12 MONTHS, Fair Value |  | 42,583 | 191,146 |
TOTAL, Fair Value |  | 139,589 | 218,208 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (860) | (70) |
OVER 12 MONTHS, Unrealized (Losses) |  | (955) | (3,741) |
TOTAL, Unrealized (Losses) |  | (1,815) | (3,811) |
Held-to-maturity Securities [Abstract] |  |  |  |
Amortized cost |  | 259,627 | 193,595 |
Gross unrealized gains |  | 2,122 | 894 |
Gross unrealized (losses) |  | (419) | (2,329) |
Fair value |  | 261,330 | 192,160 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 78,663 | 0 |
OVER 12 MONTHS, Fair Value |  | 4,136 | 147,949 |
TOTAL, Fair Value |  | 82,799 | 147,949 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (365) | 0 |
OVER 12 MONTHS, Unrealized (Losses) |  | (54) | (2,329) |
TOTAL, Unrealized (Losses) |  | (419) | (2,329) |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost |  | 259,627 | 193,595 |
FAIR VALUE [Abstract] |  |  |  |
Total securities |  | 261,330 | 192,160 |
Mortgage-backed Securities [Member] |  |  |  |
Available-for-sale debt securities [Abstract] |  |  |  |
Amortized cost |  | 580,165 | 663,690 |
Gross unrealized gains |  | 1,283 | 3,519 |
Gross unrealized (losses) |  | (4,865) | (9,339) |
Fair value |  | 576,583 | 657,870 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 448,988 | 238,980 |
OVER 12 MONTHS, Fair Value |  | 48,079 | 234,347 |
TOTAL, Fair Value |  | 497,067 | 473,327 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (4,301) | (1,248) |
OVER 12 MONTHS, Unrealized (Losses) |  | (564) | (8,091) |
TOTAL, Unrealized (Losses) |  | (4,865) | (9,339) |
Held-to-maturity Securities [Abstract] |  |  |  |
Amortized cost |  | 66,577 | 70,034 |
Gross unrealized gains |  | 0 | 0 |
Gross unrealized (losses) |  | (473) | (1,862) |
Fair value |  | 66,104 | 68,172 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 5,509 | 0 |
OVER 12 MONTHS, Fair Value |  | 60,595 | 68,172 |
TOTAL, Fair Value |  | 66,104 | 68,172 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | (43) | 0 |
OVER 12 MONTHS, Unrealized (Losses) |  | (430) | (1,862) |
TOTAL, Unrealized (Losses) |  | (473) | (1,862) |
AMORTIZED COST [Abstract] |  |  |  |
Amortized cost |  | 66,577 | 70,034 |
FAIR VALUE [Abstract] |  |  |  |
Total securities |  | 66,104 | 68,172 |
Common Equities and Mutual Funds [Member] |  |  |  |
Available-for-sale equity securities [Abstract] |  |  |  |
Amortized cost |  | 639 | 539 |
Gross unrealized gains |  | 283 | 291 |
Gross unrealized (losses) |  | (8) | (5) |
Fair value |  | 914 | 825 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 0 | 123 |
OVER 12 MONTHS, Fair Value |  | 121 | 0 |
TOTAL, Fair Value |  | 121 | 123 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0 | (5) |
OVER 12 MONTHS, Unrealized (Losses) |  | (8) | 0 |
TOTAL, Unrealized (Losses) |  | $ (8) | $ (5) |
[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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- Definition Amount of available-for-sale equity securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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