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SECURITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Available-for-sale debt securities [Abstract] |  |  |
Mortgage-backed securities available-for-sale | $ 558,940 | $ 576,583 |
Available-for-sale equity securities [Abstract] |  |  |
Fair value | 910,309 | 679,504 |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | 1,435,272 | 1,254,661 |
Gross unrealized gains | 37,257 | 10,377 |
Gross unrealized (losses) | (3,280) | (8,951) |
Total securities | 1,469,249 | 1,256,087 |
Amortized Cost | 1,435,272 | 1,254,661 |
Fair Value | 1,469,249 | 1,256,087 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 151,949 | 545,994 |
OVER 12 MONTHS, Fair Value | 52,770 | 103,450 |
TOTAL, Fair Value | 204,719 | 649,444 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,033) | (5,161) |
OVER 12 MONTHS, Unrealized (Losses) | (2,247) | (3,790) |
TOTAL, Unrealized (Losses) | (3,280) | (8,951) |
AMORTIZED COST [Abstract] |  |  |
Due in one year or less | 0 | 0 |
Due after one year through five years | 17,370 | 1,174 |
Due after five years through ten years | 426,034 | 370,087 |
Due after ten years | 436,077 | 302,596 |
Total Amortized Cost | 879,481 | 673,857 |
Mortgage-backed securities | 555,036 | 580,165 |
Common equities and mutual funds | 755 | 639 |
Amortized cost | 1,435,272 | 1,254,661 |
FAIR VALUE [Abstract] |  |  |
Due in one year or less | 0 | 0 |
Due after one year through five years | 17,897 | 1,207 |
Due after five years through ten years | 446,771 | 376,394 |
Due after ten years | 444,516 | 300,989 |
Total Fair Value | 909,184 | 678,590 |
Common equities and mutual funds | 1,125 | 914 |
Total securities | 1,469,249 | 1,256,087 |
Summary of activities related to the sale of available for sale securities [Abstract] |  |  |
Proceeds from sales | 285,508 | 566,371 | $ 166,804
Gross gains on sales | 1,459 | 2,753 | 2,292
Gross losses on sales | 1,785 | 4,387 | $ 2,185
Held-to-maturity Securities [Abstract] |  |  |
Amortized cost | 619,853 | 345,744 |
Gross unrealized gains | 12,807 | 2,182 |
Gross unrealized (losses) | (86) | (1,079) |
Fair value | 632,574 | 346,847 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 24,264 | 89,700 |
OVER 12 MONTHS, Fair Value | 2,256 | 72,695 |
TOTAL, Fair Value | 26,520 | 162,395 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (55) | (442) |
OVER 12 MONTHS, Unrealized (Losses) | (31) | (637) |
TOTAL, Unrealized (Losses) | (86) | (1,079) |
AMORTIZED COST [Abstract] |  |  |
Due in one year or less | 472 | 95 |
Due after one year through five years | 12,502 | 8,411 |
Due after five years through ten years | 157,944 | 140,145 |
Due after ten years | 315,177 | 130,516 |
Total Amortized Cost | 486,095 | 279,167 |
Mortgage-backed securities | 133,758 | 66,577 |
Amortized cost | 619,853 | 345,744 |
FAIR VALUE [Abstract] |  |  |
Due in one year or less | 471 | 96 |
Due after one year through five years | 12,696 | 8,430 |
Due after five years through ten years | 163,806 | 140,505 |
Due after ten years | 321,166 | 131,712 |
Total Fair Value | 498,139 | 280,743 |
Mortgage-backed securities | 134,435 | 66,104 |
Total securities | 632,574 | 346,847 |
Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | 14,936 | 14,930 |
Total securities | 12,978 | 12,667 |
Amortized Cost | 14,936 | 14,930 |
Fair Value | 12,978 | 12,667 |
Unrealized Gain (Loss) | (1,958) | (2,263) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 14,936 | 14,930 |
FAIR VALUE [Abstract] |  |  |
Total securities | 12,978 | 12,667 |
S&P Credit Rating, BB+ [Member] | Moody's Credit Rating, Baa2 [Member] | Key Corp Capital I [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | 4,987 | 4,986 |
Total securities | 4,189 | 4,189 |
Amortized Cost | 4,987 | 4,986 |
Fair Value | 4,189 | 4,189 |
Unrealized Gain (Loss) | (798) | (797) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 4,987 | 4,986 |
FAIR VALUE [Abstract] |  |  |
Total securities | 4,189 | 4,189 |
S&P Credit Rating, BB [Member] | Moody's Credit Rating, Baa2 [Member] | Huntington Capital Trust II SE [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | 4,981 | 4,979 |
Total securities | 4,077 | 4,076 |
Amortized Cost | 4,981 | 4,979 |
Fair Value | 4,077 | 4,076 |
Unrealized Gain (Loss) | (904) | (903) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 4,981 | 4,979 |
FAIR VALUE [Abstract] |  |  |
Total securities | 4,077 | 4,076 |
Standard & Poor's, BBB- Rating [Member] | Moody's Credit Rating, Baa1 [Member] | PNC Capital Trust [Member] | Trust Preferred Securities [Member] |  |  |
Available-for-sale securities [Abstract] |  |  |
Amortized cost | 4,968 | 4,965 |
Total securities | 4,712 | 4,402 |
Amortized Cost | 4,968 | 4,965 |
Fair Value | 4,712 | 4,402 |
Unrealized Gain (Loss) | (256) | (563) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 4,968 | 4,965 |
FAIR VALUE [Abstract] |  |  |
Total securities | 4,712 | 4,402 |
Trust preferred and corporate securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 14,935 | 16,199 |
Gross unrealized gains | 0 | 8 |
Gross unrealized (losses) | (1,957) | (2,263) |
Mortgage-backed securities available-for-sale | 12,978 | 13,944 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 0 |  |
OVER 12 MONTHS, Fair Value | 12,978 |  |
TOTAL, Fair Value | 12,978 |  |
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 |  |
OVER 12 MONTHS, Unrealized (Losses) | (1,957) |  |
TOTAL, Unrealized (Losses) | (1,957) |  |
Small Business Administration Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 78,431 | 54,493 |
Gross unrealized gains | 2,288 | 1,563 |
Gross unrealized (losses) | 0 | 0 |
Mortgage-backed securities available-for-sale | 80,719 | 56,056 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value |  | 0 |
OVER 12 MONTHS, Fair Value |  | 12,667 |
TOTAL, Fair Value |  | 12,667 |
LESS THAN 12 MONTHS, Unrealized (Losses) |  | 0 |
OVER 12 MONTHS, Unrealized (Losses) |  | (2,263) |
TOTAL, Unrealized (Losses) |  | (2,263) |
Non-Bank Qualified Obligation of States And Political Subdivisions [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 668,628 | 603,165 |
Gross unrealized gains | 30,141 | 7,240 |
Gross unrealized (losses) | (97) | (1,815) |
Mortgage-backed securities available-for-sale | 698,672 | 608,590 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 8,481 | 97,006 |
OVER 12 MONTHS, Fair Value | 2,688 | 42,583 |
TOTAL, Fair Value | 11,169 | 139,589 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (58) | (860) |
OVER 12 MONTHS, Unrealized (Losses) | (39) | (955) |
TOTAL, Unrealized (Losses) | (97) | (1,815) |
Asset-backed Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 117,487 |  |
Gross unrealized gains | 73 |  |
Gross unrealized (losses) | (745) |  |
Mortgage-backed securities available-for-sale | 116,815 |  |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 89,403 |  |
OVER 12 MONTHS, Fair Value | 0 |  |
TOTAL, Fair Value | 89,403 |  |
LESS THAN 12 MONTHS, Unrealized (Losses) | (745) |  |
OVER 12 MONTHS, Unrealized (Losses) | 0 |  |
TOTAL, Unrealized (Losses) | (745) |  |
Collateralized Mortgage Backed Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 555,036 | 580,165 |
Gross unrealized gains | 4,382 | 1,283 |
Gross unrealized (losses) | (478) | (4,865) |
Mortgage-backed securities available-for-sale | 558,940 | 576,583 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 54,065 | 448,988 |
OVER 12 MONTHS, Fair Value | 36,979 | 48,079 |
TOTAL, Fair Value | 91,044 | 497,067 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (230) | (4,301) |
OVER 12 MONTHS, Unrealized (Losses) | (248) | (564) |
TOTAL, Unrealized (Losses) | (478) | (4,865) |
Debt Securities [Member] |  |  |
Available-for-sale debt securities [Abstract] |  |  |
Amortized cost | 1,434,517 | 1,254,022 |
Gross unrealized gains | 36,884 | 10,094 |
Gross unrealized (losses) | (3,277) | (8,943) |
Mortgage-backed securities available-for-sale | 1,468,124 | 1,255,173 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 151,949 | 545,994 |
OVER 12 MONTHS, Fair Value | 52,645 | 103,329 |
TOTAL, Fair Value | 204,594 | 649,323 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (1,033) | (5,161) |
OVER 12 MONTHS, Unrealized (Losses) | (2,244) | (3,782) |
TOTAL, Unrealized (Losses) | (3,277) | (8,943) |
Common Equities And Mutual Funds [Member] |  |  |
Available-for-sale equity securities [Abstract] |  |  |
Amortized cost | 755 | 639 |
Gross unrealized gains | 373 | 283 |
Gross unrealized (losses) | (3) | (8) |
Fair value | 1,125 | 914 |
Available-for-sale securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 0 | 0 |
OVER 12 MONTHS, Fair Value | 125 | 121 |
TOTAL, Fair Value | 125 | 121 |
LESS THAN 12 MONTHS, Unrealized (Losses) | 0 | 0 |
OVER 12 MONTHS, Unrealized (Losses) | (3) | (8) |
TOTAL, Unrealized (Losses) | (3) | (8) |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Held-to-maturity Securities [Abstract] |  |  |
Amortized cost | 20,626 | 19,540 |
Gross unrealized gains | 355 | 60 |
Gross unrealized (losses) | (44) | (187) |
Fair value | 20,937 | 19,413 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 2,909 | 5,528 |
OVER 12 MONTHS, Fair Value | 2,256 | 7,964 |
TOTAL, Fair Value | 5,165 | 13,492 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (13) | (34) |
OVER 12 MONTHS, Unrealized (Losses) | (31) | (153) |
TOTAL, Unrealized (Losses) | (44) | (187) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 20,626 | 19,540 |
FAIR VALUE [Abstract] |  |  |
Total securities | 20,937 | 19,413 |
Non-Bank Qualified Obligation of States And Political Subdivisions [Member] |  |  |
Held-to-maturity Securities [Abstract] |  |  |
Amortized cost | 465,469 | 259,627 |
Gross unrealized gains | 11,744 | 2,122 |
Gross unrealized (losses) | (11) | (419) |
Fair value | 477,202 | 261,330 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 1,294 | 78,663 |
OVER 12 MONTHS, Fair Value | 0 | 4,136 |
TOTAL, Fair Value | 1,294 | 82,799 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (11) | (365) |
OVER 12 MONTHS, Unrealized (Losses) | 0 | (54) |
TOTAL, Unrealized (Losses) | (11) | (419) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 465,469 | 259,627 |
FAIR VALUE [Abstract] |  |  |
Total securities | 477,202 | 261,330 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Held-to-maturity Securities [Abstract] |  |  |
Amortized cost | 133,758 | 66,577 |
Gross unrealized gains | 708 | 0 |
Gross unrealized (losses) | (31) | (473) |
Fair value | 134,435 | 66,104 |
Held-to-maturity securities in a continuous unrealized loss position [Abstract] |  |  |
LESS THAN 12 MONTHS, Fair Value | 20,061 | 5,509 |
OVER 12 MONTHS, Fair Value | 0 | 60,595 |
TOTAL, Fair Value | 20,061 | 66,104 |
LESS THAN 12 MONTHS, Unrealized (Losses) | (31) | (43) |
OVER 12 MONTHS, Unrealized (Losses) | 0 | (430) |
TOTAL, Unrealized (Losses) | (31) | (473) |
AMORTIZED COST [Abstract] |  |  |
Amortized cost | 133,758 | 66,577 |
FAIR VALUE [Abstract] |  |  |
Total securities | $ 134,435 | $ 66,104 |

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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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- 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=73527792&loc=d3e27161-111563 + Details
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