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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Available-for-sale debt securities [Abstract]    
Fair value $ 534,939 $ 558,940
Available-for-sale equity securities [Abstract]    
Fair value 936,832 910,309
Available-for-sale securities [Abstract]    
Amortized cost 1,481,758 1,435,272
Gross unrealized gains 6,230 37,257
Gross unrealized (losses) (16,217) (3,280)
Total available for sale securities 1,471,771 1,469,249
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 948,699 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) (15,116) (1,033)
OVER 12 MONTHS, Fair Value 37,475 52,770
OVER 12 MONTHS, Unrealized (Losses) (1,101) (2,247)
TOTAL, Fair Value 986,174 204,719
TOTAL, Unrealized (Losses) (16,217) (3,280)
AMORTIZED COST    
Due in one year or less 0 0
Due after one year through five years 13,248 17,370
Due after five years through ten years 408,123 426,034
Due after ten years 515,833 436,077
Total 937,204 879,481
Mortgage-backed securities 543,698 555,036
Common equities and mutual funds 856 755
Amortized cost 1,481,758 1,435,272
FAIR VALUE    
Due in one year or less 0 0
Due after one year through five years 13,386 17,897
Due after five years through ten years 410,652 446,771
Due after ten years 511,540 444,516
Total 935,578 909,184
Mortgage-backed securities 534,939 558,940
Common equities and mutual funds 1,254 1,125
Total available for sale securities 1,471,771 1,469,249
Trust Preferred Securities Subject to Mandatory Redemption [Member]    
Available-for-sale securities [Abstract]    
Amortized cost   14,936
Unrealized gain (loss)   (1,958)
Total available for sale securities   12,978
AMORTIZED COST    
Amortized cost   14,936
FAIR VALUE    
Total available for sale securities   12,978
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Standard & Poor's, BB+ Rating [Member] | Moody Credit Rating, Baa2 [Member] | Key Corp Capital I [Member]    
Available-for-sale securities [Abstract]    
Amortized cost   4,987
Unrealized gain (loss)   (798)
Total available for sale securities   4,189
AMORTIZED COST    
Amortized cost   4,987
FAIR VALUE    
Total available for sale securities   4,189
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Standard & Poor's, BB Rating [Member] | Moody Credit Rating, Baa2 [Member] | Huntington Capital Trust II SE [Member]    
Available-for-sale securities [Abstract]    
Amortized cost   4,981
Unrealized gain (loss)   (904)
Total available for sale securities   4,077
AMORTIZED COST    
Amortized cost   4,981
FAIR VALUE    
Total available for sale securities   4,077
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Standard & Poor's, BBB- Rating [Member] | Moody Credit Rating, Baa1 [Member] | PNC Capital Trust [Member]    
Available-for-sale securities [Abstract]    
Amortized cost   4,968
Unrealized gain (loss)   (256)
Total available for sale securities   4,712
AMORTIZED COST    
Amortized cost   4,968
FAIR VALUE    
Total available for sale securities   4,712
Trust Preferred Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost   14,935
Gross unrealized gains   0
Gross unrealized (losses)   (1,957)
Fair value   12,978
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value   0
LESS THAN 12 MONTHS, Unrealized (Losses)   0
OVER 12 MONTHS, Fair Value   12,978
OVER 12 MONTHS, Unrealized (Losses)   (1,957)
TOTAL, Fair Value   12,978
TOTAL, Unrealized (Losses)   (1,957)
Small Business Administration Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 78,396 78,431
Gross unrealized gains 1,104 2,288
Gross unrealized (losses) (52) 0
Fair value 79,448 80,719
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 28,331  
LESS THAN 12 MONTHS, Unrealized (Losses) (52)  
OVER 12 MONTHS, Fair Value 0  
OVER 12 MONTHS, Unrealized (Losses) 0  
TOTAL, Fair Value 28,331  
TOTAL, Unrealized (Losses) (52)  
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 740,723 668,628
Gross unrealized gains 3,432 30,141
Gross unrealized (losses) (6,172) (97)
Fair value 737,983 698,672
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 396,493 8,481
LESS THAN 12 MONTHS, Unrealized (Losses) (6,002) (58)
OVER 12 MONTHS, Fair Value 2,561 2,688
OVER 12 MONTHS, Unrealized (Losses) (170) (39)
TOTAL, Fair Value 399,054 11,169
TOTAL, Unrealized (Losses) (6,172) (97)
Asset-backed Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 118,085 117,487
Gross unrealized gains 791 73
Gross unrealized (losses) (729) (745)
Fair value 118,147 116,815
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 50,481 89,403
LESS THAN 12 MONTHS, Unrealized (Losses) (729) (745)
OVER 12 MONTHS, Fair Value 0 0
OVER 12 MONTHS, Unrealized (Losses) 0 0
TOTAL, Fair Value 50,481 89,403
TOTAL, Unrealized (Losses) (729) (745)
Mortgage-backed Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 543,698 555,036
Gross unrealized gains 497 4,382
Gross unrealized (losses) (9,256) (478)
Fair value 534,939 558,940
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 473,394 54,065
LESS THAN 12 MONTHS, Unrealized (Losses) (8,333) (230)
OVER 12 MONTHS, Fair Value 34,794 36,979
OVER 12 MONTHS, Unrealized (Losses) (923) (248)
TOTAL, Fair Value 508,188 91,044
TOTAL, Unrealized (Losses) (9,256) (478)
Debt Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 1,480,902 1,434,517
Gross unrealized gains 5,824 36,884
Gross unrealized (losses) (16,209) (3,277)
Fair value 1,470,517 1,468,124
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 948,699 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) (15,116) (1,033)
OVER 12 MONTHS, Fair Value 37,355 52,645
OVER 12 MONTHS, Unrealized (Losses) (1,093) (2,244)
TOTAL, Fair Value 986,054 204,594
TOTAL, Unrealized (Losses) (16,209) (3,277)
Common Equities and Mutual Funds [Member]    
Available-for-sale equity securities [Abstract]    
Amortized cost 856 755
Gross unrealized gains 406 373
Gross unrealized (losses) (8) (3)
Fair value 1,254 1,125
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 120 125
OVER 12 MONTHS, Unrealized (Losses) (8) (3)
TOTAL, Fair Value 120 125
TOTAL, Unrealized (Losses) $ (8) $ (3)