Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period $ 613,719 $ 605,126 $ 597,843 $ 605,196        
Loan charge-offs (43,545) (46,970) (103,237) (102,045)        
Recoveries of loans previously charged-off 26,790 21,595 77,930 52,238        
Provision for loan and lease losses (26,086) (19,790) (50,424) (46,445)        
Allowance for loans sold or transferred to loans held for sale (14) (1) (104) (2,292)        
ALLL balance, end of period 623,064 599,542 623,064 599,542        
Provision for unfunded loan commitments and letters of credit 1,577 (629) (1,667) 5,435        
AULC Balance, end of period 73,748 55,371 73,748 55,371 $ 75,325 $ 72,081 $ 54,742 $ 60,806
ACL balance, end of period 696,812 654,913 696,812 654,913        
Commercial and Industrial                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 320,367 284,573 298,746 286,995        
Loan charge-offs (14,743) (12,213) (31,566) (36,825)        
Recoveries of loans previously charged-off 11,041 7,802 21,350 21,011        
Provision for loan and lease losses (6,800) (4,879) (34,935) (13,860)        
Allowance for loans sold or transferred to loans held for sale 0 0 0 0        
ALLL balance, end of period 323,465 285,041 323,465 285,041        
Provision for unfunded loan commitments and letters of credit 2,343 466 (156) 7,139        
AULC Balance, end of period 56,042 41,849 56,042 41,849 58,385 55,886 42,315 48,988
ACL balance, end of period 379,507 326,890 379,507 326,890        
Commercial Real Estate                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 102,074 100,752 100,007 102,839        
Loan charge-offs (2,190) (8,288) (14,316) (10,301)        
Recoveries of loans previously charged-off 2,863 2,763 32,465 8,788        
Provision for loan and lease losses 1,705 3,167 17,114 9,266        
Allowance for loans sold or transferred to loans held for sale 0 0 0 0        
ALLL balance, end of period 101,042 92,060 101,042 92,060        
Provision for unfunded loan commitments and letters of credit (188) (247) (113) 263        
AULC Balance, end of period 7,675 5,778 7,675 5,778 7,487 7,562 5,531 6,041
ACL balance, end of period 108,717 97,838 108,717 97,838        
Automobile                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 48,032 37,125 49,504 33,466        
Loan charge-offs (8,850) (7,691) (20,336) (15,794)        
Recoveries of loans previously charged-off 4,530 4,249 9,246 8,104        
Provision for loan and lease losses (6,819) (5,418) (12,117) (15,618)        
Allowance for loans sold or transferred to loans held for sale 0 (1) 0 (2,292)        
ALLL balance, end of period 50,531 39,102 50,531 39,102        
Provision for unfunded loan commitments and letters of credit 0 0 0 0        
AULC Balance, end of period 0 0 0 0 0 0 0 0
ACL balance, end of period 50,531 39,102 50,531 39,102        
Home Equity                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 78,102 110,280 83,671 96,413        
Loan charge-offs (5,910) (8,629) (13,620) (17,215)        
Recoveries of loans previously charged-off 4,832 3,979 8,861 7,940        
Provision for loan and lease losses 542 (5,548) 2,430 (24,040)        
Allowance for loans sold or transferred to loans held for sale 0 0 0 0        
ALLL balance, end of period 76,482 111,178 76,482 111,178        
Provision for unfunded loan commitments and letters of credit (40) 117 (82) (598)        
AULC Balance, end of period 2,150 2,522 2,150 2,522 2,110 2,068 2,639 1,924
ACL balance, end of period 78,632 113,700 78,632 113,700        
Residential Mortgage                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 40,842 55,380 41,646 47,211        
Loan charge-offs (2,923) (3,610) (5,683) (8,473)        
Recoveries of loans previously charged-off 2,147 1,468 3,260 3,515        
Provision for loan and lease losses (2,312) 1,559 (3,065) (9,426)        
Allowance for loans sold or transferred to loans held for sale (14) 0 (104) 0        
ALLL balance, end of period 42,392 51,679 42,392 51,679        
Provision for unfunded loan commitments and letters of credit 11 (8) 9 (9)        
AULC Balance, end of period 9 17 9 17 20 18 9 8
ACL balance, end of period 42,401 51,696 42,401 51,696        
Other Consumer                
Allowance For Credit Losses Roll Forward [Abstract]                
ALLL balance, beginning of period 24,302 17,016 24,269 38,272        
Loan charge-offs (8,929) (6,539) (17,716) (13,437)        
Recoveries of loans previously charged-off 1,377 1,334 2,748 2,880        
Provision for loan and lease losses (12,402) (8,671) (19,851) 7,233        
Allowance for loans sold or transferred to loans held for sale 0 0 0 0        
ALLL balance, end of period 29,152 20,482 29,152 20,482        
Provision for unfunded loan commitments and letters of credit (549) (957) (1,325) (1,360)        
AULC Balance, end of period 7,872 5,205 7,872 5,205 $ 7,323 $ 6,547 $ 4,248 $ 3,845
ACL balance, end of period $ 37,024 $ 25,687 $ 37,024 $ 25,687