Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases $ 28,058,712 $ 20,559,834
Commercial real estate loans 7,300,901 5,268,651
Automobile loans 10,968,782 9,480,678
Home equity loans 10,105,774 8,470,482
Residential mortgage loans 7,724,961 5,998,400
Other consumer loans [1] 956,419 563,054
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 28,058,712 20,559,834
Commercial real estate loans 7,300,901 5,268,651
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 26,211,885 19,257,789
Commercial real estate loans 7,042,304 5,066,054
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 810,287 399,339
Commercial real estate loans 96,975 79,787
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 1,028,819 895,577
Commercial real estate loans 159,098 121,167
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 7,721 7,129
Commercial real estate loans 2,524 1,643
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 10,966,628 9,480,678
Home equity loans 10,102,501 8,470,482
Residential mortgage loans 7,650,025 5,998,400
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 1,844,928 0
Other consumer loans 955,982 563,054
Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 5,369,085 4,680,684
Home equity loans 6,280,328 5,210,741
Residential mortgage loans 4,662,777 3,564,064
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 1,064,143 0
Other consumer loans 346,867 233,969
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 4,043,611 3,454,585
Home equity loans 2,891,330 2,466,425
Residential mortgage loans 2,285,121 1,813,779
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 644,039 0
Other consumer loans 455,959 269,746
Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 1,298,460 1,086,914
Home equity loans 637,560 582,326
Residential mortgage loans 615,067 567,984
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 72,995 0
Other consumer loans 133,243 49,650
Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 255,472 258,495
Home equity loans 293,283 210,990
Residential mortgage loans 87,060 52,573
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 63,751 0
Other consumer loans $ 19,913 $ 9,689
[1] Amounts represent loans for which Huntington has elected the fair value option.