Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan and Lease Portfolio Composition (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan and Lease Portfolio Composition (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial $ 28,850,000   $ 28,107,000      
Commercial real estate 7,201,000   7,225,000      
Automobile 12,390,000   12,100,000      
Home equity 9,907,000   10,099,000      
Residential mortgage 10,006,000   9,026,000      
Recreation Finance 2,846,000   2,438,000      
Other consumer 1,206,000   1,122,000      
Loans and leases [1] 72,406,000   70,117,000      
Allowance for loan and lease losses (741,000) $ (721,000) (691,000) $ (668,000) $ (673,000) $ (638,000)
Net loans and leases 71,665,000   69,426,000      
Loans Receivable, Fair Value Disclosure 84,000   93,000      
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Automobile 12,390,000   12,099,000      
Home equity 9,905,000   10,097,000      
Residential mortgage 9,925,000   8,937,000      
Other consumer 1,206,000   1,122,000      
Allowance for loan and lease losses (210,000) (206,000) (209,000) (193,000) (193,000) (187,000)
Consumer | Automobile            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 12,390,000   12,100,000      
Loans Receivable, Fair Value Disclosure 0   1,000      
Consumer | Home Equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 9,907,000   10,099,000      
Loans Receivable, Fair Value Disclosure 2,000   2,000      
Consumer | Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 10,006,000   9,026,000      
Loans Receivable, Fair Value Disclosure 81,000   89,000      
Consumer | RV and Marine FInance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 2,846,000   2,438,000      
Loans Receivable, Fair Value Disclosure 1,000   1,000      
Consumer | Other Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 1,206,000   1,122,000      
Loans Receivable, Fair Value Disclosure 0   0      
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial 28,850,000   28,107,000      
Commercial real estate 7,201,000   7,225,000      
Allowance for loan and lease losses (531,000) $ (515,000) (482,000) $ (475,000) $ (480,000) $ (451,000)
Commercial | Commercial and Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 28,850,000   28,107,000      
Loans Receivable, Fair Value Disclosure 0   0      
Commercial | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 7,201,000   7,225,000      
Loans Receivable, Fair Value Disclosure $ 0   $ 0      
[1] Amounts represent loans for which Huntington has elected the fair value option.