Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details)

v2.4.0.6
Benefit Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in Fair Value of Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance $ 633,617 $ 538,970  
Pension Benefits [Member]
      
Components of net periodic benefit expense [Abstract]      
Service cost 24,869 21,650 20,205
Interest cost 29,215 30,073 28,869
Expected return on plan assets (45,730) (43,290) (42,113)
Amortization of transition asset (4) (5) 5
Amortization of prior service cost (5,767) (5,767) (5,766)
Amortization of gains (losses) 26,956 23,494 14,989
Settlements 5,405 5,483 9,694
Benefit cost 34,944 31,638 25,883
Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance 656,339 577,770  
Service cost 24,869 21,650 20,205
Interest cost 29,215 30,073 28,869
Benefits Paid (13,719) (12,285)  
Settlements (10,444) (10,408)  
Gross Prescription Drug Subsidy Receipts Received 0 0  
Actuarial Net (Gains) Losses 97,518 49,539  
Period Increase (Decrease) 127,439 78,569  
Defined Benefit Plan, Benefit Obligation, Ending Balance 783,778 656,339 577,770
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount Rate 3.83% 4.57%  
Rate of Compensation Increase 4.50% 4.50%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount Rate 4.57% 5.35%  
Long-term Return on Assets 8.00% 8.00%  
Compensation Increase 4.50% 4.50%  
Change in Fair Value of Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 538,970 478,479  
Actual Return on Plan Assets 43,810 (6,593)  
Contributions by Employer 75,000 90,000  
Settlements, Plan Assets (10,444) (10,631)  
Business Combinations and Acquisitions 0 0  
Benefits Paid (13,719) (12,285)  
Period Increase (Decrease) 94,647 60,491  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 633,617 538,970 478,479
Estimated Future Benefit Payments [Abstract]      
2013 42,743    
2014 42,537    
2015 42,960    
2016 43,329    
2017 43,903    
2018 through 2022 240,842    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Shares of Huntington Stock 5,764,986 [1] 7,309,986 [1]  
Dividends on Huntington Stock 1,085 409  
Post Retirement Benefits [Member]
      
Components of net periodic benefit expense [Abstract]      
Service cost 0 0 0
Interest cost 1,350 1,618 1,731
Expected return on plan assets 0 0 0
Amortization of transition asset 0 0 0
Amortization of prior service cost (1,353) (1,354) (1,353)
Amortization of gains (losses) (332) (423) (699)
Settlements 0 0 0
Benefit cost (335) (159) (321)
Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance 32,851 34,241  
Service cost 0 0 0
Interest cost 1,350 1,618 1,731
Benefits Paid (3,850) (4,895)  
Settlements 0 0  
Gross Prescription Drug Subsidy Receipts Received 740 670  
Actuarial Net (Gains) Losses (3,304) 1,217  
Period Increase (Decrease) (5,064) (1,390)  
Defined Benefit Plan, Benefit Obligation, Ending Balance 27,787 32,851 34,241
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount Rate 3.28% 4.34%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount Rate 4.34% 5.00%  
Change in Fair Value of Plan Assets [Abstract]      
Benefits Paid (3,850) (4,895)  
Estimated Future Benefit Payments [Abstract]      
2013   3,837  
2014   3,585  
2015   3,369  
2016   3,156  
2017   2,994  
2018 through 2022   12,380  
Defined Contribution Pension [Member]
      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Market Value-Amount of Huntington common stock 95,160 82,632  
Shares of Huntington Stock 14,892,094 15,051,291  
Dividends on Huntington Stock $ 2,414 $ 1,055  
[1] The Plan has acquired and held Huntington common stock in compliance at all times with Section 407 of the Employee Retirement Income Security Act of 1978.