Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment $ 532,678 $ 526,854    
Attributable to loans individually evaluated for impairment 62,436 74,243    
Total ALLL balance: 597,843 605,196 $ 647,870 $ 769,075
Collectively evaluated for impairment 49,027,030 46,443,186    
Individually evaluated for impairment 1,277,788 1,148,978    
Total loans and leases evaluated for impairment [1] 50,341,099 47,655,726    
With allowance assigned to the loan and lease balances 989,956 1,063,224    
With no allowance assigned to the loan and lease balances 324,113 149,316    
Total 1,314,069 1,212,540    
Average balance of impaired loans 1,284,719 1,366,329    
ALLL on impaired loans 65,165 78,342    
Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 2,729 4,099    
Total ALLL balance: 3,000 4,000    
Collectively evaluated for impairment 36,281 63,562    
C&I        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 276,830 272,100    
Attributable to loans individually evaluated for impairment 19,314 11,049    
Total ALLL balance: 298,746 286,995 265,801 241,051
Collectively evaluated for impairment 20,057,784 18,792,925    
Individually evaluated for impairment 481,033 216,993    
Total loans and leases evaluated for impairment 20,559,834 19,033,146    
With allowance assigned to the loan and lease balances 246,249 202,376    
With no allowance assigned to the loan and lease balances 255,801 37,845    
Total 502,050 240,221    
Average balance of impaired loans 382,051 174,316    
ALLL on impaired loans 21,916 14,895    
C&I | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 2,602 3,846    
Collectively evaluated for impairment 21,017 23,228    
Total loans and leases evaluated for impairment 21,017 23,228    
With allowance assigned to the loan and lease balances 21,017 23,228    
With no allowance assigned to the loan and lease balances 0 0    
ALLL on impaired loans 2,602 3,846    
CRE        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 91,893 83,952    
Attributable to loans individually evaluated for impairment 8,114 18,887    
Total ALLL balance: 100,007 102,839 162,557 285,369
Collectively evaluated for impairment 5,109,916 4,941,770    
Individually evaluated for impairment 144,977 217,262    
Total loans and leases evaluated for impairment 5,268,651 5,197,403    
With allowance assigned to the loan and lease balances 90,475 144,162    
With no allowance assigned to the loan and lease balances 68,260 111,471    
Total 158,735 255,633    
Average balance of impaired loans 202,192 511,590    
ALLL on impaired loans 8,114 18,887    
CRE | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 0 0    
Collectively evaluated for impairment 13,758 38,371    
Total loans and leases evaluated for impairment 13,758 38,371    
With allowance assigned to the loan and lease balances 0 0    
With no allowance assigned to the loan and lease balances 13,758 38,371    
ALLL on impaired loans 0 0    
Automobile        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 47,725 31,935    
Attributable to loans individually evaluated for impairment 1,779 1,531    
Total ALLL balance: 49,504 33,466 31,053 34,979
Collectively evaluated for impairment 9,449,374 8,659,290    
Individually evaluated for impairment 31,304 30,612    
Total loans and leases evaluated for impairment 9,480,678 8,689,902    
With allowance assigned to the loan and lease balances 31,304 30,612    
With no allowance assigned to the loan and lease balances 0 0    
Total 31,304 30,612    
Average balance of impaired loans 30,163 34,637    
ALLL on impaired loans 1,779 1,531    
Automobile | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 0 0    
Collectively evaluated for impairment 0 0    
Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 67,429 70,386    
Attributable to loans individually evaluated for impairment 16,242 26,027    
Total ALLL balance: 83,671 96,413 111,131 118,764
Collectively evaluated for impairment 8,221,643 8,180,469    
Individually evaluated for impairment 248,839 310,446    
Total loans and leases evaluated for impairment 8,470,482 8,490,915    
With allowance assigned to the loan and lease balances 248,839 310,446    
With no allowance assigned to the loan and lease balances 0 0    
Total 248,839 310,446    
Average balance of impaired loans 292,014 258,881    
ALLL on impaired loans 16,242 26,027    
Home Equity | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 0 0    
Collectively evaluated for impairment 0 0    
Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 24,708 30,668    
Attributable to loans individually evaluated for impairment 16,811 16,535    
Total ALLL balance: 41,646 47,211 39,577 61,658
Collectively evaluated for impairment 5,629,951 5,459,120    
Individually evaluated for impairment 366,995 369,577    
Total loans and leases evaluated for impairment 5,998,400 5,830,609    
With allowance assigned to the loan and lease balances 368,449 371,489    
With no allowance assigned to the loan and lease balances 0 0    
Total 368,449 371,489    
Average balance of impaired loans 373,573 384,026    
ALLL on impaired loans 16,938 16,543    
Residential Mortgage | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 127 8    
Collectively evaluated for impairment 1,454 1,912    
Total loans and leases evaluated for impairment 1,454 1,912    
With allowance assigned to the loan and lease balances 1,454 1,912    
With no allowance assigned to the loan and lease balances   0    
ALLL on impaired loans 127 8    
Other Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 24,093 37,813    
Attributable to loans individually evaluated for impairment 176 214    
Total ALLL balance: 24,269 38,272 $ 37,751 $ 27,254
Collectively evaluated for impairment 558,362 409,612    
Individually evaluated for impairment 4,640 4,088    
Total loans and leases evaluated for impairment 563,054 413,751    
With allowance assigned to the loan and lease balances 4,640 4,139    
With no allowance assigned to the loan and lease balances 52 0    
Total 4,692 4,139    
Average balance of impaired loans 4,726 2,879    
ALLL on impaired loans 176 459    
Other Consumer | Purchase credit-impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Attributable to loans collectively evaluated for impairment 0 245    
Collectively evaluated for impairment 52 51    
Total loans and leases evaluated for impairment 52 51    
With allowance assigned to the loan and lease balances 0 51    
With no allowance assigned to the loan and lease balances 52 0    
ALLL on impaired loans $ 0 $ 245    
[1] Amounts represent loans for which Huntington has elected the fair value option.