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Regulatory Matters - Capital Ratios and Amounts of Company and its Banking Subsidiaries (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Ratio 4.50%  
Ratio 6.00%  
Ratio 8.00%  
M&T (Consolidated) [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Amount $ 10,485,426  
Ratio 11.08%  
Minimum required amount $ 4,259,977  
Amount $ 12,008,232 $ 9,644,765
Ratio 12.68% 12.47%
Minimum required amount $ 5,679,969 $ 3,093,874
Amount $ 14,128,454 $ 11,767,308
Ratio 14.92% 15.21%
Minimum required amount $ 7,573,292 $ 6,187,747
Amount $ 12,008,232 $ 9,644,765
Ratio 10.89% 10.17%
Minimum required amount $ 4,408,971 $ 3,793,836
M&T Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Amount $ 10,680,827  
Ratio 11.33%  
Minimum required amount $ 4,242,817  
Amount $ 10,680,827 $ 8,043,185
Ratio 11.33% 10.46%
Minimum required amount $ 5,657,089 $ 3,077,101
Amount $ 12,589,917 $ 10,048,277
Ratio 13.35% 13.06%
Minimum required amount $ 7,542,786 $ 6,154,201
Amount $ 10,680,827 $ 8,043,185
Ratio 9.75% 8.56%
Minimum required amount $ 4,381,617 $ 3,760,364
Wilmington Trust, N.A. [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Amount $ 476,106  
Ratio 86.87%  
Minimum required amount $ 24,664  
Amount $ 476,106 $ 435,558
Ratio 86.87% 57.22%
Minimum required amount $ 32,886 $ 30,447
Amount $ 480,415 $ 439,867
Ratio 87.65% 57.79%
Minimum required amount $ 43,848 $ 60,893
Amount $ 476,106 $ 435,558
Ratio 22.38% 9.98%
Minimum required amount $ 85,082 $ 174,613