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Earnings Per Share - Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income available to common shareholders $ 4,090,053 $ 4,360,109 $ 13,581,550 $ 11,726,282
Denominator:        
Weighted average common shares outstanding 7,007 6,872 6,972 6,824
Effect of dilutive securities:        
Weighted average common shares outstanding - assuming dilution 7,281 7,124 7,241 7,088
Basic earnings per common share $ 0.58 $ 0.63 $ 1.95 $ 1.72
Diluted earnings per common share $ 0.56 $ 0.61 $ 1.88 $ 1.65
Restricted Stock [Member]        
Effect of dilutive securities:        
Restricted stock / Stock options 3 4 3 4
Stock Options [Member]        
Effect of dilutive securities:        
Restricted stock / Stock options 271 248 266 260