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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Federal tax expense at statutory rate $ 3,233 $ 3,502 $ 3,619 $ 8,027
Increase in income taxes resulting from:        
State tax, net of federal benefit 526 495 648 1,150
Section 162(m) limitation 216 74 290 147
Excess tax deficiencies from share-based awards 24   142 (43)
Other 158 34 152 (106)
Total $ 4,157 $ 4,105 $ 4,851 $ 9,175
Federal tax expense at statutory rate 21.00% 21.00% 21.00% 21.00%
Increase in income taxes resulting from:        
State tax, net of federal benefit 3.40% 3.00% 3.80% 3.00%
Section 162(m) limitation 1.40% 0.40% 1.70% 0.40%
Excess tax deficiencies from share-based awards 0.20% 0.00% 0.80% (0.10%)
Other 1.00% 0.20% 0.80% (0.30%)
Total 27.00% 24.60% 28.10% 24.00%