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Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:                      
Federal                 $ 7,536 $ 6,289 $ 4,005
State                 271 513 63
Total current                 7,807 6,802 4,068
Deferred:                      
Federal                 (1,746) (1,596) 227
State                 (59) (95) 65
Total deferred                 (1,805) (1,691) 292
Total Income Tax $ 1,999 $ 1,624 $ 1,319 $ 1,060 $ 1,691 $ 1,287 $ 1,161 $ 972 $ 6,002 $ 5,111 $ 4,360