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Provision for income taxes - Provision for income taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Provision for income taxes        
Total provision for income taxes $ 1,287 $ 1,906 $ 3,206 $ 3,442
Expected tax expense, at the U.S. federal statutory income tax rate of 21% 1,126 1,697 2,803 3,066
State income taxes 161 243 401 439
FDII benefit (16) (39) (40) (72)
Other, net 16 5 42 9
Total provision for income taxes 1,287 1,906 3,206 3,442
Disclosure Other Comprehensive Income Loss Tax Effects Allocation to Component Of Other Comprehensive Income Loss [Abstract]        
Net income 1,287 1,906 3,206 3,442
Other comprehensive loss - marketable securities (18)   (31)  
Total $ 1,269 $ 1,906 $ 3,175 $ 3,442