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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
(Loss) Income Before Income Taxes $ (3,535) $ 1,944
Tax benefit (expense) 2,408 (1,048)
Net (Loss) Income (1,127) 896
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
(Loss) Income Before Income Taxes (311) 35
Tax benefit (expense) 73 1
Net (Loss) Income (238) 36
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net investment gain (loss) (330) 178
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Other Income (Expense), Net [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Defined benefit plan adjustments - actuarial gain $ 19 $ (143)