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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Income (Loss) Before Income Taxes $ 6,213   $ 2,387   $ 8,157 $ (11,950)
Tax benefit (expense) (1,127)   (1,635)   (2,175) 2,733
Net Income (Loss) 5,086 $ 896 752 $ (9,969) 5,982 (9,217)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]            
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Income (Loss) Before Income Taxes (540)   409   (506) (1,211)
Tax benefit (expense) 151   (92)   153 339
Net Income (Loss) (389)   317   (353) (872)
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) (233)   686   (55) (730)
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 losses $ (307)   $ (277)   $ (451) $ (481)