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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, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Income Before Income Taxes $ 4,291   $ 6,213   $ 756 $ 8,157
Tax benefit (expense) (2,148)   (1,127)   260 (2,175)
Net Income 2,143 $ (1,127) 5,086 $ 896 1,016 5,982
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]            
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]            
Income Before Income Taxes (386)   (540)   (697) (506)
Tax benefit (expense) 84   151   157 153
Net Income (302)   (389)   (540) (353)
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) (512)   (233)   (842) (55)
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 $ 126   $ (307)   $ 145 $ (451)