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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax $ (22,863) $ (43,058)
Other comprehensive income (loss) before reclassification, before tax 3,522 9,874
Amounts reclassified from accumulated other comprehensive income, before tax 25 606
Other comprehensive income (loss), before tax 3,547 10,480
Income tax benefit (expense) (679) (2,037)
Ending balance, net of tax (19,995) (34,615)
Unrealized Gains and Losses on Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (22,715) (42,958)
Other comprehensive income (loss) before reclassification, before tax 3,608 10,128
Amounts reclassified from accumulated other comprehensive income, before tax 25 606
Other comprehensive income (loss), before tax 3,633 10,734
Income tax benefit (expense) (697) (2,090)
Ending balance, net of tax (19,779) (34,314)
Foreign Currency Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (148) (100)
Other comprehensive income (loss) before reclassification, before tax (86) (254)
Amounts reclassified from accumulated other comprehensive income, before tax 0 0
Other comprehensive income (loss), before tax (86) (254)
Income tax benefit (expense) 18 53
Ending balance, net of tax $ (216) $ (301)