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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (18,051) $ (37,171) $ (22,863) $ (43,058)
Other comprehensive income (loss) before reclassification, before tax 11,986 (1,372) 17,888 4,797
Amounts reclassified from accumulated other comprehensive income, before tax 801 118 833 1,311
Other comprehensive income (loss), before tax 12,787 (1,254) 18,721 6,108
Income tax benefit (expense) (2,583) 308 (3,705) (1,167)
Ending balance, net of tax (7,847) (38,117) (7,847) (38,117)
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (17,882) (36,912) (22,715) (42,958)
Other comprehensive income (loss) before reclassification, before tax 11,912 (1,191) 17,841 5,179
Amounts reclassified from accumulated other comprehensive income, before tax 801 118 833 1,311
Other comprehensive income (loss), before tax 12,713 (1,073) 18,674 6,490
Income tax benefit (expense) (2,568) 270 (3,696) (1,247)
Ending balance, net of tax (7,737) (37,715) (7,737) (37,715)
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (169) (259) (148) (100)
Other comprehensive income (loss) before reclassification, before tax 74 (181) 47 (382)
Amounts reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Other comprehensive income (loss), before tax 74 (181) 47 (382)
Income tax benefit (expense) (15) 38 (9) 80
Ending balance, net of tax $ (110) $ (402) $ (110) $ (402)