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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (34,615) $ (12,772) $ (43,058) $ 6,404
Other comprehensive income (loss) before reclassification, before tax (3,704) (26,805) 6,170 (79,413)
Amounts reclassified from accumulated other comprehensive income, before tax 587 9,317 1,193 38,081
Other comprehensive income (loss), before tax (3,117) (17,488) 7,363 (41,332)
Income tax (expense) benefit 561 3,635 (1,476) 8,303
Ending balance, net of tax (37,171) (26,625) (37,171) (26,625)
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (34,314) (12,769) (42,958) 6,519
Other comprehensive income (loss) before reclassification, before tax (3,757) (26,518) 6,371 (79,267)
Amounts reclassified from accumulated other comprehensive income, before tax 587 9,317 1,193 38,081
Other comprehensive income (loss), before tax (3,170) (17,201) 7,564 (41,186)
Income tax (expense) benefit 572 3,575 (1,518) 8,272
Ending balance, net of tax (36,912) (26,395) (36,912) (26,395)
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (301) (3) (100) (115)
Other comprehensive income (loss) before reclassification, before tax 53 (287) (201) (146)
Amounts reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Other comprehensive income (loss), before tax 53 (287) (201) (146)
Income tax (expense) benefit (11) 60 42 31
Ending balance, net of tax $ (259) $ (230) $ (259) $ (230)