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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax $ 6,404 $ 34,308
Other comprehensive income (loss) before reclassification, before tax (101,237) (34,021)
Amounts reclassified from accumulated other comprehensive income (loss), before tax 39,610 (342)
Other comprehensive income (loss), before tax (61,627) (34,363)
Income tax benefit (expense) 12,165 6,459
Ending balance, net of tax (43,058) 6,404
Unrealized Gains and Losses on Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax 6,519 34,181
Other comprehensive income (loss) before reclassification, before tax (101,255) (33,715)
Amounts reclassified from accumulated other comprehensive income (loss), before tax 39,610 (342)
Other comprehensive income (loss), before tax (61,645) (34,057)
Income tax benefit (expense) 12,168 6,395
Ending balance, net of tax (42,958) 6,519
Foreign Currency Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (115) 127
Other comprehensive income (loss) before reclassification, before tax 18 (306)
Amounts reclassified from accumulated other comprehensive income (loss), before tax 0 0
Other comprehensive income (loss), before tax 18 (306)
Income tax benefit (expense) (3) 64
Ending balance, net of tax $ (100) $ (115)