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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax $ (43,058) $ 6,404
Other comprehensive income (loss) before reclassification, before tax 9,874 (52,608)
Amounts reclassified from accumulated other comprehensive income, before tax 606 28,764
Other comprehensive income (loss), before tax 10,480 (23,844)
Income tax benefit (2,037) 4,668
Ending balance, net of tax (34,615) (12,772)
Unrealized Gains and Losses on Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (42,958) 6,519
Other comprehensive income (loss) before reclassification, before tax 10,128 (52,749)
Amounts reclassified from accumulated other comprehensive income, before tax 606 28,764
Other comprehensive income (loss), before tax 10,734 (23,985)
Income tax benefit (2,090) 4,697
Ending balance, net of tax (34,314) (12,769)
Foreign Currency Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, net of tax (100) (115)
Other comprehensive income (loss) before reclassification, before tax (254) 141
Amounts reclassified from accumulated other comprehensive income, before tax 0 0
Other comprehensive income (loss), before tax (254) 141
Income tax benefit 53 (29)
Ending balance, net of tax $ (301) $ (3)