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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ 37,693 $ 16,542 $ 17,609 $ (21,231)
Other comprehensive income (loss) before reclassification, before tax 2,308 10,967 39,218 56,291
Amounts reclassified from accumulated other comprehensive income, before tax (2,276) (946) (17,028) (2,834)
Other comprehensive income (loss), before tax 32 10,021 22,190 53,457
Income tax (expense) benefit (2,005) (1,249) (4,079) (6,912)
Ending balance, net of tax 35,720 25,314 35,720 25,314
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax 38,736 17,745 18,641 (19,897)
Other comprehensive income (loss) before reclassification, before tax 1,852 10,767 38,773 55,960
Amounts reclassified from accumulated other comprehensive income, before tax (2,276) (946) (17,028) (2,834)
Other comprehensive income (loss), before tax (424) 9,821 21,745 53,126
Income tax (expense) benefit (2,128) (1,249) (4,202) (6,912)
Ending balance, net of tax 36,184 26,317 36,184 26,317
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (1,043) (1,203) (1,032) (1,334)
Other comprehensive income (loss) before reclassification, before tax 456 200 445 331
Amounts reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Other comprehensive income (loss), before tax 456 200 445 331
Income tax (expense) benefit 123 0 123 0
Ending balance, net of tax $ (464) $ (1,003) $ (464) $ (1,003)