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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (37,171) $ (26,625) $ (43,058) $ 6,404
Other comprehensive loss before reclassification, before tax (1,373) (23,296) 4,797 (102,709)
Amounts reclassified from accumulated other comprehensive income, before tax 118 259 1,311 38,340
Other comprehensive income (loss), before tax (1,255) (23,037) 6,108 (64,369)
Income tax (expense) benefit 309 4,325 (1,167) 12,628
Ending balance, net of tax (38,117) (45,337) (38,117) (45,337)
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (36,912) (26,395) (42,958) 6,519
Other comprehensive loss before reclassification, before tax (1,192) (23,133) 5,179 (102,400)
Amounts reclassified from accumulated other comprehensive income, before tax 118 259 1,311 38,340
Other comprehensive income (loss), before tax (1,074) (22,874) 6,490 (64,060)
Income tax (expense) benefit 271 4,291 (1,247) 12,563
Ending balance, net of tax (37,715) (44,978) (37,715) (44,978)
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (259) (230) (100) (115)
Other comprehensive loss before reclassification, before tax (181) (163) (382) (309)
Amounts reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Other comprehensive income (loss), before tax (181) (163) (382) (309)
Income tax (expense) benefit 38 34 80 65
Ending balance, net of tax $ (402) $ (359) $ (402) $ (359)