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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (19,995) $ (34,615) $ (22,863) $ (43,058)
Other comprehensive income (loss) before reclassification, before tax 2,380 (3,704) 5,902 6,170
Amounts reclassified from accumulated other comprehensive income, before tax 7 587 32 1,193
Other comprehensive income (loss), before tax 2,387 (3,117) 5,934 7,363
Income tax benefit (expense) (443) 561 (1,122) (1,476)
Ending balance, net of tax (18,051) (37,171) (18,051) (37,171)
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (19,779) (34,314) (22,715) (42,958)
Other comprehensive income (loss) before reclassification, before tax 2,321 (3,757) 5,929 6,371
Amounts reclassified from accumulated other comprehensive income, before tax 7 587 32 1,193
Other comprehensive income (loss), before tax 2,328 (3,170) 5,961 7,564
Income tax benefit (expense) (431) 572 (1,128) (1,518)
Ending balance, net of tax (17,882) (36,912) (17,882) (36,912)
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (216) (301) (148) (100)
Other comprehensive income (loss) before reclassification, before tax 59 53 (27) (201)
Amounts reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Other comprehensive income (loss), before tax 59 53 (27) (201)
Income tax benefit (expense) (12) (11) 6 42
Ending balance, net of tax $ (169) $ (259) $ (169) $ (259)