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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 689,149  
Balance $ 704,135 $ 686,726 704,135 $ 686,726
Unrealized Gains and Losses on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (4,512) (17,882) (10,205) (22,715)
Other comprehensive income before reclassification, before tax 524 11,912 7,644 17,841
Amounts reclassified from accumulated other comprehensive income (loss), before tax 27 801 48 833
Other comprehensive income, before tax 551 12,713 7,692 18,674
Income tax expense (109) (2,568) (1,557) (3,696)
Balance (4,070) (7,737) (4,070) (7,737)
Foreign Currency Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (145) (169) (205) (148)
Other comprehensive income before reclassification, before tax 20 74 95 47
Amounts reclassified from accumulated other comprehensive income (loss), before tax 0 0 0 0
Other comprehensive income, before tax 20 74 95 47
Income tax expense (5) (15) (20) (9)
Balance (130) (110) (130) (110)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (4,657) (18,051) (10,410) (22,863)
Other comprehensive income before reclassification, before tax 544 11,986 7,739 17,888
Amounts reclassified from accumulated other comprehensive income (loss), before tax 27 801 48 833
Other comprehensive income, before tax 571 12,787 7,787 18,721
Income tax expense (114) (2,583) (1,577) (3,705)
Balance $ (4,200) $ (7,847) $ (4,200) $ (7,847)