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Accumulated Other Comprehensive Loss - Changes in Each Component of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 347,697 $ 327,692 $ 334,835 $ 355,212
Total other comprehensive income (loss) (5,860) (25,553) 2,275 (55,062)
Ending balance 349,876 302,062 349,876 302,062
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (44,636) (14,889) (52,771) 14,675
Other comprehensive income (loss) before reclassifications (5,860) (25,603) 2,275 (55,167)
Amounts reclassified from accumulated other comprehensive income (loss) 0 (5) 0 (5)
Total other comprehensive income (loss) (5,860) (25,608) 2,275 (55,172)
Ending balance (50,496) (40,497) (50,496) (40,497)
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (5,274) (5,800) (5,274) (5,855)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 55 0 110
Total other comprehensive income (loss) 0 55 0 110
Ending balance (5,274) (5,745) (5,274) (5,745)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (49,910) (20,689) (58,045) 8,820
Other comprehensive income (loss) before reclassifications (5,860) (25,603) 2,275 (55,167)
Amounts reclassified from accumulated other comprehensive income (loss) 0 50 0 105
Total other comprehensive income (loss) (5,860) (25,553) 2,275 (55,062)
Ending balance $ (55,770) $ (46,242) $ (55,770) $ (46,242)