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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
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 334,835 $ 355,212
Total other comprehensive income (loss) 8,135 (29,509)
Ending balance 347,697 327,692
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (52,771) 14,675
Other comprehensive income (loss) before reclassifications 8,135 (29,564)
Amounts reclassified from accumulated other comprehensive loss 0 0
Total other comprehensive income (loss) 8,135 (29,564)
Ending balance (44,636) (14,889)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (5,274) (5,855)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 0 55
Total other comprehensive income (loss) 0 55
Ending balance (5,274) (5,800)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (58,045) 8,820
Other comprehensive income (loss) before reclassifications 8,135 (29,564)
Amounts reclassified from accumulated other comprehensive loss 0 55
Total other comprehensive income (loss) 8,135 (29,509)
Ending balance $ (49,910) $ (20,689)