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Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 336,613 $ 324,212 $ 330,126 $ 298,898
Total other comprehensive income 733 3,058 7,513 13,119
Ending balance 342,055 329,263 342,055 329,263
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 19,549 12,176 12,883 2,347
Other comprehensive income before reclassifications 749 2,944 7,415 12,784
Amounts reclassified from accumulated other comprehensive income (loss) (73) (2) (73) (13)
Total other comprehensive income 676 2,942 7,342 12,771
Ending balance 20,225 15,118 20,225 15,118
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (5,895) (3,567) (6,009) (3,799)
Amounts reclassified from accumulated other comprehensive income (loss) 57 116 171 348
Total other comprehensive income 57 116 171 348
Ending balance (5,838) (3,451) (5,838) (3,451)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 13,654 8,609 6,874 (1,452)
Other comprehensive income before reclassifications 749 2,944 7,415 12,784
Amounts reclassified from accumulated other comprehensive income (loss) (16) 114 98 335
Total other comprehensive income 733 3,058 7,513 13,119
Ending balance $ 14,387 $ 11,667 $ 14,387 $ 11,667