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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income Loss (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]      
Other Comprehensive Income (Loss), Before Tax $ 9,804,000 $ 10,539,000 $ (415,000)
Other Comprehensive Income (Loss), Tax Effect 2,059,000 2,213,000 (87,000)
Other Comprehensive Income (Loss), Net of Tax 7,745,000 8,326,000 (328,000)
Net unrealized Gains (Losses) on Investment Securities [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Other comprehensive income (loss) before reclassifications, Before Tax 10,935,000 13,368,000 (1,122,000)
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax (94,000) (32,000) 413,000
Reclassification of equity securities from accumulated other comprehensive income (loss), Before Tax     (352,000)
Other Comprehensive Income (Loss), Before Tax 10,841,000 13,336,000 (1,061,000)
Other comprehensive income (loss) before reclassifications, Tax Effect 2,297,000 2,807,000 (236,000)
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect (20,000) (7,000) 87,000
Reclassification of equity securities from accumulated other comprehensive income (loss), Tax Effect     (74,000)
Other Comprehensive Income (Loss), Tax Effect 2,277,000 2,800,000 (223,000)
Other comprehensive income (loss) before reclassifications, Net of Tax 8,638,000 10,561,000 (886,000)
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax (74,000) (25,000) 326,000
Reclassification of equity securities from accumulated other comprehensive income (loss), Net of Tax     (278,000)
Other Comprehensive Income (Loss), Net of Tax 8,564,000 10,536,000 (838,000)
Defined Benefit Plans [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Other comprehensive income (loss) before reclassifications, Before Tax (1,326,000) (2,953,000) 497,000
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax 289,000 156,000 149,000
Other Comprehensive Income (Loss), Before Tax (1,037,000) (2,797,000) 646,000
Other comprehensive income (loss) before reclassifications, Tax Effect (279,000) (620,000) 104,000
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect 61,000 33,000 32,000
Other Comprehensive Income (Loss), Tax Effect (218,000) (587,000) 136,000
Other comprehensive income (loss) before reclassifications, Net of Tax (1,047,000) (2,333,000) 393,000
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax 228,000 123,000 117,000
Other Comprehensive Income (Loss), Net of Tax $ (819,000) $ (2,210,000) $ 510,000