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Other Comprehensive Income (Loss) - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net gain (loss) on sale of securities                 $ 94,000 $ 32,000 $ (413,000)
Other operating expenses                 (9,096,000) (9,288,000) (7,335,000)
Income tax expense                 (4,940,000) (5,683,000) (2,640,000)
Net income $ 10,173,000 $ 7,682,000 $ 6,504,000 $ 7,833,000 $ 7,841,000 $ 7,708,000 $ 8,660,000 $ 9,669,000 32,192,000 33,878,000 14,139,000
Reclassification out of Accumulated Other Comprehensive Loss [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income                 (154,000) (98,000) (443,000)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net gain (loss) on sale of securities                 94,000 32,000 (413,000)
Income tax expense                 (20,000) (7,000) 87,000
Net income                 74,000 25,000 (326,000)
Accumulated Defined Benefit Plans Adjustment, Actuarial Losses [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other operating expenses                 (289,000) (156,000) (149,000)
Income tax expense                 61,000 33,000 32,000
Net income                 $ (228,000) $ (123,000) $ (117,000)