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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 32,192,000 $ 33,878,000 $ 14,139,000
Other comprehensive income (loss):      
Unrealized holding gains (loss) on available for sale securities 10,841,000 13,336,000 (709,000)
Tax effect (2,277,000) (2,800,000) 149,000
Pension liability adjustment (1,037,000) (2,797,000) 646,000
Tax effect 218,000 587,000 (136,000)
Total other comprehensive income (loss) 7,745,000 8,326,000 (50,000)
Comprehensive income $ 39,937,000 $ 42,204,000 $ 14,089,000