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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 11,172 $ 9,759
Other comprehensive income:    
Changes in benefit obligations and plan assets for post retirement benefit plans, net of reclassification adjustments, net of deferred income tax of ($5) and $0 for the years ended December 31, 2020 and 2019, respectively (25)  
Unrealized gain (loss) on available for sale securities, net of reclassification adjustments, net of deferred income tax of $484 and $807 for the years ended December 31, 2020 and 2019, respectively 1,822 3,035
Total other comprehensive income 1,797 3,035
Total comprehensive income $ 12,969 $ 12,794