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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 127,528,000 $ 118,396,000
Balance 139,574,000 126,100,000
Unrealized Gains And Losses On Available-for-sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 185,000 (870,000)
Other comprehensive income before reclassification, net of tax 7,333,000 2,546,000
Amounts reclassified from accumulated other comprehensive income, net of tax (20,000) (201,000)
Current period other comprehensive income 7,353,000 2,345,000
Balance 7,538,000 1,475,000
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (6,171,000) (5,510,000)
Other comprehensive income before reclassification, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax
Current period other comprehensive income
Balance (6,171,000) (5,510,000)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (5,986,000) (6,380,000)
Other comprehensive income before reclassification, net of tax 7,333,000 2,546,000
Amounts reclassified from accumulated other comprehensive income, net of tax (20,000) (201,000)
Current period other comprehensive income 7,353,000 2,345,000
Balance $ 1,367,000 $ (4,035,000)