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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 127,528 $ 118,396
Balance 145,176 127,528
Unrealized Gains And Losses On Available-for-sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 185 (870)
Other comprehensive income before reclassification, net of tax 9,769 1,257
Amounts reclassified from accumulated other comprehensive income, net of tax (23) (202)
Current period other comprehensive income 9,746 1,055
Balance 9,931 185
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (6,171) (5,510)
Other comprehensive income before reclassification, net of tax (1,284) (1,097)
Amounts reclassified from accumulated other comprehensive income, net of tax 714 436
Current period other comprehensive income (570) (661)
Balance (6,741) (6,171)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (5,986) (6,380)
Other comprehensive income before reclassification, net of tax 8,485 160
Amounts reclassified from accumulated other comprehensive income, net of tax 691 234
Current period other comprehensive income 9,176 394
Balance $ 3,190 $ (5,986)