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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period $ (3,755)    
Total other comprehensive income (loss) 5,283 $ 2,344 $ (437)
Balance at end of period 1,528 (3,755)  
Unrealized Gain (Loss) on Securities      
Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (23) (3,455)  
Other comprehensive income, before reclassifications 4,315 4,304  
Amounts reclassified from accumulated other comprehensive income (loss) (41) 40  
Current period other comprehensive income, before tax 4,274 4,344  
Income tax benefit (expense) (898) (912)  
Total other comprehensive income (loss) 3,376 3,432  
Balance at end of period 3,353 (23) (3,455)
Unrecognized Net Pension and Postretirement Costs      
Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (3,732) (2,644)  
Other comprehensive income, before reclassifications 214 79  
Amounts reclassified from accumulated other comprehensive income (loss) 2,200 (1,455)  
Current period other comprehensive income, before tax 2,414 (1,376)  
Income tax benefit (expense) (507) 288  
Total other comprehensive income (loss) 1,907 (1,088)  
Balance at end of period (1,825) (3,732) (2,644)
Accumulated Other Comprehensive (Loss) Income      
Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (3,755) (6,099)  
Other comprehensive income, before reclassifications 4,529 4,383  
Amounts reclassified from accumulated other comprehensive income (loss) 2,159 (1,415)  
Current period other comprehensive income, before tax 6,688 2,968  
Income tax benefit (expense) (1,405) (624)  
Total other comprehensive income (loss) 5,283 2,344 (437)
Balance at end of period $ 1,528 $ (3,755) $ (6,099)