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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     $ 1,528  
Total other comprehensive income (loss) $ (2,213) $ 251 (3,100) $ 3,402
Balance at end of period (1,572)   (1,572)  
Unrealized Gain (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     3,353 (23)
Other comprehensive income (loss), before reclassifications     (4,104) 4,165
Amounts reclassified from accumulated other comprehensive income (loss)     (95) (19)
Current period other comprehensive income (loss), before tax     (4,199) 4,146
Income tax benefit (expense)     882 (871)
Total other comprehensive income (loss)     (3,317) 3,275
Balance at end of period 36 3,252 36 3,252
Unrecognized Net Pension and Postretirement Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (1,825) (3,732)
Other comprehensive income (loss), before reclassifications     275 160
Current period other comprehensive income (loss), before tax     275 160
Income tax benefit (expense)     (58) (33)
Total other comprehensive income (loss)     217 127
Balance at end of period (1,608) (3,605) (1,608) (3,605)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     1,528 (3,755)
Other comprehensive income (loss), before reclassifications     (3,829) 4,325
Amounts reclassified from accumulated other comprehensive income (loss)     (95) (19)
Current period other comprehensive income (loss), before tax     (3,924) 4,306
Income tax benefit (expense)     824 (904)
Total other comprehensive income (loss) (2,213) 251 (3,100) 3,402
Balance at end of period $ (1,572) $ (353) $ (1,572) $ (353)