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Accumulated Comprehensive Loss, By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance $ 142,845 $ 129,850 $ 139,229 $ 129,011  
Change in Accounting policy for equity securities         $ 0
Other comprehensive income (loss) before reclassifications (net of tax) 2,440 (417) 3,488 (2,034)  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 48 37 96 74  
Other comprehensive income (loss), net of tax 2,488 (380) 3,584 (1,960)  
Balance 148,021 132,281 148,021 132,281  
Accumulated Other Comprehensive Loss [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance (2,825) (4,977) (3,921) (3,398)  
Change in Accounting policy for equity securities         1
Other comprehensive income (loss), net of tax 2,488 (380) 3,584 (1,960)  
Balance (337) (5,357) (337) (5,357)  
Unrealized Gain (Loss) on Available for Sale Securities [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance [1] 75 (1,885) (973) (269)  
Change in Accounting policy for equity securities         1
Other comprehensive income (loss) before reclassifications (net of tax) [1] 2,440 (417) 3,488 (2,034)  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) [1] 0 0 0 0  
Other comprehensive income (loss), net of tax [1] 2,440 (417) 3,488 (2,034)  
Balance [1] 2,515 (2,302) 2,515 (2,302)  
Defined Benefit Pension Items [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance [1] (2,900) (3,092) (2,948) (3,129)  
Change in Accounting policy for equity securities         $ 0
Other comprehensive income (loss) before reclassifications (net of tax) [1] 0 0 0 0  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) [1] 48 37 96 74  
Other comprehensive income (loss), net of tax [1] 48 37 96 74  
Balance [1] $ (2,852) $ (3,055) $ (2,852) $ (3,055)  
[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheet.