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Accumulated Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 129,011    
Change in accounting policy - ASU 2016-01     $ 1
Other comprehensive income (loss) before reclassifications (net of tax) (1,617) $ 46  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 37 (75)  
Other comprehensive loss, net of tax (1,580) (29)  
Ending Balance 129,850    
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (3,398) (1,392)  
Ending Balance (4,977) (1,421)  
Unrealized Gain (Loss) on Available for Sale Securities [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (269) 1,306  
Change in accounting policy - ASU 2016-01     1
Other comprehensive income (loss) before reclassifications (net of tax) (1,617) 46  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 0 (114)  
Other comprehensive loss, net of tax (1,617) (68)  
Ending Balance (1,885) 1,238  
Defined Benefit Pension Items [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (3,129) (2,698)  
Change in accounting policy - ASU 2016-01     $ 0
Other comprehensive income (loss) before reclassifications (net of tax) 0 0  
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 37 39  
Other comprehensive loss, net of tax 37 39  
Ending Balance $ (3,092) $ (2,659)