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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning $ 150,271 $ 142,944
Before reclassifications (2,976) 427
Reclassifications 0 (152)
Balance ending 148,584 150,271
Total [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (2,867) (2,617)
Balance ending (5,843) (2,867)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (2,698) (2,633)
Before reclassifications (2,979) 585
Reclassifications 0 (152)
Balance ending (5,677) (2,698)
Changes in Pension Plan Assets and Benefit Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (169) 16
Before reclassifications 3 (158)
Reclassifications 0 0
Balance ending (166) (169)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning 150,271  
Balance ending   150,271
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Total [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (2,342)  
Balance ending   (2,342)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (2,200)  
Balance ending   (2,200)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance beginning (142)  
Balance ending   $ (142)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI (525)  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Total [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI (525)  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI (498)  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI $ (27)