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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning $ 222,972 $ 212,366 $ 218,985 $ 150,271
Before reclassifications 829 (1,055) 5,482 (4,572)
Reclassifications 16 5 29 6
Balance ending 225,492 213,515 225,492 213,515
Total [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning (53) (6,383) (4,719) (2,867)
Balance ending 792 (7,433) 792 (7,433)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning   (6,220)   (2,698)
Before reclassifications 829 (1,058) 5,482 (4,581)
Reclassifications 16 5 29 6
Balance ending 880   880  
Changes in Pension Plan Assets and Benefit Obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning   (163)   (169)
Before reclassifications 0 3 0 9
Reclassifications 0 0 0 0
Balance ending (88)   (88)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Total [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning (53) (6,383) (4,719) (2,342)
Balance ending   (7,433)   (7,433)
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 35 (6,220) (4,631) (2,200)
Balance ending   (7,273)   (7,273)
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 $ (88) (163) $ (88) (142)
Balance ending   (160)   (160)
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]        
Cumulative effect of changes in accounting principles   0   (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]        
Cumulative effect of changes in accounting principles       (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]        
Cumulative effect of changes in accounting principles   0   (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]        
Cumulative effect of changes in accounting principles   $ 0   $ (27)