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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning $ 224,018 $ 148,584 $ 218,985 $ 150,271
Before reclassifications 2,178 (541) 4,653 (3,517)
Reclassifications (1) 1 13 1
Balance ending 222,972 212,366 222,972 212,366
Total [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning (2,230) (5,843) (4,719) (2,867)
Balance ending (53) (6,383) (53) (6,383)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning   (5,677)   (2,698)
Before reclassifications 2,178 (544) 4,653 (3,523)
Reclassifications (1) 1 13 1
Balance ending 35   35  
Changes in Pension Plan Assets and Benefit Obligations [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance beginning   (166)   (169)
Before reclassifications 0 3 0 6
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 (2,230) (5,843) (4,719) (2,342)
Balance ending   (6,383)   (6,383)
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 (2,142) (5,677) (4,631) (2,200)
Balance ending   (6,220)   (6,220)
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) (166) $ (88) (142)
Balance ending   (163)   (163)
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)