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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net realized gain (loss) on investment $ (110) $ 1,041 $ 768
Prior year service cost 0 0  
Unrecognized loss 0 (9) (9)
Income before Income Taxes 27,069 30,271 28,131
Tax (5,210) (4,570) (8,616)
Net income 21,859 25,701 19,515
Reclassification Out Of Accumulated Other Comprehensive Income      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net income (93) 784 480
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains And Losses On Available-For-Sale Securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net realized gain (loss) on investment (117) 1,227 973
Other-than-temporary impairments 0 (26) (234)
Income before Income Taxes (117) 1,201 739
Tax 24 (411) (254)
Net income (93) 790 485
Reclassification Out Of Accumulated Other Comprehensive Income | Postretirement Benefits Plans      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Prior year service cost 0 0 0
Unrecognized loss 0 (9) (9)
Income before Income Taxes [1] 0 (9) (9)
Tax 0 3 4
Net income $ 0 $ (6) $ (5)
[1] These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within salaries, employee benefits and payroll taxes on the Consolidated Statements of Income as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 10.