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Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gain on investment	$ 188	$ 804	$ 629	$ 990
Unrecognized loss	0	(2)	0	(6)
Income before Income Taxes	12,560	8,917	26,599	23,714
Other Comprehensive Income (Loss), Tax	(131)	370	(537)	1,356
Tax	(1,927)	(2,990)	(4,873)	(7,647)
Net Income	10,633	5,927	21,726	16,067
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net Income	0	529	0	639
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 on investment	0	804	0	977
Other-than-temporary impairments	0	0	0	0
Income before Income Taxes	0	804	0	977
Tax	0	(274)	0	(334)
Net Income	0	530	0	643
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	0
Unrecognized loss	0	(2)	0	(6)
Income before Income Taxes	0	(2)	0	(6)
Tax	0	1	0	2
Net Income	$ 0	$ (1)	$ 0	$ (4)

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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