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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Unrealized gains (losses) arising during the period on available for sale securities, tax	$ (259)	$ 589	$ (1,954)
Reclassification adjustment for net gain on sales of available for sale securities included in net income, tax	(29)	(14)	(356)
Change in defined benefit plans, tax	361	3	(93)
Reclassification adjustment for settlement gains on benefit plans, tax	$ (155)	$ 0	$ 0
Income tax impacts of the components of other comprehensive income	21.00%	34.00%	34.00%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount, before reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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