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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Unrealized (losses) gains arising during the period on available for sale securities, tax	$ (157)	$ (1)	$ (730)	$ 956
Reclassification adjustment for net gain on sales of available for sale securities included in net income, tax	(6)	(7)	(28)	(14)
Change in defined benefit plans, tax	66	(2)	423	(2)
Reclassification adjustment for settlement gains on benefit plans, tax	$ (25)	$ 0	$ (104)	$ 0

X

- Definition

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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