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Accumulated Other Comprehensive Income (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net securities gains (losses)	$ 16	$ 2	$ 12	$ 2
Income tax expense	(3,204)	(4,346)	(5,421)	(6,285)
Unrealized gain (loss) on securities, net of tax	12,569	15,261	22,251	24,214
Change in funded status of post retirement benefits	304	281	607	(2,302)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized gain (loss) on securities, net of tax	(292)	(279)	(598)	(560)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net securities gains (losses)	16	2	12	2
Income tax expense	(4)	0	(3)	0
Unrealized gain (loss) on securities, net of tax	12	2	9	2
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax expense	86	81	172	161
Unrealized gain (loss) on securities, net of tax	(304)	(281)	(607)	(562)
Change in funded status of post retirement benefits	$ (390)	$ (362)	$ (779)	$ (723)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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