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Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Before-Tax Amount
Other Comprehensive Income, Net unrealized losses	$ (10,176)	$ (11,647)	$ 1,844
Tax (Expense) Benefit
Other Comprehensive Income, Net unrealized losses	4,068	4,657	(736)
Net of Tax
Other comprehensive (loss) income	(6,108)	(6,990)	1,108
Available-for-sale securities:
Before-Tax Amount
Change in net unrealized gains (losses) during the period	(7,689)	(8,241)	19,094
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(926)	(1,108)	(391)
Other Comprehensive Income, Net unrealized losses	(8,615)	(9,349)	18,703
Tax (Expense) Benefit
Change in net unrealized losses during the period	3,074	3,295	(7,635)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(370)	(443)	(156)
Other Comprehensive Income, Net unrealized losses	3,444	3,738	(7,479)
Net of Tax
Change in net unrealized losses during the period	(4,615)	(4,946)	11,459
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(556)	(665)	(235)
Other comprehensive (loss) income	(5,171)	(5,611)	11,224
Plan actuarial loss
Before-Tax Amount
Change in net unrealized gains (losses) during the period	(2,787)	1,846	(24,211)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(1,338)	2,218	1,065
Tax (Expense) Benefit
Change in net unrealized losses during the period	1,114	(738)	9,684
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(535)	887	426
Net of Tax
Change in net unrealized losses during the period	(1,673)	1,108	(14,527)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(803)	1,331	639
Net retirement plan prior service (cost) credit
Before-Tax Amount
Change in net unrealized gains (losses) during the period	(188)		6,282
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	76	(6,362)	5
Tax (Expense) Benefit
Change in net unrealized losses during the period	75		(2,513)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	30	(2,544)	2
Net of Tax
Change in net unrealized losses during the period	(113)		3,769
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	46	(3,818)	3
Employee benefit plans
Before-Tax Amount
Other Comprehensive Income, Net unrealized losses	(1,561)	(2,298)	(16,859)
Tax (Expense) Benefit
Other Comprehensive Income, Net unrealized losses	624	919	6,743
Net of Tax
Other comprehensive (loss) income	$ (937)	$ (1,379)	$ (10,116)

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