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Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Before-Tax Amount
Net unrealized loss	$ (19,054)	$ 2,375
Tax (Expense) Benefit
Net unrealized loss	4,668	(950)
Net of Tax
Net current-period other comprehensive income	(14,386)	1,425
Available-for-sale securities:
Before-Tax Amount
Change in net unrealized gain/loss during the period	(19,351)	1,995
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	(124)	0
Net unrealized loss	(19,475)	1,995
Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	4,741	(798)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	30	0
Net unrealized loss	4,771	(798)
Net of Tax
Change in net unrealized gain/loss during the period	(14,610)	1,197
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(94)	0
Net current-period other comprehensive income	(14,704)	1,197
Plan actuarial loss
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	417	357
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(102)	(143)
Net of Tax
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	315	214
Net retirement plan prior service (cost) credit
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	4	23
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(1)	(9)
Net of Tax
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	3	14
Employee benefit plans
Before-Tax Amount
Net unrealized loss	421	380
Tax (Expense) Benefit
Net unrealized loss	(103)	(152)
Net of Tax
Net current-period other comprehensive income	$ 318	$ 228

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