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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Before-Tax Amount
Net unrealized gains/losses	$ 16,181	$ (19,054)
Tax (Expense) Benefit
Net unrealized gains/losses	(3,966)	4,668
Net of Tax
Other comprehensive income (loss)	12,215	(14,386)
Net unrealized gains/losses
Before-Tax Amount
Change in net unrealized gain/loss during the period	15,756	(19,351)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	0	(124)
Net unrealized gains/losses	15,756	(19,475)
Tax (Expense) Benefit
Change in net unrealized gain/loss during the period	(3,862)	4,741
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	0	30
Net unrealized gains/losses	(3,862)	4,771
Net of Tax
Change in net unrealized gain/loss during the period	11,894	(14,610)
Net of tax	0	(94)
Other comprehensive income (loss)	11,894	(14,704)
Amortization of net retirement plan actuarial gain
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	421	417
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(103)	(102)
Net of Tax
Net of tax	318	315
Amortization of net retirement plan prior service cost
Before-Tax Amount
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income	4	4
Tax (Expense) Benefit
Reclassification adjustment for net realized gain on sale included in available-for-sale securities	(1)	(1)
Net of Tax
Net of tax	3	3
Employee benefit plans
Before-Tax Amount
Net unrealized gains/losses	425	421
Tax (Expense) Benefit
Net unrealized gains/losses	(104)	(103)
Net of Tax
Other comprehensive income (loss)	$ 321	$ 318

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