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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	$ 717,689	$ 663,054
Other comprehensive (loss) income	(24,876)	22,293
Balances at Ending	709,936	682,597
Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	20,609	4,039
Other comprehensive (loss) income before reclassifications	(25,246)	22,123
Amounts reclassified from accumulated other comprehensive (loss) income	(249)	(324)
Other comprehensive (loss) income	(25,495)	21,799
Balances at Ending	(4,886)	25,838
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(52,683)	(47,603)
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	619	494
Other comprehensive (loss) income	619	494
Balances at Ending	(52,064)	(47,109)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(32,074)	(43,564)
Other comprehensive (loss) income before reclassifications	(25,246)	22,123
Amounts reclassified from accumulated other comprehensive (loss) income	370	170
Other comprehensive (loss) income	(24,876)	22,293
Balances at Ending	$ (56,950)	$ (21,271)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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