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Other Comprehensive Income (Loss) - Schedule of Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	$ 698,029	$ 657,677	$ 663,054	$ 620,871
Other comprehensive (loss) income	(2,816)	3,323	19,700	26,314
Balances at Ending	713,611	659,865	713,611	659,865
Available-for- Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	25,581	(1,223)	4,039	(23,589)
Other comprehensive (loss) income before reclassifications	(3,303)	3,111	18,563	25,681
Amounts reclassified from accumulated other comprehensive (loss) income	0	(101)	(324)	(305)
Other comprehensive (loss) income	(3,303)	3,010	18,239	25,376
Balances at Ending	22,278	1,787	22,278	1,787
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(46,629)	(38,951)	(47,603)	(39,576)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	487	313	1,461	938
Other comprehensive (loss) income	487	313	1,461	938
Balances at Ending	(46,142)	(38,638)	(46,142)	(38,638)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances at Beginning	(21,048)	(40,174)	(43,564)	(63,165)
Other comprehensive (loss) income before reclassifications	(3,303)	3,111	18,563	25,681
Amounts reclassified from accumulated other comprehensive (loss) income	487	212	1,137	633
Other comprehensive (loss) income	(2,816)	3,323	19,700	26,314
Balances at Ending	$ (23,864)	$ (36,851)	$ (23,864)	$ (36,851)

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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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