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Other Comprehensive Income (Loss) (Schedule of Other Comprehensive Income Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 624,709	$ 573,820	$ 458,640
Other Comprehensive Income (Loss) Before Reclassification	(18,116)	23,494
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1,775)	(3,224)
Comprehensive Income (Loss)	(19,891)	20,270	22,203
Ending Balance	668,459	624,709	573,820
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	35,943	15,673
Other Comprehensive Income (Loss) Before Reclassification	(18,116)	23,494
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1,775)	(3,224)
Comprehensive Income (Loss)	(19,891)	20,270
Ending Balance	16,052	35,943	15,673
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(568)	(568)
Other Comprehensive Income (Loss) Before Reclassification	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Comprehensive Income (Loss)	0	0
Ending Balance	(568)	(568)	(568)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	35,375	15,105	(7,098)
Comprehensive Income (Loss)	(19,891)	20,270	22,203
Ending Balance	$ 15,484	$ 35,375	$ 15,105

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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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