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Other Comprehensive Income (Loss) (Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 573,820	$ 458,640
Other Comprehensive Income (Loss) Before Reclassification	13,718	9,536
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(463)	(122)
Net Current Period Other Comprehensive Income (Loss)	13,255	9,414
Ending Balance	583,540	479,187
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	15,673	(6,759)
Other Comprehensive Income (Loss) Before Reclassification	13,718	9,536
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(463)	(122)
Net Current Period Other Comprehensive Income (Loss)	13,255	9,414
Ending Balance	28,928	2,655
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(568)	(339)
Other Comprehensive Income (Loss) Before Reclassification	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Net Current Period Other Comprehensive Income (Loss)	0	0
Ending Balance	(568)	(339)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	15,105	(7,098)
Ending Balance	$ 28,360	$ 2,316

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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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