Income Taxes (Reconciliation of Statutory and Effective Tax Rates) (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	21.00%	21.00%
Effective tax rate increase (decrease) - State taxes net of federal benefit	2.60%	2.00%	2.30%
Effective tax rate increase (decrease) - Tax-exempt interest	(0.90%)	(1.70%)	(1.50%)
Effective tax rate increase (decrease) - Life insurance	(0.80%)	(1.60%)	(1.00%)
Effective tax rate increase (decrease) - Tax credits	(4.40%)	(6.00%)	(4.20%)
Effective tax rate increase (decrease) - unrecognized tax benefits, percent	0.30%	(1.60%)	(0.10%)
Effective tax rate increase (decrease) - subsidiary liquidation, percent		(1.20%)
Effective tax rate increase (decrease) - Other	0.30%	1.50%	(0.10%)
Effective tax rate	18.10%	12.40%	16.40%

Effective Income Tax Rate Reconciliation, Unrecognized Tax Benefits, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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