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Federal Income Taxes - Tax Status of Dividends (Parenthetical) (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend per common share | $ 0.29 | $ 0.28 | $ 0.28 | $ 0.28 | $ 0.28 | $ 0.27 | $ 0.27 | $ 0.27 | $ 1.13 | $ 1.09 | $ 1.05
Dividend per common share, 2018 |  |  |  |  |  |  |  |  |  | 0.06 |
Dividend per common share, 2019 |  |  |  |  |  |  |  |  |  | $ 0.22 |

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- Definition Allocation of common stock dividend per share, current fiscal year. + References No definition available. + Details
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- Definition Allocation of common stock dividend per share, next fiscal year. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- References No definition available. + Details
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