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Income Tax Expense (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Partnership | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Partnership
Income Tax Expense [Abstract] |  |  |
Number of investments in partnerships | Partnership | 4 |  | 4
Investment amount in partnerships | $ 514,000 |  | $ 541,000
Investment Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Investment tax credits | $ 670,000 |  |
Tax credits recognition period | 4 years 9 months |  |
Tax credits recognized as reduction of tax expense amount | $ 35,000 | $ 35,000 |
Amortization of investments in other expenses | $ 27,000 | $ 40,000 |

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- Definition The amount of recognized income tax credits during the period. + References No definition available. + Details
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- Definition Amount of write-down from impairment of an investment in a qualified affordable housing project. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of long-term investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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