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Investments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 7,456,708 | $ 7,091,340
Investments (Additional Textual) [Abstract] |  |
Federal Home Loan Bank Funding Agreements | $ 575,000 |
Investment Grade Rate | 88.00% |
Fair Value, Inputs, Level 3 [Member] |  |
Investments (Additional Textual) [Abstract] |  |
Asset Impairment Charges | $ 1,833 |
Federal Home Loans Bank Of Chicago [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 620,489 | 621,077
Governmental Agencies as Required by Law in Various States [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 18,119 | 18,312
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 196,468 | 231,294
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 284,050 | 363,957
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 115,627 | $ 130,940

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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