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Investments (Details Textual) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 7,216,502 | $ 7,091,340
Investments (Additional Textual) [Abstract] |  |
Federal Home Loan Bank Funding Agreements | $ 575,000 | 575,000
Investment Grade Rate | 66.00% |
Federal Home Loans Bank Of Chicago [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 621,373 | 621,077
Governmental Agencies as Required by Law in Various States [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 18,392 | 18,312
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 234,668 | 231,294
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 342,877 | 363,957
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 126,252 | $ 130,940

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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