Investments (Credit Quality Indicators) (Details) (Commercial Mortgage and Agricultural Loans [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Service Coverage Ratio, Greater than One Point Two X [Member] | Loan To Value Ratio Less Than Fifty Nine Point Nine Nine Percent [Member]
Financing Receivable	$ 246,541	$ 251,278
Debt Service Coverage Ratio, Greater than One Point Two X [Member] | Loan To Value Ratio Sixty Percent To Sixty Nine Point Nine Nine Percent [Member]
Financing Receivable	121,211	102,755
Debt Service Coverage Ratio, Greater than One Point Two X [Member] | Loan-to-Value Ratio, Seventy Percent To Seventy Nine Point Nine Nine Percent [Member]
Financing Receivable	28,262	31,712
Debt Service Coverage Ratio, Greater than One Point Two X [Member] | Loan-to-Value Ratio Greater than Eighty Percent [Member]
Financing Receivable	3,116	0
Debt Service Coverage Ratio, Greater than One Point Two X [Member] | Loan To Value Ratio Total [Member]
Financing Receivable	399,130	385,745
Debt Service Coverage Ratio, One Point Zero X to Less Than One Point Two X [Member] | Loan To Value Ratio Less Than Fifty Nine Point Nine Nine Percent [Member]
Financing Receivable	9,581	7,650
Debt Service Coverage Ratio, One Point Zero X to Less Than One Point Two X [Member] | Loan To Value Ratio Sixty Percent To Sixty Nine Point Nine Nine Percent [Member]
Financing Receivable	0	0
Debt Service Coverage Ratio, One Point Zero X to Less Than One Point Two X [Member] | Loan-to-Value Ratio, Seventy Percent To Seventy Nine Point Nine Nine Percent [Member]
Financing Receivable	1,478	2,247
Debt Service Coverage Ratio, One Point Zero X to Less Than One Point Two X [Member] | Loan-to-Value Ratio Greater than Eighty Percent [Member]
Financing Receivable	0	0
Debt Service Coverage Ratio, One Point Zero X to Less Than One Point Two X [Member] | Loan To Value Ratio Total [Member]
Financing Receivable	11,059	9,897
Debt Service Coverage Ratio, Less Than One Point Zero X [Member] | Loan To Value Ratio Less Than Fifty Nine Point Nine Nine Percent [Member]
Financing Receivable	3,003	1,865
Debt Service Coverage Ratio, Less Than One Point Zero X [Member] | Loan To Value Ratio Sixty Percent To Sixty Nine Point Nine Nine Percent [Member]
Financing Receivable	0	0
Debt Service Coverage Ratio, Less Than One Point Zero X [Member] | Loan-to-Value Ratio, Seventy Percent To Seventy Nine Point Nine Nine Percent [Member]
Financing Receivable	0	0
Debt Service Coverage Ratio, Less Than One Point Zero X [Member] | Loan-to-Value Ratio Greater than Eighty Percent [Member]
Financing Receivable	0	0
Debt Service Coverage Ratio, Less Than One Point Zero X [Member] | Loan To Value Ratio Total [Member]
Financing Receivable	3,003	1,865
Debt Service Coverage Ratio Total [Member] | Loan To Value Ratio Less Than Fifty Nine Point Nine Nine Percent [Member]
Financing Receivable	259,125	260,793
Debt Service Coverage Ratio Total [Member] | Loan To Value Ratio Sixty Percent To Sixty Nine Point Nine Nine Percent [Member]
Financing Receivable	121,211	102,755
Debt Service Coverage Ratio Total [Member] | Loan-to-Value Ratio, Seventy Percent To Seventy Nine Point Nine Nine Percent [Member]
Financing Receivable	29,740	33,959
Debt Service Coverage Ratio Total [Member] | Loan-to-Value Ratio Greater than Eighty Percent [Member]
Financing Receivable	3,116	0
Debt Service Coverage Ratio Total [Member] | Loan To Value Ratio Total [Member]
Financing Receivable	$ 413,192	$ 397,507