Investments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Loans originated during the year	$ 34,100,000	$ 21,500,000
Recognized valuation losses	0	650,000	609,000
Specific principle balances requiring a valuation allowance	0	0	7,000,000
Mortgage loans, write-downs	600,000
Interest recorded for impaired loans	0	0	300,000
Equity securities realized gains		2,700,000
Real estate investments	30,991,000	41,439,000
Realized gains (losses) on investments	8,653,000	13,200,000	6,063,000
Unrealized holding loss at the date of transfer	0	227,000	41,000
Securities transferred from available-to-sale to held-to-maturity category		4,600,000
Amortization of remaining balance of net unamortized losses		300,000
Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Realized gains (losses) on investments	9,000,000	14,500,000	6,200,000
Held-to-maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	300,000
Real Estate [Member]
Schedule of Available-for-sale Securities [Line Items]
Real estate investments	18,200,000	18,800,000
Operating income recognized on real estate investment properties	1,700,000	1,600,000	1,600,000
Realized gains (losses) on investments	300,000	2,600,000	(100,000)
Other-than Temporary Impairment Write-down on Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Realized gains (losses) on investments	200,000
External Credit Rating, Non Investment Grade [Member] | Debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities below investment grade	$ 178,600,000	$ 165,800,000
Debt securities below investment grade, percentage of total invested assets	1.90%	1.80%