Investments (Investment Gains and Losses) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Held to maturity debt securities:
Real estate write-down	$ (159,000)	$ 0	$ (159,000)	$ (50,000)
Mortgage loans write-downs	0	0	0	(39,000)
Other	0	0	0	0
Totals	2,425,000	490,000	3,791,000	3,582,000
Total other-than-temporary impairment losses on debt securities	(156,000)	0	(409,000)	0
Portion of loss (gain) recognized in comprehensive income	(235,000)	0	(157,000)	0
Net impairment losses on debt securities recognized in earnings	(391,000)	0	(566,000)	0
Equity securities impairments	(29,000)	0	(53,000)
Net OTTI losses recognized in earnings	(420,000)	0	(619,000)	0
Non-Credit Other-than-Temporary Impairment, Credit Losses Recognized in Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance, cumulative credit losses related to other-than-temporary impairments	1,297,000		1,122,000	997,000	997,000
Additions for credit losses not previously recognized in other-than-temporary impairments	391,000		566,000		125,000
Ending balance, cumulative credit losses related to other-than-temporary impairments	1,688,000		1,688,000		1,122,000
Debt Securities [Member]
Held to maturity debt securities:
Realized gains on disposal	44,000	104,000	160,000	478,000
Realized losses on disposal	(39,000)	0	(413,000)	0
Debt Securities [Member]
Available for sale debt securities:
Realized gains on disposal	2,579,000	330,000	4,207,000	3,137,000
Realized losses on disposal	0	0	0	0
Equity Securities [Member]
Held to maturity debt securities:
Equity securities realized gains (losses)	$ 0	$ 56,000	$ (4,000)	$ 56,000