Investments (Held-to-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,749	$ 3,303
Gross Unrecognized Gains	136	194
Gross Unrecognized Losses	0	0
Fair Value	1,885	3,497
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,410	2,026
Gross Unrecognized Gains	115	125
Gross Unrecognized Losses	0	0
Fair Value	1,525	2,151
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		55
Gross Unrecognized Gains		1
Gross Unrecognized Losses		0
Fair Value		56
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	145	996
Gross Unrecognized Gains	3	50
Gross Unrecognized Losses	0	0
Fair Value	148	1,046
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	194	226
Gross Unrecognized Gains	18	18
Gross Unrecognized Losses	0	0
Fair Value	$ 212	$ 244