Investments (Held-to-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,336	$ 3,303
Gross Unrecognized Gains	165	194
Gross Unrecognized Losses	0	0
Fair Value	2,501	3,497
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,619	2,026
Gross Unrecognized Gains	121	125
Gross Unrecognized Losses	0	0
Fair Value	1,740	2,151
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0	55
Gross Unrecognized Gains	0	1
Gross Unrecognized Losses	0	0
Fair Value	0	56
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	515	996
Gross Unrecognized Gains	27	50
Gross Unrecognized Losses	0	0
Fair Value	542	1,046
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	202	226
Gross Unrecognized Gains	17	18
Gross Unrecognized Losses	0	0
Fair Value	$ 219	$ 244