Investments (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Security	Mar. 31, 2012	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 20,397,000		$ 23,651,000
Gross Unrealized Gains	58,000		46,000
Gross Unrealized Losses 1 Year Or Less	(265,000)		(278,000)
Gross Unrealized Losses Greater Than 1 Year	(477,000)		(519,000)
Estimated Fair Value	19,713,000		22,900,000
Amortized cost and fair value of mortgage-backed securities by contractual maturity [Abstract]
Due after ten years, Amortized Cost	20,397,000
Due after ten years, Fair Value	19,713,000
Securities pledged as collateral, amortized cost	8,100,000
Securities pledged as collateral, fair value	8,000,000
Letters of credit to secure deposits	24,500,000
Gain (loss) on sales of available for sale securities [Abstract]
Sales of available for sale securities	0	0
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	16,962,000		17,685,000
12 Months or Longer	1,503,000		2,137,000
Total	18,465,000		19,822,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	(265,000)		(278,000)
12 Months or Longer	(477,000)		(519,000)
Total	(742,000)		(797,000)
Other than temporary impairment, credit losses recognized in earnings [Roll Forward]
Estimated credit losses, beginning balance	420,000	256,000
Additions for credit losses not previously recognized	19,000	91,000
Reduction for increases in cash flows	0	0
Reduction for realized losses	0	0
Estimated credit losses, ending balance	439,000	347,000
Number of securities reflecting OTTI	4
Agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,276,000		20,378,000
Gross Unrealized Gains	5,000		27,000
Gross Unrealized Losses 1 Year Or Less	(265,000)		(278,000)
Gross Unrealized Losses Greater Than 1 Year	0		0
Estimated Fair Value	17,016,000		20,127,000
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	16,962,000		17,685,000
12 Months or Longer	0		0
Total	16,962,000		17,685,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	(265,000)		(278,000)
12 Months or Longer	0		0
Total	(265,000)		(278,000)
Other than temporary impairment, credit losses recognized in earnings [Roll Forward]
Number of portfolio securities	17
Number of securities in unrealized loss position	15
Non-agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,121,000		3,273,000
Gross Unrealized Gains	53,000		19,000
Gross Unrealized Losses 1 Year Or Less	0		0
Gross Unrealized Losses Greater Than 1 Year	(477,000)		(519,000)
Estimated Fair Value	2,697,000		2,773,000
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	0		0
12 Months or Longer	1,503,000		2,137,000
Total	1,503,000		2,137,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	0		0
12 Months or Longer	(477,000)		(519,000)
Total	$ (477,000)		$ (519,000)
Other than temporary impairment, credit losses recognized in earnings [Roll Forward]
Number of portfolio securities	5
Number of securities in unrealized loss position	3