Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Security	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 23,651,000	$ 3,992,000
Gross Unrealized Gains	46,000	6,000
Gross Unrealized Losses 1 Year Or Less	(278,000)	0
Gross Unrealized Losses Greater Than 1 Year	(519,000)	(1,006,000)
Estimated Fair Value	22,900,000	2,992,000
Amortized cost and fair value of mortgage-backed securities by contractual maturity [Abstract]
Due after ten years, Amortized Cost	23,651,000
Due after ten years, Fair Value	22,900,000
Securities pledged as collateral, amortized cost	49,000
Securities pledged as collateral, fair value	55,000
Letters of credit to secure deposits	31,500,000
Gain (loss) on sales of available for sale securities [Abstract]
Proceeds	0	1,118,000
Gross gains	0	3,000
Gross losses	0	(37,000)
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	17,685,000	0
12 Months or Longer	2,137,000	2,933,000
Total	19,822,000	2,933,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	(278,000)	0
12 Months or Longer	(519,000)	(1,006,000)
Total	(797,000)	(1,006,000)
Other than temporary impairment, credit losses recognized in earnings [Roll Forward]
Estimated credit losses, beginning balance	256,000	160,000
Additions for credit losses not previously recognized	164,000	96,000
Reduction for increases in cash flows	0	0
Reduction for realized losses	0	0
Estimated credit losses, ending balance	420,000	256,000
Number of securities reflecting OTTI	4
Agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,378,000	53,000
Gross Unrealized Gains	27,000	6,000
Gross Unrealized Losses 1 Year Or Less	(278,000)	0
Gross Unrealized Losses Greater Than 1 Year	0	0
Estimated Fair Value	20,127,000	59,000
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	17,685,000
12 Months or Longer	0
Total	17,685,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	(278,000)
12 Months or Longer	0
Total	(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	13
Non-agency mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,273,000	3,939,000
Gross Unrealized Gains	19,000	0
Gross Unrealized Losses 1 Year Or Less	0	0
Gross Unrealized Losses Greater Than 1 Year	(519,000)	(1,006,000)
Estimated Fair Value	2,773,000	2,933,000
Continuous unrealized loss position, Fair Value [Abstract]
Less Than 12 Months	0	0
12 Months or Longer	2,137,000	2,933,000
Total	2,137,000	2,933,000
Continuous unrealized loss position, Unrealized Loss [Abstract]
Less Than 12 Months	0	0
12 Months or Longer	(519,000)	(1,006,000)
Total	$ (519,000)	$ (1,006,000)
Other than temporary impairment, credit losses recognized in earnings [Roll Forward]
Number of portfolio securities	5
Number of securities in unrealized loss position	4