Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Amortized cost of available-for-sale securities	$ 472,242,000	$ 430,836,000
Preferred stock, par value	$ 0.00	$ 0.00
Preferred stock, shares authorized	0.00	0.00
Preferred stock, shares issued	0	0
Common stock, par value	$ 0	$ 0.00
Common stock, shares authorized	2,500,000,000	2,500,000,000
Common stock, shares issued	21,102,082	21,102,668
Preferred Stock Series A [Member]
Preferred stock, par value	$ 0.00	$ 0.00
Preferred stock, shares authorized	0	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Preferred stock, stated value	$ 0	$ 0