Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Held-to-maturity securities, at fair value	$ 4,161	$ 6,422
Available-for-sale securities, at amortized cost	2,562,786	2,178,666
Equity securities at Cost	68,559	54,139
Trading securities, at amortized cost	13,429	12,322
Allowance for doubtful accounts	825	1,001
Property and equipment accumulated depreciation	$ 35,248	$ 33,397
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	25,505,350	26,195,552
Common stock, shares outstanding	25,505,350	26,195,552