Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Securities available for sale:
Amortized cost of mortgage-backed and related securities	$ 25,410	$ 32,036
Amortized cost of other marketable securities	$ 107,616	$ 118,631
Stockholders' equity:
Serial preferred stock, par value	$ 0.01	$ 0.01
Serial preferred stock, shares authorized	500,000	500,000
Serial preferred stock, shares issued	26,000	26,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	11,000,000	11,000,000
Common stock, shares issued	9,128,662	9,128,662
Treasury stock, shares	4,740,711	4,818,263