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Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Balance at beginning of period $ 46,264,790 $ 60,854,543 $ 46,024,098 $ 61,707,655
Net income (loss) 776,793 (8,206,891) 787,718 (9,054,829)
Unrealized gains on securities        
Unrealized holding gains arising during the year, net of tax 184,610 604,066 391,470 853,239
Less: reclassification adjustment for gains realized in net income, net of tax 1,235,115 0 1,235,115 297,974
Total comprehensive income (loss) (273,712) (7,602,825) (55,927) (8,499,564)
Share-based compensation 22,832 (50,551) 45,739 (6,924)
Balance at end of period $ 46,013,910 $ 53,201,167 $ 46,013,910 $ 53,201,167