Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Preferred stock, par value (in dollars per share)	$ 0	$ 0.01
Preferred stock, shares authorized	30,000,000	10,000,000
Common stock, par value (in dollars per share)		$ 5.00
Common stock, shares authorized		50,000,000
Common stock, shares issued		15,655,868
Common stock, shares outstanding		15,655,868
Held to maturity investment securities at market value	$ 52,401
Preferred Stock SeriesA
Preferred stock, shares issued	15,000	52,372
Preferred stock, shares outstanding	15,000	52,372
Preferred Stock, Capital Shares Reserved for Future Issuance	52,372	52,372
Preferred stock, liquidation preference	$ 1,000	$ 1,000
Preferred Stock SeriesB
Preferred stock, shares issued		422,456
Preferred stock, shares outstanding		422,456
Convertible Preferred Stock, Shares Reserved for Future Issuance	1,000,000	1,000,000
Preferred stock, liquidation preference	$ 100	$ 100
Preferred Stock SeriesC
Preferred stock, shares issued		140,217
Preferred stock, shares outstanding		140,217
Convertible Preferred Stock, Shares Reserved for Future Issuance	500,000	500,000
Preferred stock, liquidation preference	$ 100	$ 100
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0
Common stock, shares authorized	90,000,000
Common stock, shares issued	25,291,568
Common stock, shares outstanding	25,291,568
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0
Common stock, shares authorized	10,000,000
Common stock, shares issued	3,186,748
Common stock, shares outstanding	3,186,748