Preferred Stock and Common Stock Warrant (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Sep. 30, 2010	Feb. 27, 2009	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Sep. 29, 2010
Class of Stock [Line Items]
Preferred stock, shares issued			30,000		30,000
Proceeds received in exchange		$ 30,000
Adjustments to additional paid-in capital, common stock warrant		1,363
Shares Authorized			2,000,000		2,000,000
Shares Outstanding			30,000		30,000
Carrying Value			19,212		18,865
Common Stock
Class of Stock [Line Items]
Number of shares to be purchased by warrants		513,113
Exercise price of warrants		8.77
Preferred Class A
Class of Stock [Line Items]
Dividend Rate			0.00%
Shares Authorized			1,000,000		1,000,000
Shares Outstanding			0		0
Carrying Value			0		0
Preferred Class B
Class of Stock [Line Items]
Shares Authorized			1,000,000		1,000,000
Carrying Value		28,637
Preferred Class B | Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued		30,000
Warrant term		10 years
Liquidation preference		$ 1,000
Fair value of stock on exchange date	29,026
Dividend Rate		5.00%	5.00%
Shares Outstanding			0		0
Carrying Value			0		0
Preferred Class B | Series CD Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued		30,000				30,000
Liquidation preference		$ 1,000
Expected dividend rate			9.00%
Discount rate			10.00%
Accretion period of redemption discount			8 years
Accretion of redemption discount			347	313
Period for initial dividend rate			8 years
Gain recorded on exchange of stock	12,867
Dividend Rate		9.00%	2.00%
Shares Outstanding			30,000		30,000
Carrying Value			$ 19,212		$ 18,865	$ 16,159
Preferred Class B | Series CD Preferred Stock | Banking Subsidiary Uncertified for 180 Days
Class of Stock [Line Items]
Number of days uncertified, first period			180 days
Dividend Rate			5.00%
Preferred Class B | Series CD Preferred Stock | Banking Subsidiary Uncertified for 270 Days
Class of Stock [Line Items]
Number of days uncertified, second period			90 days
Dividend Rate			9.00%