Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Aug. 04, 2011	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2010	Dec. 31, 2013
Class of Stock [Line Items]
Liquidation preference per share		$ 1,000			$ 1,000
Securities purchase agreement, share repurchase amount		$ 11,879,000
Par value per share		$ 1.00			$ 1.00
Treasury's small business lending fund				30,000,000,000
Treasury's small business lending fund, maximum asset value, qualified banks				10,000,000,000
Period where dividend rate remains unchanged if preferred stock remains outstanding, in years		4 years 6 months
Preferred stock dividend rate	3.874%	1.00%	1.00%
Expected dividend rate at a fixed rate for a specified period		9.00%
Par value per share		$ 10.00			$ 10.00
Noncumulative Preferred Stock [Member]
Class of Stock [Line Items]
Shares of perpetual preferred stock		13,000
Liquidation preference per share		$ 1,000
Aggregate purchase price		$ 13,000,000
Minimum [Member]
Class of Stock [Line Items]
Expected dividend rate for the second through tenth dividend periods		1.00%
Expected dividend rate at a fixed rate for a specified period		1.00%
Maximum [Member]
Class of Stock [Line Items]
Expected dividend rate for the second through tenth dividend periods		5.00%
Expected dividend rate at a fixed rate for a specified period		7.00%