Stockholders' Equity (Details) - USD ($)			9 Months Ended	12 Months Ended
	Mar. 06, 2015	Aug. 04, 2011	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Liquidation preference per share			$ 1,000	$ 1,000
Securities purchase agreement, share repurchase amount			$ 11,879,000
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			1.00%	1.00%	3.874%
Expected dividend rate at a fixed rate for a specified period			9.00%
Preferred shares outstanding	3,250
Noncumulative Preferred Stock [Member]
Class of Stock [Line Items]
Shares of perpetual preferred stock		13,000
Liquidation preference per share		$ 1,000
Aggregate proceeds		$ 13,000,000
Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation preference per share	$ 1,000
Aggregate liquidation preference	$ 9,767,604.00
Shares redeemed	9,750
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%