Senior Non-Cumulative Perpetual Preferred Stock (Details) (USD $)	3 Months Ended	9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 item	Dec. 31, 2011	Sep. 30, 2012 SBLF Preferred Stock [Member] item	Sep. 21, 2011 SBLF Preferred Stock [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Qualified Small Business Lending QSBL [Member] Minimum [Member]	Sep. 30, 2012 Qualified Small Business Lending QSBL [Member] Maximum [Member]
Class of Stock [Line Items]
Preferred stock, shares issued	8,381	8,381	8,381		8,381
Preferred Stock, Value, Issued	$ 8,381,000	$ 8,381,000	$ 8,381,000		$ 8,400,000
Number of months in which the dividend rate can fluctuate (months)		30 months
Preferred stock dividend rate, percent	1.00%	1.00%				1.00%	5.00%	1.00%	7.00%
Period after issuance, the dividend rate may be adjusted from 1% to 5% to reflect changes to the Bank's QSBL, in months						6 months	27 months
Preferred stock threshold for dividend payable rate calculation, percent		10.00%
Period after issuance dividend rate will be fixed from 1% to 7% based upon the increase in QSBL, in years/months						30 months	4 years 6 months
Period in which qualified small business loans increases compared to the baseline, in months		27 months
Period from issuance, in which dividend rate will increase 9% per annum until SBLF funding is repaid in full, in years		4 years 6 months
Preferred stock dividend rate percentage increase subject to repayment terms, percent		9.00%
Dividend amount	21,000	68,000
Number of dividend payments missed in which observers can be appointed to the board of directors, dividend payments				5
Number of dividend payments missed combined with financial measures that trigger changes to board of directors, dividend payments				6
Preferred stock aggregate liquidation amount		$ 25,000,000
Number of directors designated by SBLF if limited circumstances occur, directors		2
Preferred stock redemption terms threshold funding amount, percentage		25.00%
Preferred stock redemption terms percentage of liquidation amount, percent		100.00%
Period after the current in which terms of the SBLF apply if fail to declare or pay dividend, in months		9 months
Tier 1 capital terms percentage of capital to signing date capital, percent		90.00%
Tier 1 dividend threshold percentage reduction, percent		10.00%
Tier 1 dividend threshold percentage incremental increase, percent		1.00%