Loans and Allowance for Loan Losses (Details Textual) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Loans and Allowance for Loan Losses (Textual) [Abstract]
Nonaccruing loans, current	$ 492	$ 33
Interest income recognized on non-accruing loans	418	18
Increase in the provision for loan losses	137
Allocated allowance for loan losses on troubled debt restructurings	297		5
Loans originated for sale	59,109	34,992
Proceeds on sales of loan	56,930	35,239
Gains on sales of loans	1,509	883
Loans serviced for the benefit of others	$ 3,216	$ 2,570	$ 3,257
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Modification under restructuring of debt involving reduction of interest of loan term range	5 years
Modification under restructuring of debt involving extension of maturity date of loan term range	5 years
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Modification under restructuring of debt involving reduction of interest of loan term range	9 months
Modification under restructuring of debt involving extension of maturity date of loan term range	3 months