Loans and Allowance for Loan Losses - Additional Information (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank wide delinquency of loans in percentage	2.05%	2.89%
Bank wide delinquency of loans, 30 to 59 days delinquent, percentage	0.39%	0.61%
Bank wide delinquency of loans, 60 to 89 days delinquent, percentage	0.13%	0.32%
Allocated reserves of nonaccrual TDR loans	$ 386
Additional commitments to lend	$ 638
Time period of repayment based on delinquency period one			59 days	30 days
Time period of repayment based on delinquency period two			89 days	60 days
Time period of repayment based on delinquency period three				90 days