Non-performing Assets and Impaired Loans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Contract ConsecutivePayment	Dec. 31, 2011
Non-Performing Loans and Impaired Loans (Additional Textual) [Abstract]
Non-accrual loans	$ 13,374,000	$ 14,368,000
Non-performing TDR's	6,600,000
Loan acquired included in non-accrual loans	3,200,000
Loan acquired included in non-performing TDR's	2,200,000
Minimum period required for satisfactory performance before returning to accrual status	6 months
Restructured loans with modified recorded balances	0
Restructured loan returned to accruing status number of Consecutive Payments of loan	6
Restructured loan reported in TDRs	10,400,000
Number TDRs returned to accrual status	0
Specific reserves allocated to troubled debt restructuring	1,800,000
Loans with an aggregate credit exposure	500,000
Loans classified as TDR after a period	90 days
Loan delinquent period	90 days
Maximum [Member]
Non-Performing Loans and Impaired Loans (Textual) [Abstract]
Delay or shortfall in payments of loan	30 days or more
Minimum [Member]
Non-Performing Loans and Impaired Loans (Textual) [Abstract]
Period for loans moved to non accrual status	90 days or more
Performing Financing Receivable [Member]
Non-Performing Loans and Impaired Loans (Textual) [Abstract]
Restructured loan	$ 3,700,000
Good Pass [Member]
Non-Performing Loans and Impaired Loans (Textual) [Abstract]
Number of consecutive years of profit for Good Pass Rating	3 years
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating	5 years
Number of years of Satisfactory Relationship with bank for Good Pass Rating	5 years
Satisfactory Pass [Member]
Non-Performing Loans and Impaired Loans (Textual) [Abstract]
Number of years of Satisfactory Repayment for Good Pass Rating, Minimum	2 years