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Loans and the Allowance for Loan Losses (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
loan
Dec. 31, 2012
Loans and the Allowance for Loan Losses [Abstract]    
Loans and Leases Receivable, Related Parties $ 19,406,000 $ 18,977,000
Loans and Leases Receivable, Related Parties, Additions 1,038,000  
Loans and Leases Receivable, Related Parties, Collections 609,000  
Loans Pledged as Collateral 562,800,000 532,800,000
Troubled debt restructurings: Number of Loans 0  
Total Impaired: Recorded Investment 6,894,000 6,935,000
Impaired Financing Receivable, Recorded Investment 6,894,000 6,935,000
Total Impaired: Related Allowance 585,000 645,000
Total Impaired: Unpaid Principal Balance 7,344,000 7,385,000
Impaired Financing Receivable, Unpaid Principal Balance 7,344,000 7,385,000
No Related Allowance: Recorded Invesment 1,500,000 1,500,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 33,000 187,000
Financing Receivable, Modifications, Recorded Investment 8,300,000 8,300,000
Loans modified in troubled debt restructuring on non-accrual status 1,500,000 1,500,000
Loans on which concessions were made 1,600,000  
Loans on which two or more concessions were made $ 6,700,000