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Allowance for Loan Losses (Rollforward of the Allowance for Loan Losses by Portfolio Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 11,145 $ 13,317 $ 12,571 $ 14,623
Charge-offs (57) (333) (1,663) (877)
Recoveries 95 45 375 408
Provision (credit) for loan losses    (200) (100) (1,325)
Balance at end of period 11,183 12,829 11,183 12,829
Commercial [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 2,780 2,352 2,596 2,365
Charge-offs    (246)    (345)
Recoveries 17 14 48 126
Provision (credit) for loan losses 891 277 1,044 251
Balance at end of period 3,688 2,397 3,688 2,397
Commercial loans secured by real estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 5,983 8,378 7,796 9,400
Charge-offs       (1,480) (172)
Recoveries 39 8 181 208
Provision (credit) for loan losses (993) (515) (1,468) (1,565)
Balance at end of period 5,029 7,871 5,029 7,871
Real estate-mortgage [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 1,279 1,206 1,269 1,270
Charge-offs (49) (51) (96) (190)
Recoveries 31 9 98 38
Provision (credit) for loan losses 62 57 52 103
Balance at end of period 1,323 1,221 1,323 1,221
Consumer [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 146 155 150 174
Charge-offs (8) (36) (87) (170)
Recoveries 8 14 48 36
Provision (credit) for loan losses (6) 17 29 110
Balance at end of period 140 150 140 150
Allocation for general risk [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 957 1,226 760 1,414
Charge-offs            
Recoveries            
Provision (credit) for loan losses 46 (36) 243 (224)
Balance at end of period $ 1,003 $ 1,190 $ 1,003 $ 1,190