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Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance $ 8,349 $ 8,068 $ 8,068
Charge-offs (754) (700)  
Recoveries 25 23  
Provision for loan losses 671 672  
Ending Balance 8,291 8,063 8,349
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 273   554
Collectively evaluated for impairment 8,018   7,795
Total 8,291 8,063 8,349
Loans [Abstract]      
Individually evaluated for impairment 17,258   18,456
Collectively evaluated for impairment 558,607   574,659
Total 575,865   593,115
Ratios for allowance for loan losses [Abstract]      
Ratio of allowance for loan losses to the end of period loans, net of unearned income and deferred fees (in hundredths) 1.44% 1.38% 1.41%
Ratio of net charge-offs to average loans, net of unearned income and deferred fees (in hundredths) 0.50% [1] 0.46% [1] 0.49% [1]
Nonperforming assets [Abstract]      
Nonaccrual loans 10,734 1,789 10,870
Restructured loans in nonaccrual 1,691 3,539 2,151
Total nonperforming loans 12,425 5,328 13,021
Other real estate owned, net 1,094 940 1,435
Total nonperforming assets 13,519 6,268 14,456
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned (in hundredths) 2.35% 1.07% 2.44%
Ratio of allowance for loan losses to nonperforming loans (in hundredths) 66.73% [2] 151.33% [2] 64.12% [2]
Number of days loans past due, minimum 90 days    
Summary of loans past due 90 days or more and impaired loans [Abstract]      
Loans past due 90 days or more and still accruing 568 210 170
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees (in hundredths) 0.10% 0.04% 0.03%
Accruing restructured loans 5,732 3,742 2,005
Impaired loans:      
Impaired loans with no valuation allowance 16,263 9,933 16,974
Impaired loans with a valuation allowance 995 3,054 1,482
Total impaired loans 17,258 12,987 18,456
Valuation allowance (273) (593) (554)
Impaired loans, net of allowance 16,985 12,394 17,902
Average recorded investment in impaired loans 17,935 [3],[4] 14,555 [3] 13,540 [3],[4]
Income recognized on impaired loans, after designation as impaired 10 24 9
Amount of income recognized on a cash basis 0 0 0
Real Estate Construction [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 1,070 1,079 1,079
Charge-offs (184) 0  
Recoveries 0 0  
Provision for loan losses 287 (405)  
Ending Balance 1,173 674  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 1,173   1,070
Total 1,173 674  
Loans [Abstract]      
Individually evaluated for impairment 6,492   6,643
Collectively evaluated for impairment 44,356   43,670
Total 50,848   50,313
Consumer Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,263 1,245 1,245
Charge-offs (53) (95)  
Recoveries 0 0  
Provision for loan losses (364) 1,102  
Ending Balance 1,846 2,252  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 0   43
Collectively evaluated for impairment 1,846   2,220
Total 1,846 2,252  
Loans [Abstract]      
Individually evaluated for impairment 478   864
Collectively evaluated for impairment 139,216   142,398
Total 139,694   143,262
Commercial Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 3,442 3,515 3,515
Charge-offs (35) (537)  
Recoveries 0 0  
Provision for loan losses (118) 242  
Ending Balance 3,289 3,220  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 269   273
Collectively evaluated for impairment 3,020   3,169
Total 3,289 3,220  
Loans [Abstract]      
Individually evaluated for impairment 9,927   10,329
Collectively evaluated for impairment 284,651   293,979
Total 294,578   304,308
Consumer Non Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 424 403 403
Charge-offs (78) (68)  
Recoveries 9 23  
Provision for loan losses 230 124  
Ending Balance 585 482  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 3   7
Collectively evaluated for impairment 582   417
Total 585 482  
Loans [Abstract]      
Individually evaluated for impairment 43   46
Collectively evaluated for impairment 28,538   31,668
Total 28,581   31,714
Commercial Non Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 959 1,473 1,473
Charge-offs (404) 0  
Recoveries 16 0  
Provision for loan losses 705 (347)  
Ending Balance 1,276 1,126  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 1   231
Collectively evaluated for impairment 1,275   728
Total 1,276 1,126  
Loans [Abstract]      
Individually evaluated for impairment 318   574
Collectively evaluated for impairment 35,160   36,775
Total 35,478   37,349
Public Sector and IDA [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 142 232 232
Charge-offs 0 0  
Recoveries 0 0  
Provision for loan losses (32) (147)  
Ending Balance 110 85 142
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 110   142
Total 110 85 142
Loans [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 26,686   26,169
Total 26,686   26,169
Nonperforming assets [Abstract]      
Total nonperforming loans 0   0
Summary of loans past due 90 days or more and impaired loans [Abstract]      
Loans past due 90 days or more and still accruing 0   0
Impaired loans:      
Total impaired loans 0   0
Valuation allowance 0   0
Average recorded investment in impaired loans 0 [4]   0 [4]
Income recognized on impaired loans, after designation as impaired 0   0
Unallocated [Member]
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 49 121 121
Charge-offs 0 0  
Recoveries 0 0  
Provision for loan losses (37) 103  
Ending Balance 12 224  
Allowance for Loan Losses [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 12   49
Total 12 224  
Loans [Abstract]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 0   0
Total $ 0   $ 0
[1] Net charge-offs are on an annualized basis.
[2] The Company defines nonperforming loans as nonaccrual loans. Loans 90 days or more past due and still accruing and accruing restructured loans are excluded.
[3] Recorded investment includes principal, accrued interest and net deferred fees.
[4] Recorded investment includes the unpaid principal balance and any accrued interest and net deferred fees.