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Loans and the Allowance for Loan Losses (Analysis of Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Recorded Invesment $ 2,081 $ 2,081 $ 2,121
No Related Allowance: Unpaid Principal Balance 2,531 2,531 2,570
With An Allowance Recorded: Recorded Investment 6,864 6,864 11,825
With An Allowance Recorded: Unpaid Principal Balance 6,864 6,864 12,365
With An Allowance Recorded: Related Allowance 758 758 1,085
Total Impaired: Recorded Investment 8,945 8,945 13,946
Total Impaired: Unpaid Principal Balance 9,395 9,395 14,935
Total Impaired: Related Allowance 758 758 1,085
No Related Allowance: Average Recorded Investment 2,246 2,246 6,838
No Related Allowance: Interest Income Recognized 28 86 160
With An Allowance Recorded: Average Recorded Investment 8,484 10,122 12,203
With An Allowance Recorded: Interest Income Recognized 34 145 378
Total Impaired: Average Recorded Investment 10,730 12,368 19,041
Total Impaired: Interest Income Recognized 62 231 538
Commercial and industrial [Member]
      
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Average Recorded Investment     292
No Related Allowance: Interest Income Recognized     11
Total Impaired: Average Recorded Investment     292
Total Impaired: Interest Income Recognized     11
Commercial real estate [Member]
      
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Recorded Invesment 2,081 2,081 2,121
No Related Allowance: Unpaid Principal Balance 2,531 2,531 2,570
With An Allowance Recorded: Recorded Investment 4,180 4,180 4,180
With An Allowance Recorded: Unpaid Principal Balance 4,180 4,180 4,180
With An Allowance Recorded: Related Allowance 512 512 567
Total Impaired: Recorded Investment 6,261 6,261 6,301
Total Impaired: Unpaid Principal Balance 6,711 6,711 6,750
Total Impaired: Related Allowance 512 512 567
No Related Allowance: Average Recorded Investment 2,246 2,246 3,390
No Related Allowance: Interest Income Recognized 28 86 149
With An Allowance Recorded: Average Recorded Investment 4,180 4,180 4,583
With An Allowance Recorded: Interest Income Recognized 34 103 258
Total Impaired: Average Recorded Investment 6,426 6,426 7,973
Total Impaired: Interest Income Recognized 62 189 407
Construction [Member]
      
Financing Receivable, Impaired [Line Items]      
With An Allowance Recorded: Recorded Investment     3,044
With An Allowance Recorded: Unpaid Principal Balance     3,584
With An Allowance Recorded: Related Allowance     200
Total Impaired: Recorded Investment     3,044
Total Impaired: Unpaid Principal Balance     3,584
Total Impaired: Related Allowance     200
No Related Allowance: Average Recorded Investment     3,156
With An Allowance Recorded: Average Recorded Investment   2,066 3,048
With An Allowance Recorded: Interest Income Recognized   16 18
Total Impaired: Average Recorded Investment   2,066 6,204
Total Impaired: Interest Income Recognized   16 18
Residential mortgage [Member]
      
Financing Receivable, Impaired [Line Items]      
With An Allowance Recorded: Recorded Investment 2,684 2,684 4,601
With An Allowance Recorded: Unpaid Principal Balance 2,684 2,684 4,601
With An Allowance Recorded: Related Allowance 246 246 318
Total Impaired: Recorded Investment 2,684 2,684 4,601
Total Impaired: Unpaid Principal Balance 2,684 2,684 4,601
Total Impaired: Related Allowance 246 246 318
With An Allowance Recorded: Average Recorded Investment 4,304 3,876 4,572
With An Allowance Recorded: Interest Income Recognized   26 102
Total Impaired: Average Recorded Investment 4,304 3,876 4,572
Total Impaired: Interest Income Recognized   $ 26 $ 102