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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 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]      
No Related Allowance: Recorded Invesment $ 2,093 $ 2,093 $ 2,121
No Related Allowance: Unpaid Principal Balance 2,542 2,542 2,570
With An Allowance Recorded: Recorded Investment 8,226 8,226 11,825
With An Allowance Recorded: Unpaid Principal Balance 8,226 8,226 12,365
With An Allowance Recorded: Related Allowance 871 871 1,085
Total Impaired: Recorded Investment 10,319 10,319 13,946
Total Impaired: Unpaid Principal Balance 10,768 10,768 14,935
Total Impaired: Related Allowance 871 871 1,085
No Related Allowance: Average Recorded Investment 2,250 2,250 6,838
No Related Allowance: Interest Income Recognized 28 58 160
With An Allowance Recorded: Average Recorded Investment 11,069 11,490 12,203
With An Allowance Recorded: Interest Income Recognized 83 144 378
Total Impaired: Average Recorded Investment 13,319 13,740 19,041
Total Impaired: Interest Income Recognized 111 202 538
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 2,093 2,093 2,121
No Related Allowance: Unpaid Principal Balance 2,542 2,542 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 531 531 567
Total Impaired: Recorded Investment 6,273 6,273 6,301
Total Impaired: Unpaid Principal Balance 6,722 6,722 6,750
Total Impaired: Related Allowance 531 531 567
No Related Allowance: Average Recorded Investment 2,250 2,250 3,390
No Related Allowance: Interest Income Recognized 28 58 149
With An Allowance Recorded: Average Recorded Investment 4,180 4,180 4,583
With An Allowance Recorded: Interest Income Recognized 34 69 258
Total Impaired: Average Recorded Investment 6,430 6,430 7,973
Total Impaired: Interest Income Recognized 62 127 407
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 2,873 3,093 3,048
With An Allowance Recorded: Interest Income Recognized 16 16 18
Total Impaired: Average Recorded Investment 2,873 3,093 6,204
Total Impaired: Interest Income Recognized 16 16 18
Residential mortgage [Member]
      
Financing Receivable, Impaired [Line Items]      
With An Allowance Recorded: Recorded Investment 4,046 4,046 4,601
With An Allowance Recorded: Unpaid Principal Balance 4,046 4,046 4,601
With An Allowance Recorded: Related Allowance 340 340 318
Total Impaired: Recorded Investment 4,046 4,046 4,601
Total Impaired: Unpaid Principal Balance 4,046 4,046 4,601
Total Impaired: Related Allowance 340 340 318
With An Allowance Recorded: Average Recorded Investment 4,016 4,217 4,572
With An Allowance Recorded: Interest Income Recognized 33 59 102
Total Impaired: Average Recorded Investment 4,016 4,217 4,572
Total Impaired: Interest Income Recognized $ 33 $ 59 $ 102