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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

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