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Loans, net and allowance for loan losses, Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | $ 5,651 | $ 10,180 | $ 5,651 | $ 10,180 | $ 9,341
With an allowance recorded, Total | 7,217 | 6,018 | 7,217 | 6,018 | 8,151
Total | 12,868 | 16,198 | 12,868 | 16,198 | 17,492
Unpaid Principal Balance [Abstract] |  |  |  |  |
With no related allowance, Total | 5,651 | 10,180 | 5,651 | 10,180 | 9,341
With an allowance recorded, Total | 7,217 | 6,018 | 7,217 | 6,018 | 8,151
Total | 12,868 | 16,198 | 12,868 | 16,198 | 17,492
Related Allowance [Abstract] |  |  |  |  |
With an allowance recorded, Total | 726 | 1,197 | 726 | 1,197 | 810
Average Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 6,029 | 10,969 | 6,169 | 11,224 | 10,840
With an allowance recorded, Total | 7,281 | 5,106 | 7,740 | 4,688 | 6,560
Total | 13,310 | 16,075 | 13,909 | 15,912 | 17,400
Interest Income Recognized [Abstract] |  |  |  |  |
With no related allowance, Total | 74 | 129 | 110 | 270 | 386
With an allowance recorded, Total | 48 | 46 | 109 | 87 | 290
Total | 122 | 175 | 219 | 357 | 676
Information concerning trouble debt restructurings by major loan category [Abstract] |  |  |  |  |
Number of Contracts | 3 |  | 3 |  | 3
Accrual Status | 1,654 |  | 1,654 |  | 1,667
Nonaccrual Status | 2,198 |  | 2,198 |  | 2,294
Total Modifications | 3,852 | 4,738 | 3,852 | 4,738 | 3,961
Commercial [Member] |  |  |  |  |
Information concerning trouble debt restructurings by major loan category [Abstract] |  |  |  |  |
Number of Contracts | 2 |  | 2 |  | 2
Nonaccrual Status | 2,198 |  | 2,198 |  | 2,294
Total Modifications | 2,198 |  | 2,198 |  | 2,294
Real Estate Commercial [Member] |  |  |  |  |
Information concerning trouble debt restructurings by major loan category [Abstract] |  |  |  |  |
Number of Contracts | 1 |  | 1 |  | 1
Accrual Status | 1,654 |  | 1,654 |  | 1,667
Total Modifications | 1,654 |  | 1,654 |  | 1,667
Commercial [Member] |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 3,965 | 4,996 | 3,965 | 4,996 | 4,316
With an allowance recorded, Total | 2,685 | 3,953 | 2,685 | 3,953 | 4,117
Total | 6,650 | 8,949 | 6,650 | 8,949 | 8,433
Unpaid Principal Balance [Abstract] |  |  |  |  |
With no related allowance, Total | 3,965 | 4,996 | 3,965 | 4,996 | 4,316
With an allowance recorded, Total | 2,685 | 3,953 | 2,685 | 3,953 | 4,117
Total | 6,650 | 8,949 | 6,650 | 8,949 | 8,433
Related Allowance [Abstract] |  |  |  |  |
With an allowance recorded, Total | 485 | 1,136 | 485 | 1,136 | 698
Average Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 4,220 | 5,796 | 4,382 | 6,276 | 5,759
With an allowance recorded, Total | 2,776 | 3,036 | 3,425 | 2,535 | 3,504
Total | 6,996 | 8,832 | 7,807 | 8,811 | 9,263
Interest Income Recognized [Abstract] |  |  |  |  |
With no related allowance, Total | 16 | 65 | 32 | 170 | 198
With an allowance recorded, Total | 41 | 13 | 45 | 21 | 46
Total | 57 | 78 | 77 | 191 | 244
Real Estate Commercial [Member] |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 980 | 4,096 | 980 | 4,096 | 4,136
With an allowance recorded, Total | 3,819 | 2,056 | 3,819 | 2,056 | 3,696
Total | 4,799 | 6,152 | 4,799 | 6,152 | 7,832
Unpaid Principal Balance [Abstract] |  |  |  |  |
With no related allowance, Total | 980 | 4,096 | 980 | 4,096 | 4,136
With an allowance recorded, Total | 3,819 | 2,056 | 3,819 | 2,056 | 3,696
Total | 4,799 | 6,152 | 4,799 | 6,152 | 7,832
Related Allowance [Abstract] |  |  |  |  |
With an allowance recorded, Total | 122 | 52 | 122 | 52 | 40
Average Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 1,006 | 4,137 | 1,005 | 4,010 | 4,123
With an allowance recorded, Total | 3,741 | 2,061 | 3,739 | 2,144 | 2,940
Total | 4,747 | 6,198 | 4,744 | 6,154 | 7,063
Interest Income Recognized [Abstract] |  |  |  |  |
With no related allowance, Total | 58 | 63 | 78 | 99 | 187
With an allowance recorded, Total | 7 | 33 | 64 | 66 | 233
Total | 65 | 96 | 142 | 165 | 420
Real Estate Residential [Member] |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 706 | 1,076 | 706 | 1,076 | 889
With an allowance recorded, Total | 712 |  | 712 |  | 337
Total | 1,418 | 1,076 | 1,418 | 1,076 | 1,226
Unpaid Principal Balance [Abstract] |  |  |  |  |
With no related allowance, Total | 706 | 1,076 | 706 | 1,076 | 889
With an allowance recorded, Total | 712 |  | 712 |  | 337
Total | 1,418 | 1,076 | 1,418 | 1,076 | 1,226
Related Allowance [Abstract] |  |  |  |  |
With an allowance recorded, Total | 118 |  | 118 |  | 71
Average Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total | 803 | 1,024 | 782 | 925 | 948
With an allowance recorded, Total | 763 |  | 575 |  | 108
Total | 1,566 | 1,024 | 1,357 | 925 | 1,056
Interest Income Recognized [Abstract] |  |  |  |  |
With an allowance recorded, Total |  |  |  |  | 11
Total |  |  |  |  | 11
Consumer [Member] |  |  |  |  |
Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total |  | 12 |  | 12 |
With an allowance recorded, Total | 1 | 9 | 1 | 9 | 1
Total | 1 | 21 | 1 | 21 | 1
Unpaid Principal Balance [Abstract] |  |  |  |  |
With no related allowance, Total |  | 12 |  | 12 |
With an allowance recorded, Total | 1 | 9 | 1 | 9 | 1
Total | 1 | 21 | 1 | 21 | 1
Related Allowance [Abstract] |  |  |  |  |
With an allowance recorded, Total | 1 | 9 | 1 | 9 | 1
Average Recorded Investment [Abstract] |  |  |  |  |
With no related allowance, Total |  | 12 |  | 13 | 10
With an allowance recorded, Total | 1 | 9 | 1 | 9 | 8
Total | 1 | 21 | 1 | 22 | 18
Interest Income Recognized [Abstract] |  |  |  |  |
With no related allowance, Total |  | 1 |  | 1 | 1
Total |  | $ 1 |  | $ 1 | $ 1

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