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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