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Loans, credit risk (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 642,815 $ 670,497
Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 86,498 93,812
Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 255,339 267,051
Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 207,245 214,415
Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,285 4,793
Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 59,416 60,646
Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,205 10,490
All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 18,827 19,290
Total real estate loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 554,367 580,071
1- Excellent Quality [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 24,840 27,730
1- Excellent Quality [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 193 197
1- Excellent Quality [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 22,425 25,474
1- Excellent Quality [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
1- Excellent Quality [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
1- Excellent Quality [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 902 715
1- Excellent Quality [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,320 1,344
1- Excellent Quality [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
2- High Quality [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 106,483 111,201
2- High Quality [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,506 5,183
2- High Quality [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 61,133 64,817
2- High Quality [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 24,729 25,506
2- High Quality [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 41 50
2- High Quality [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,293 8,801
2- High Quality [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,170 4,070
2- High Quality [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,611 2,774
3- Good Quality [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 304,915 325,001
3- Good Quality [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 26,624 27,675
3- Good Quality [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 94,484 100,388
3- Good Quality [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 123,709 136,137
3- Good Quality [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,637 3,448
3- Good Quality [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 36,186 36,585
3- Good Quality [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 4,065 4,259
3- Good Quality [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 16,210 16,509
4- Management Attention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 133,968 132,379
4- Management Attention [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 26,320 28,138
4- Management Attention [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 46,754 50,253
4- Management Attention [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 47,325 40,312
4- Management Attention [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 686 358
4- Management Attention [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 12,503 12,882
4- Management Attention [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 374 429
4- Management Attention [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6 7
5- Watch [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 29,985 31,924
5- Watch [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,861 15,923
5- Watch [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 11,701 11,767
5- Watch [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,263 2,795
5- Watch [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 720 728
5- Watch [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 325 622
5- Watch [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 115 89
5- Watch [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
6- Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 42,599 42,117
6- Substandard [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 15,994 16,696
6- Substandard [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 18,842 14,352
6- Substandard [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,219 9,665
6- Substandard [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 201 209
6- Substandard [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,182 1,041
6- Substandard [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 161 154
6- Substandard [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
7- Low Substandard [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
8- Doubtful [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
9- Loss [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 25 145
9- Loss [Member] | Real Estate Loans - Construction and Land Development [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
9- Loss [Member] | Real Estate Loans - Single-Family Residential [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
9- Loss [Member] | Real Estate Loans - Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
9- Loss [Member] | Real estate loans - Multifamily and Farmland [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
9- Loss [Member] | Commercial (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 25 0
9- Loss [Member] | Consumer (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 145
9- Loss [Member] | All other loans (not secured by real estate) [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 0 $ 0