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Fair Value Disclosures (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Fair Value Disclosures      
Threshold loan amount above which the entity measures loan impairment $ 100,000    
Stock:      
Federal Reserve Bank and FHLB stock, at cost 12,191,000 12,475,000 12,982,000
Recurring basis | Fair Value Measurement Using: Level 1
     
Investment securities available for sale:      
Total securities available for sale 111,196,000   103,512,000
Stock:      
FHLB stock 10,172,000   10,963,000
Federal Reserve Bank stock 2,019,000   2,019,000
Federal Reserve Bank and FHLB stock, at cost 12,191,000   12,982,000
Total securities 123,387,000   116,494,000
Recurring basis | Fair Value Measurement Using: Level 1 | U.S. Treasury
     
Investment securities available for sale:      
Total securities available for sale 160,000   164,000
Recurring basis | Fair Value Measurement Using: Level 1 | Municipal bonds
     
Investment securities available for sale:      
Total securities available for sale 57,097,000   24,029,000
Recurring basis | Fair Value Measurement Using: Level 1 | Mortgage-backed securities
     
Investment securities available for sale:      
Total securities available for sale 53,939,000   79,319,000
Recurring basis | Fair Value Measurement Using: Level 2
     
Investment securities available for sale:      
Total securities available for sale 2,093,000   3,283,000
Stock:      
Total securities 2,093,000   3,283,000
Recurring basis | Fair Value Measurement Using: Level 2 | Mortgage-backed securities
     
Investment securities available for sale:      
Total securities available for sale 2,093,000   3,283,000
Recurring basis | Fair Value Measurement Using: Level 3
     
Investment securities available for sale:      
Total securities available for sale 961,000   966,000
Stock:      
Total securities 961,000   966,000
Recurring basis | Fair Value Measurement Using: Level 3 | Mortgage-backed securities
     
Investment securities available for sale:      
Total securities available for sale 961,000   966,000
Recurring basis | Securities at Fair Value
     
Investment securities available for sale:      
Total securities available for sale 114,250,000   107,761,000
Stock:      
FHLB stock 10,172,000   10,963,000
Federal Reserve Bank stock 2,019,000   2,019,000
Federal Reserve Bank and FHLB stock, at cost 12,191,000   12,982,000
Total securities 126,441,000   120,743,000
Recurring basis | Securities at Fair Value | U.S. Treasury
     
Investment securities available for sale:      
Total securities available for sale 160,000   164,000
Recurring basis | Securities at Fair Value | Municipal bonds
     
Investment securities available for sale:      
Total securities available for sale 57,097,000   24,029,000
Recurring basis | Securities at Fair Value | Mortgage-backed securities
     
Investment securities available for sale:      
Total securities available for sale $ 56,993,000   $ 83,568,000