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Investment securities available-for-sale (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 121,688 $ 134,376
Gross Unrealized Gains 7,696 7,072
Gross Unrealized Losses 788 1,549
Fair Value 128,596 139,899
Maturity distribution of debt securities classified as available-for-sale [Abstract]    
Within one year 250  
After one but within five years 14,855  
After five but within ten years 35,483  
After ten years 39,897  
Total debt securities with maturity date 90,485  
Mortgage-backed securities 37,641  
Total 128,126  
Carrying value of securities pledged 89,099 105,135
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 14,008 34,722
12 Months or More, Fair Value 8,267 5,184
Total, Fair Value 22,275 39,906
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 108 399
12 Months or More, Unrealized Losses 680 1,150
Total, Unrealized Losses 788 1,549
Number of investment securities held 20 31
U.S. Government-sponsored enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 29,524 29,671
Gross Unrealized Gains 3,491 3,105
Fair Value 33,015 32,776
State and municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,623 18,120
Gross Unrealized Gains 1,859 1,608
Fair Value 18,482 19,728
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Number of securities in continuous unrealized loss position 12 months or longer 1 4
State and municipals, Tax-exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 33,551 38,217
Gross Unrealized Gains 1,955 1,693
Gross Unrealized Losses 9 224
Fair Value 35,497 39,686
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 1,176 1,142
12 Months or More, Fair Value 300 2,859
Total, Fair Value 1,476 4,001
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 6 39
12 Months or More, Unrealized Losses 3 185
Total, Unrealized Losses 9 224
Number of investment securities held 3 6
Corporate debt securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,040 4,462
Gross Unrealized Gains 45 330
Gross Unrealized Losses 594 942
Fair Value 3,491 3,850
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value   970
12 Months or More, Fair Value 2,417 2,130
Total, Fair Value 2,417 3,100
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses   61
12 Months or More, Unrealized Losses 594 881
Total, Unrealized Losses 594 942
Number of investment securities held 2 3
Number of securities in continuous unrealized loss position 12 months or longer 2 2
Mortgage-backed securities, U.S. Government agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,288 16,827
Gross Unrealized Gains 189 185
Gross Unrealized Losses 30 100
Fair Value 15,447 16,912
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 3,538 10,785
12 Months or More, Fair Value 2,801  
Total, Fair Value 6,339 10,785
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 13 100
12 Months or More, Unrealized Losses 17  
Total, Unrealized Losses 30 100
Number of investment securities held 13 18
Number of securities in continuous unrealized loss position 12 months or longer 4  
Mortgage-backed securities, U.S. Government-sponsored enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 22,175 26,396
Gross Unrealized Gains 135 66
Gross Unrealized Losses 116 199
Fair Value 22,194 26,263
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 9,294 21,825
12 Months or More, Fair Value 2,651  
Total, Fair Value 11,945 21,825
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 89 199
12 Months or More, Unrealized Losses 27  
Total, Unrealized Losses 116 199
Equity securities, Preferred [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   54
Gross Unrealized Gains   63
Fair Value   117
Equity securities, Common [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 487 629
Gross Unrealized Gains 22 22
Gross Unrealized Losses 39 84
Fair Value 470 567
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
12 Months or More, Fair Value 98 195
Total, Fair Value 98 195
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
12 Months or More, Unrealized Losses 39 84
Total, Unrealized Losses $ 39 $ 84
Number of investment securities held 2 4
Number of securities in continuous unrealized loss position 12 months or longer 2