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Investment securities available-for-sale (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Security
Dec. 31, 2012
Security
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 150,934 $ 140,392
Gross Unrealized Gains 4,778 8,132
Gross Unrealized Losses 696 744
Fair Value 155,016 147,780
Maturity distribution of debt securities classified as available-for-sale [Abstract]    
Within one year 1,518  
After one but within five years 38,096  
After five but within ten years 30,045  
After ten years 30,818  
Total debt securities with maturity date 100,477  
Mortgage-backed securities 53,988  
Total 154,465  
Carrying value of securities pledged 103,457 89,699
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 30,657 33,459
12 Months or More, Fair Value 3,202 7,878
Total, Fair Value 33,859 41,337
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 589 356
12 Months or More, Unrealized Losses 107 388
Total, Unrealized Losses 696 744
Number of investment securities held 49 59
U.S. Government-sponsored enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 29,147 29,375
Gross Unrealized Gains 2,169 3,556
Fair Value 31,316 32,931
Maturity distribution of debt securities classified as available-for-sale [Abstract]    
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer (in hundredths) 10.00% 10.00%
State and municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,139 16,611
Gross Unrealized Gains 967 2,083
Gross Unrealized Losses 3  
Fair Value 17,103 18,694
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 497  
Total, Fair Value 497  
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 3  
Total, Unrealized Losses 3  
Number of investment securities held 1  
State and municipals, Tax-exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 47,263 45,480
Gross Unrealized Gains 880 2,035
Gross Unrealized Losses 384 127
Fair Value 47,759 47,388
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 13,828 12,483
Total, Fair Value 13,828 12,483
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 384 127
Total, Unrealized Losses 384 127
Number of investment securities held 37 36
Corporate debt securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,034 4,038
Gross Unrealized Gains 265 139
Gross Unrealized Losses   306
Fair Value 4,299 3,871
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
12 Months or More, Fair Value   2,705
Total, Fair Value   2,705
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
12 Months or More, Unrealized Losses   306
Total, Unrealized Losses   306
Number of investment securities held   2
Number of securities in continuous unrealized loss position 12 months or longer   1
Mortgage-backed securities, U.S. Government agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 21,144 21,532
Gross Unrealized Gains 156 173
Gross Unrealized Losses 190 151
Fair Value 21,110 21,554
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 9,753 11,934
12 Months or More, Fair Value   838
Total, Fair Value 9,753 12,772
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 190 146
12 Months or More, Unrealized Losses   5
Total, Unrealized Losses 190 151
Number of investment securities held 9 19
Number of securities in continuous unrealized loss position 12 months or longer 2 7
Mortgage-backed securities, U.S. Government-sponsored enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,720 22,868
Gross Unrealized Gains 256 129
Gross Unrealized Losses 98 129
Fair Value 32,878 22,868
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
Less than 12 Months, Fair Value 6,579 9,042
12 Months or More, Fair Value 3,086 4,229
Total, Fair Value 9,665 13,271
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
Less than 12 Months, Unrealized Losses 12 83
12 Months or More, Unrealized Losses 86 46
Total, Unrealized Losses 98 129
Equity securities, Common [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 487 488
Gross Unrealized Gains 85 17
Gross Unrealized Losses 21 31
Fair Value 551 474
Investment securities available-for-sale in a continuous unrealized loss position, fair value [Abstract]    
12 Months or More, Fair Value 116 106
Total, Fair Value 116 106
Investment securities available-for-sale in a continuous unrealized loss position, unrealized losses [Abstract]    
12 Months or More, Unrealized Losses 21 31
Total, Unrealized Losses $ 21 $ 31
Number of investment securities held 2 2
Number of securities in continuous unrealized loss position 12 months or longer 2 1