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Loan Receivables and Allowance for Loan Losses - Credit Risk Exposure of Loans Receivable, by Loan Type and Credit Quality Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Total $ 419,838 $ 423,058
Loan to Value Ratio Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 654 650
Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 394,595 394,893
Pass [Member] | Loan to Value Ratio Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 654 650
Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 8,410 9,242
Special Mention [Member] | Loan to Value Ratio Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 16,833 18,923
Substandard [Member] | Loan to Value Ratio Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 409,672 410,750
Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 10,166 12,308
Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 38,752 35,061
Commercial [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 34,992 31,163
Commercial [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,760 3,898
Commercial [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 31,103 27,391
Commercial [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 27,343 23,493
Commercial [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,760 3,898
Commercial [Member] | Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 159 167
Commercial [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 159 167
Commercial [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Commercial [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 7,490 7,503
Commercial [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 7,490 7,503
Commercial [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Commercial [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 32,700 28,909
Commercial [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 6,052 6,152
Commercial Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 218,051 223,165
Commercial Real Estate [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 205,087 209,381
Commercial Real Estate [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 12,964 13,784
Commercial Real Estate [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 202,828 207,068
Commercial Real Estate [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 195,649 199,118
Commercial Real Estate [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 7,178 7,951
Commercial Real Estate [Member] | Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 8,251 9,075
Commercial Real Estate [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 5,774 6,573
Commercial Real Estate [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 2,477 2,502
Commercial Real Estate [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 6,972 7,022
Commercial Real Estate [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,664 3,690
Commercial Real Estate [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,309 3,331
Commercial Real Estate [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 216,302 221,401
Commercial Real Estate [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 1,749 1,764
Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 260 260
Construction [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 60 60
Construction [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 200 200
Construction [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 260 260
Construction [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 60 60
Construction [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 200 200
Construction [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 260 260
Construction to Permanent [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 12,650 11,303
Construction to Permanent [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 8,050 11,303
Construction to Permanent [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 4,600   
Construction to Permanent [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 12,650 10,106
Construction to Permanent [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 8,050 10,106
Construction to Permanent [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 4,600   
Construction to Permanent [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction to Permanent [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction to Permanent [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total   1,197
Construction to Permanent [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total    1,197
Construction to Permanent [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Construction to Permanent [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 12,650 10,106
Construction to Permanent [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total    1,197
Residential Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 103,019 106,198
Residential Real Estate [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 82,880 84,680
Residential Real Estate [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 20,139 21,518
Residential Real Estate [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 100,944 103,296
Residential Real Estate [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 81,304 82,704
Residential Real Estate [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 19,640 20,592
Residential Real Estate [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Residential Real Estate [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Residential Real Estate [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 2,075 2,902
Residential Real Estate [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 1,576 1,976
Residential Real Estate [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 499 926
Residential Real Estate [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 100,944 103,296
Residential Real Estate [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 2,075 2,902
Consumer [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 47,106 47,071
Consumer [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 42,696 42,551
Consumer [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,756 3,870
Consumer [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 47,071 47,031
Consumer [Member] | Pass [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 42,661 42,542
Consumer [Member] | Pass [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 3,756 3,839
Consumer [Member] | Special Mention [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Consumer [Member] | Special Mention [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total      
Consumer [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 35 40
Consumer [Member] | Substandard [Member] | Less than 75% Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 35 9
Consumer [Member] | Substandard [Member] | 75% or more Loan to Value Ratio [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total    31
Consumer [Member] | Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total 47,076 47,038
Consumer [Member] | Non Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total $ 30 $ 33