Loan Receivables and Allowance for Loan Losses - Credit Risk Exposure of Loans Receivable, by Loan Type and Credit Quality Indicator (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
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 |