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Recorded Investment in Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance $ 291,869 $ 293,087
Accrued interest receivable 917 1,050
Net deferred loan origination fees and costs 366 341
Recorded investment in loans 293,152 294,478
Individually evaluated for impairment 6,587 6,920
Collectively evaluated for impairment 286,565 287,558
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 293,152 294,478
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 106,252 107,029
Accrued interest receivable 395 427
Net deferred loan origination fees and costs 56 52
Recorded investment in loans 106,703 107,508
Individually evaluated for impairment 1,638 2,040
Collectively evaluated for impairment 105,065 105,468
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 106,703 107,508
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 10,082 10,309
Accrued interest receivable 36 49
Net deferred loan origination fees and costs 2 2
Recorded investment in loans 10,120 10,360
Individually evaluated for impairment 118 120
Collectively evaluated for impairment 10,002 10,240
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 10,120 10,360
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 9,664 8,996
Accrued interest receivable 19 22
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 9,683 9,018
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 9,683 9,018
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 9,683 9,018
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 77,764 76,496
Accrued interest receivable 166 202
Net deferred loan origination fees and costs (32) (32)
Recorded investment in loans 77,898 76,666
Individually evaluated for impairment 2,723 2,586
Collectively evaluated for impairment 75,175 74,080
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 77,898 76,666
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 21,201 21,956
Accrued interest receivable 52 56
Net deferred loan origination fees and costs (9) (9)
Recorded investment in loans 21,244 22,003
Individually evaluated for impairment 1,898 1,898
Collectively evaluated for impairment 19,346 20,105
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 21,244 22,003
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 34,482 34,815
Accrued interest receivable 124 126
Net deferred loan origination fees and costs 349 328
Recorded investment in loans 34,955 35,269
Individually evaluated for impairment 210 276
Collectively evaluated for impairment 34,745 34,993
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 34,955 35,269
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 32,424 33,486
Accrued interest receivable 125 168
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 32,549 33,654
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 32,549 33,654
Acquired with deteriorated credit quality 0 0
Recorded investment in loans $ 32,549 $ 33,654