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Recorded Investment in Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance $ 302,651 $ 293,087
Accrued interest receivable 958 1,050
Net deferred loan origination fees and costs 412 341
Recorded investment in loans 304,021 294,478
Individually evaluated for impairment 6,190 6,920
Collectively evaluated for impairment 297,831 287,558
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 304,021 294,478
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 105,377 107,029
Accrued interest receivable 347 427
Net deferred loan origination fees and costs 59 52
Recorded investment in loans 105,783 107,508
Individually evaluated for impairment 1,446 2,040
Collectively evaluated for impairment 104,337 105,468
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 105,783 107,508
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 9,938 10,309
Accrued interest receivable 45 49
Net deferred loan origination fees and costs 2 2
Recorded investment in loans 9,985 10,360
Individually evaluated for impairment 113 120
Collectively evaluated for impairment 9,872 10,240
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 9,985 10,360
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 8,993 8,996
Accrued interest receivable 22 22
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 9,015 9,018
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 9,015 9,018
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 9,015 9,018
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 78,547 76,496
Accrued interest receivable 202 202
Net deferred loan origination fees and costs (30) (32)
Recorded investment in loans 78,719 76,666
Individually evaluated for impairment 2,671 2,586
Collectively evaluated for impairment 76,048 74,080
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 78,719 76,666
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 28,354 21,956
Accrued interest receivable 77 56
Net deferred loan origination fees and costs (9) (9)
Recorded investment in loans 28,422 22,003
Individually evaluated for impairment 1,864 1,898
Collectively evaluated for impairment 26,558 20,105
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 28,422 22,003
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 36,833 34,815
Accrued interest receivable 129 126
Net deferred loan origination fees and costs 390 328
Recorded investment in loans 37,352 35,269
Individually evaluated for impairment 96 276
Collectively evaluated for impairment 37,256 34,993
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 37,352 35,269
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 34,609 33,486
Accrued interest receivable 136 168
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 34,745 33,654
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 34,745 33,654
Acquired with deteriorated credit quality 0 0
Recorded investment in loans $ 34,745 $ 33,654