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Allowance for Loan Losses (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Ending allowance balance attributable to loans:          
Individually evaluated for impairment $ 1,622,000   $ 1,622,000   $ 1,658,000
Collectively evaluated for impairment 2,810,000   2,810,000   2,524,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 4,432,000 4,561,000 4,432,000 4,561,000  
Allowance for loan losses:          
Beginning balance 4,228,000 4,577,000 4,182,000 4,473,000  
Provisions for loan losses 300,000 425,000 775,000 925,000  
Charge-offs (152,000) (498,000) (638,000) (984,000)  
Recoveries 56,000 57,000 113,000 147,000  
Ending balance 4,432,000 4,561,000 4,432,000 4,561,000  
Residential
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 231,000   231,000   183,000
Collectively evaluated for impairment 942,000   942,000   645,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 1,173,000 1,217,000 1,173,000 1,217,000  
Allowance for loan losses:          
Beginning balance 1,060,000 992,000 828,000 1,024,000  
Provisions for loan losses 147,000 223,000 646,000 454,000  
Charge-offs (35,000) (1,000) (312,000) (265,000)  
Recoveries 1,000 3,000 11,000 4,000  
Ending balance 1,173,000 1,217,000 1,173,000 1,217,000  
Land
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 102,000   102,000   93,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 102,000 59,000 102,000 59,000  
Allowance for loan losses:          
Beginning balance 99,000 79,000 93,000 55,000  
Provisions for loan losses 3,000 (20,000) 12,000 4,000  
Charge-offs 0 0 (4,000) 0  
Recoveries 0 0 1,000 0  
Ending balance 102,000 59,000 102,000 59,000  
Construction
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 40,000   40,000   33,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 40,000 26,000 40,000 26,000  
Allowance for loan losses:          
Beginning balance 35,000 39,000 33,000 21,000  
Provisions for loan losses 5,000 (13,000) 7,000 5,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 40,000 26,000 40,000 26,000  
Commercial Real Estate
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 348,000   348,000   539,000
Collectively evaluated for impairment 478,000   478,000   730,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 826,000 1,271,000 826,000 1,271,000  
Allowance for loan losses:          
Beginning balance 924,000 1,248,000 1,269,000 1,051,000  
Provisions for loan losses (98,000) 91,000 (443,000) 288,000  
Charge-offs 0 (68,000) 0 (68,000)  
Recoveries 0 0 0 0  
Ending balance 826,000 1,271,000 826,000 1,271,000  
Commercial Business
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 914,000   914,000   936,000
Collectively evaluated for impairment 240,000   240,000   224,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 1,154,000 1,020,000 1,154,000 1,020,000  
Allowance for loan losses:          
Beginning balance 1,175,000 1,211,000 1,160,000 1,251,000  
Provisions for loan losses (22,000) 112,000 (10,000) 70,000  
Charge-offs 0 (305,000) 0 (305,000)  
Recoveries 1,000 2,000 4,000 4,000  
Ending balance 1,154,000 1,020,000 1,154,000 1,020,000  
Home Equity and Second Mortgage
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 129,000   129,000   0
Collectively evaluated for impairment 711,000   711,000   400,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 840,000 562,000 840,000 562,000  
Allowance for loan losses:          
Beginning balance 651,000 562,000 400,000 606,000  
Provisions for loan losses 246,000 46,000 607,000 133,000  
Charge-offs (62,000) (51,000) (176,000) (208,000)  
Recoveries 5,000 5,000 9,000 31,000  
Ending balance 840,000 562,000 840,000 562,000  
Other Consumer
          
Ending allowance balance attributable to loans:          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 297,000   297,000   399,000
Acquired with deteriorated credit quality 0   0   0
Ending balance 297,000 406,000 297,000 406,000  
Allowance for loan losses:          
Beginning balance 284,000 446,000 399,000 465,000  
Provisions for loan losses 19,000 (14,000) (44,000) (29,000)  
Charge-offs (55,000) (73,000) (146,000) (138,000)  
Recoveries 49,000 47,000 88,000 108,000  
Ending balance $ 297,000 $ 406,000 $ 297,000 $ 406,000