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Investment Securities - Amortized Cost and Estimated Fair Value by Maturity of Company's Investment Securities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities available for sale, One Year or Less, Fair Value $ 3,128,000  
Securities available for sale, After One Year through Five Years, Fair Value 10,382,000  
Securities available for sale, After Five Years through Ten Years, Fair Value 37,749,000  
Securities available for sale, After Ten Years, Fair Value 98,373,000  
Total Available for sale, Fair Value 149,632,153 157,255,828
Securities held to maturity, One Year or Less, Fair Value 349,000  
Securities held to maturity, One Year to Five Years, Fair Value 797,000  
Securities held to maturity, Five to Ten Years, Fair Value 6,886,000  
Securities held to maturity, Over Ten Years, Fair Value 1,243,000  
Total held to maturity, Fair Value 9,275,158 1,746,375
Securities available for sale, Amortized Cost, One Year or Less 3,111,000  
Securities available for sale, Amortized Cost, After One Year Through Five Years 10,182,000  
Securities available for sale, Amortized Cost, After Five Years Through Ten Years 38,447,000  
Securities available for sale, Amortized Cost, After Ten Years 97,592,000  
Securities available for sale, Amortized Cost, Total 149,332,000 152,350,000
Securities held to maturity, Amortized Cost, One Year or Less 347,000  
Securities held to maturity, Amortized Cost, One Year to Five Years 756,000  
Securities held to maturity, Amortized Cost, Five to Ten Years 7,041,000  
Securities held to maturity, Amortized Cost, Over Ten Years 1,261,000  
Securities held to maturity, Amortized Cost, Total 9,404,790 1,665,184
U.S. Agency Mortgage-Backed [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities available for sale, One Year or Less, Fair Value 113,000  
Securities available for sale, After One Year through Five Years, Fair Value 231,000  
Securities available for sale, After Five Years through Ten Years, Fair Value 15,665,000  
Securities available for sale, After Ten Years, Fair Value 80,776,000  
Total Available for sale, Fair Value 96,785,000 102,513,000
Securities held to maturity, One Year or Less, Fair Value 133,000  
Securities held to maturity, One Year to Five Years, Fair Value     
Securities held to maturity, Five to Ten Years, Fair Value     
Securities held to maturity, Over Ten Years, Fair Value     
Total held to maturity, Fair Value 133,000 706,000
Securities available for sale, Amortized Cost, One Year or Less 108,000  
Securities available for sale, Amortized Cost, After One Year Through Five Years 214,000  
Securities available for sale, Amortized Cost, After Five Years Through Ten Years 15,696,000  
Securities available for sale, Amortized Cost, After Ten Years 80,127,000  
Securities available for sale, Amortized Cost, Total 96,145,000 99,137,000
Securities held to maturity, Amortized Cost, One Year or Less 132,000  
Securities held to maturity, Amortized Cost, One Year to Five Years     
Securities held to maturity, Amortized Cost, Five to Ten Years     
Securities held to maturity, Amortized Cost, Over Ten Years     
Securities held to maturity, Amortized Cost, Total 132,000  
Municipal Bonds [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities available for sale, One Year or Less, Fair Value 503,000  
Securities available for sale, After One Year through Five Years, Fair Value 4,858,000  
Securities available for sale, After Five Years through Ten Years, Fair Value 11,574,000  
Securities available for sale, After Ten Years, Fair Value 2,864,000  
Total Available for sale, Fair Value 19,799,000 17,585,000
Securities held to maturity, One Year or Less, Fair Value 216,000  
Securities held to maturity, One Year to Five Years, Fair Value 797,000  
Securities held to maturity, Five to Ten Years, Fair Value 6,886,000  
Securities held to maturity, Over Ten Years, Fair Value 1,243,000  
Total held to maturity, Fair Value 9,142,000 1,040,000
Securities available for sale, Amortized Cost, One Year or Less 503,000  
Securities available for sale, Amortized Cost, After One Year Through Five Years 4,743,000  
Securities available for sale, Amortized Cost, After Five Years Through Ten Years 11,761,000  
Securities available for sale, Amortized Cost, After Ten Years 2,872,000  
Securities available for sale, Amortized Cost, Total 19,879,000 16,843,000
Securities held to maturity, Amortized Cost, One Year or Less 215,000  
Securities held to maturity, Amortized Cost, One Year to Five Years 756,000  
Securities held to maturity, Amortized Cost, Five to Ten Years 7,041,000  
Securities held to maturity, Amortized Cost, Over Ten Years 1,261,000  
Securities held to maturity, Amortized Cost, Total 9,273,000  
Non-U.S. Agency Mortgage-Backed [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities available for sale, One Year or Less, Fair Value     
Securities available for sale, After One Year through Five Years, Fair Value     
Securities available for sale, After Five Years through Ten Years, Fair Value     
Securities available for sale, After Ten Years, Fair Value 9,749,000  
Total Available for sale, Fair Value 9,749,000 12,668,000
Securities available for sale, Amortized Cost, One Year or Less     
Securities available for sale, Amortized Cost, After One Year Through Five Years     
Securities available for sale, Amortized Cost, After Five Years Through Ten Years     
Securities available for sale, Amortized Cost, After Ten Years 9,765,000  
Securities available for sale, Amortized Cost, Total 9,765,000 12,426,000
U.S. Government Agency [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Securities available for sale, One Year or Less, Fair Value 2,512,000  
Securities available for sale, After One Year through Five Years, Fair Value 5,293,000  
Securities available for sale, After Five Years through Ten Years, Fair Value 10,510,000  
Securities available for sale, After Ten Years, Fair Value 4,984,000  
Total Available for sale, Fair Value 23,299,000 24,490,000
Securities available for sale, Amortized Cost, One Year or Less 2,500,000  
Securities available for sale, Amortized Cost, After One Year Through Five Years 5,225,000  
Securities available for sale, Amortized Cost, After Five Years Through Ten Years 10,990,000  
Securities available for sale, Amortized Cost, After Ten Years 4,828,000  
Securities available for sale, Amortized Cost, Total $ 23,543,000 $ 23,944,000