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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value $ 27,260 $ 9,392
Securities available for sale, 12 months or more - Fair Value 19,172 35,368
Securities available for sale, Total - Fair Value 46,432 44,760
Securities available for sale, Less than 12 months - Unrealized (Loss) (140) (61)
Securities available for sale, 12 months or more - Unrealized (Loss) (373) (845)
Total Unrealized (Loss) (513) (906)
Securities held to maturity, Less than 12 months - Fair Value 19,612  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 19,612  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (165)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) (165)  
Total securities, Less than 12 months - Fair Value 46,872  
Total securities, 12 months or more - Fair Value 19,172  
Total securities, Total - Fair Value 66,044  
Total securities, Less than 12 months - Unrealized (Loss) (305)  
Total securities, 12 months or more - Unrealized (Loss) (373)  
Total Unrealized (Loss) (678)  
U.S. Agency and Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value 24,974 8,677
Securities available for sale, 12 months or more - Fair Value 18,114 32,527
Securities available for sale, Total - Fair Value 43,088 41,204
Securities available for sale, Less than 12 months - Unrealized (Loss) (125) (60)
Securities available for sale, 12 months or more - Unrealized (Loss) (338) (747)
Total Unrealized (Loss) (463) (807)
Securities held to maturity, Less than 12 months - Fair Value 14,612  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 14,612  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (124)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) (124)  
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value 2,286 715
Securities available for sale, 12 months or more - Fair Value 1,058 2,841
Securities available for sale, Total - Fair Value 3,344 3,556
Securities available for sale, Less than 12 months - Unrealized (Loss) (15) (1)
Securities available for sale, 12 months or more - Unrealized (Loss) (35) (98)
Total Unrealized (Loss) (50) $ (99)
Securities held to maturity, Less than 12 months - Fair Value 5,000  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 5,000  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (41)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) $ (41)