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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value $ 51,733 $ 9,392
Securities available for sale, 12 months or more - Fair Value 21,864 35,368
Securities available for sale, Total - Fair Value 73,597 44,760
Securities available for sale, Less than 12 months - Unrealized (Loss) (585) (61)
Securities available for sale, 12 months or more - Unrealized (Loss) (593) (845)
Total Unrealized (Loss) (1,178) (906)
Securities held to maturity, Less than 12 months - Fair Value 31,445  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 31,445  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (494)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) (494)  
Total securities, Less than 12 months - Fair Value 83,178  
Total securities, 12 months or more - Fair Value 21,864  
Total securities, Total - Fair Value 105,042  
Total securities, Less than 12 months - Unrealized (Loss) (1,079)  
Total securities, 12 months or more - Unrealized (Loss) (593)  
Total Unrealized (Loss) (1,672)  
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 46,557 8,677
Securities available for sale, 12 months or more - Fair Value 20,815 32,527
Securities available for sale, Total - Fair Value 67,372 41,204
Securities available for sale, Less than 12 months - Unrealized (Loss) (537) (60)
Securities available for sale, 12 months or more - Unrealized (Loss) (545) (747)
Total Unrealized (Loss) (1,082) (807)
Securities held to maturity, Less than 12 months - Fair Value 26,882  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 26,882  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (404)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) (404)  
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 5,176 715
Securities available for sale, 12 months or more - Fair Value 1,049 2,841
Securities available for sale, Total - Fair Value 6,225 3,556
Securities available for sale, Less than 12 months - Unrealized (Loss) (48) (1)
Securities available for sale, 12 months or more - Unrealized (Loss) (48) (98)
Total Unrealized (Loss) (96) $ (99)
Securities held to maturity, Less than 12 months - Fair Value 4,563  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 4,563  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (90)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) $ (90)