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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 16,059 $ 20,806
12 Months or less, Unrealized Loss (130) (57)
More than 12 months, Fair Value 10,307 29,027
More than 12 months, Unrealized Loss (100) (552)
Total Fair Value 26,366 49,833
Total Unrealized Loss (230) (609)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 2,037 7,664
12 Months or less, Unrealized Loss   (17)
More than 12 months, Fair Value 1,192 11,888
More than 12 months, Unrealized Loss (13) (106)
Total Fair Value 3,229 19,552
Total Unrealized Loss (13) (123)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 7,866 853
12 Months or less, Unrealized Loss (93) (11)
More than 12 months, Fair Value 1,466 5,647
More than 12 months, Unrealized Loss (50) (295)
Total Fair Value 9,332 6,500
Total Unrealized Loss (143) (306)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 6,156 12,289
12 Months or less, Unrealized Loss (37) (29)
More than 12 months, Fair Value 7,649 11,492
More than 12 months, Unrealized Loss (37) (151)
Total Fair Value 13,805 23,781
Total Unrealized Loss $ (74) $ (180)