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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) $ in Thousands | Jun. 30, 2015 USD ($) security | Dec. 31, 2014 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 20 | 7
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 125,424 | $ 59,329
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (1,233) | $ (381)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 5 | 13
Available-for-sale Securities, 12 Months or More, Fair Value | $ 39,643 | $ 103,527
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (405) | $ (1,456)
Available-for-sale, Securities, Number of Positions | security | 25 | 20
Available-for-sale Securities, Fair Value, Total | $ 165,067 | $ 162,856
Available-for-sale Securities, Unrealized Losses, Total | $ (1,638) | $ (1,837)
Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 4 | 4
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 33,489 | $ 39,745
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (215) | $ (207)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 4 | 8
Available-for-sale Securities, 12 Months or More, Fair Value | $ 30,033 | $ 63,149
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (212) | $ (871)
Available-for-sale, Securities, Number of Positions | security | 8 | 12
Available-for-sale Securities, Fair Value, Total | $ 63,522 | $ 102,894
Available-for-sale Securities, Unrealized Losses, Total | $ (427) | $ (1,078)
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 2 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 17,288 | $ 9,323
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (132) | $ (148)
Available-for-sale, Securities, Number of Positions | security | 2 | 1
Available-for-sale Securities, Fair Value, Total | $ 17,288 | $ 9,323
Available-for-sale Securities, Unrealized Losses, Total | $ (132) | $ (148)
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 2 |
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 10,704 |
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (186) |
Available-for-sale, Securities, 12 Months or More, Number of Positions | security |  | 1
Available-for-sale Securities, 12 Months or More, Fair Value |  | $ 8,982
Available-for-sale Securities, 12 Months or More, Unrealized Losses |  | $ (154)
Available-for-sale, Securities, Number of Positions | security | 2 | 1
Available-for-sale Securities, Fair Value, Total | $ 10,704 | $ 8,982
Available-for-sale Securities, Unrealized Losses, Total | $ (186) | $ (154)
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 2 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 20,976 | $ 9,998
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (180) | $ (25)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 1 | 2
Available-for-sale Securities, 12 Months or More, Fair Value | $ 9,610 | $ 20,640
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (193) | $ (368)
Available-for-sale, Securities, Number of Positions | security | 3 | 3
Available-for-sale Securities, Fair Value, Total | $ 30,586 | $ 30,638
Available-for-sale Securities, Unrealized Losses, Total | $ (373) | $ (393)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 10 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 42,967 | $ 263
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (520) | $ (1)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security |  | 2
Available-for-sale Securities, 12 Months or More, Fair Value |  | $ 10,756
Available-for-sale Securities, 12 Months or More, Unrealized Losses |  | $ (63)
Available-for-sale, Securities, Number of Positions | security | 10 | 3
Available-for-sale Securities, Fair Value, Total | $ 42,967 | $ 11,019
Available-for-sale Securities, Unrealized Losses, Total | $ (520) | $ (64)

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