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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) | Jun. 30, 2016 USD ($) security | Dec. 31, 2015 USD ($) 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 | 1 | 23
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 70,000 | $ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (1,000) | $ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 3
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (414,000)
Available-for-sale, Securities, Number of Positions | security | 1 | 26
Available-for-sale Securities, Fair Value, Total | $ 70,000 | $ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,000) | $ (1,716,000)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 |
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 |
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 |
Available-for-sale, Securities, Number of Positions | security | 0 |
Available-for-sale Securities, Fair Value, Total | $ 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 |
Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 10
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 88,584,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (379,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 2
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 14,542,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (188,000)
Available-for-sale, Securities, Number of Positions | security | 0 | 12
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 103,126,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (567,000)
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 6
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 61,211,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (316,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Available-for-sale, Securities, Number of Positions | security | 0 | 6
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 61,211,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (316,000)
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 7,993,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (151,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Available-for-sale, Securities, Number of Positions | security | 0 | 1
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 7,993,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (151,000)
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 5
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 50,839,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (450,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 1
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 9,472,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (226,000)
Available-for-sale, Securities, Number of Positions | security | 0 | 6
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 60,311,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (676,000)
Obligations of States and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 5,370,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (6,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Available-for-sale, Securities, Number of Positions | security | 0 | 1
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 5,370,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (6,000)
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 23
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 | 3
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 | $ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (414,000)
Available-for-sale, Securities, Number of Positions | security | 0 | 26
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (1,716,000)
Marketable Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 1 |
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 70,000 |
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (1,000) |
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 0 |
Available-for-sale Securities, 12 Months or More, Fair Value | $ 0 |
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 |
Available-for-sale, Securities, Number of Positions | security | 1 | 1
Available-for-sale Securities, Fair Value, Total | $ 70,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,000) | $ 0

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