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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) $ in Thousands | Sep. 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 | 2 | 23
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 7,912 | $ 213,997
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (8) | $ (1,302)
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
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (414)
Available-for-sale, Securities, Number of Positions | security | 2 | 26
Available-for-sale Securities, Fair Value, Total | $ 7,912 | $ 238,011
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (8) | $ (1,716)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 0 | 0
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 0 | $ 0
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ 0
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 | 0
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ 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
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (379)
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
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (188)
Available-for-sale, Securities, Number of Positions | security | 0 | 12
Available-for-sale Securities, Fair Value, Total | $ 0 | $ 103,126
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (567)
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
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (316)
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (316)
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
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (151)
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (151)
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 | 1 | 5
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 7,841 | $ 50,839
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (8) | $ (450)
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
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (226)
Available-for-sale, Securities, Number of Positions | security | 1 | 6
Available-for-sale Securities, Fair Value, Total | $ 7,841 | $ 60,311
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (8) | $ (676)
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
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (6)
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
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (6)
Debt Securities |  |
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 | $ 7,841 | $ 213,997
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (8) | $ (1,302)
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
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ 0 | $ (414)
Available-for-sale, Securities, Number of Positions | security | 1 | 26
Available-for-sale Securities, Fair Value, Total | $ 7,841 | $ 238,011
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (8) | $ (1,716)
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 | $ 71 |
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 |
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 | 0
Available-for-sale Securities, Fair Value, Total | $ 71 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 |

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