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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) $ in Thousands | Mar. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) 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 | 32 | 31
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 269,522 | $ 267,500
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (3,250) | $ (3,472)
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 | 32 | 31
Available-for-sale Securities, Fair Value, Total | $ 269,522 | $ 267,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (3,250) | $ (3,472)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 1 | 1
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 9,849 | $ 9,811
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (91) | $ (127)
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 | 1 | 1
Available-for-sale Securities, Fair Value, Total | $ 9,849 | $ 9,811
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (91) | $ (127)
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 | 7 | 7
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 62,308 | $ 62,483
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (421) | $ (383)
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 | 7 | 7
Available-for-sale Securities, Fair Value, Total | $ 62,308 | $ 62,483
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (421) | $ (383)
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 | 9 | 10
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 74,604 | $ 83,031
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (773) | $ (734)
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 | 9 | 10
Available-for-sale Securities, Fair Value, Total | $ 74,604 | $ 83,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (773) | $ (734)
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 | 2 | 2
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 9,692 | $ 10,022
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (236) | $ (232)
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 | 2 | 2
Available-for-sale Securities, Fair Value, Total | $ 9,692 | $ 10,022
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (236) | $ (232)
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 | 12 | 10
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 113,000 | $ 96,576
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (1,727) | $ (1,950)
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 | 12 | 10
Available-for-sale Securities, Fair Value, Total | $ 113,000 | $ 96,576
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,727) | $ (1,950)
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 | $ 5,577
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (46)
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 | $ 5,577
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0 | $ (46)
Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 31 | 31
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 269,453 | $ 267,500
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (3,248) | $ (3,472)
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 | 31 | 31
Available-for-sale Securities, Fair Value, Total | $ 269,453 | $ 267,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (3,248) | $ (3,472)
Marketable Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security | 1 | 0
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 69 | $ 0
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (2) | $ 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 | 1 | 0
Available-for-sale Securities, Fair Value, Total | $ 69 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (2) | $ 0

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