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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) $ in Thousands | Sep. 30, 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 | 30 | 31
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 258,806 | $ 267,500
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (2,211) | $ (3,472)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 1 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 7,586 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (232) | $ 0
Available-for-sale, Securities, Number of Positions | security | 31 | 31
Available-for-sale Securities, Fair Value, Total | $ 266,392 | $ 267,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (2,443) | $ (3,472)
U.S. treasury securities |  |
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 | $ 14,903 | $ 9,811
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (38) | $ (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 | 2 | 1
Available-for-sale Securities, Fair Value, Total | $ 14,903 | $ 9,811
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (38) | $ (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 | 8 | 7
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 72,102 | $ 62,483
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (357) | $ (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 | 8 | 7
Available-for-sale Securities, Fair Value, Total | $ 72,102 | $ 62,483
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (357) | $ (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 | 8 | 10
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 62,408 | $ 83,031
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (608) | $ (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 | 8 | 10
Available-for-sale Securities, Fair Value, Total | $ 62,408 | $ 83,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (608) | $ (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 | $ 9,071 | $ 10,022
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (151) | $ (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 | $ 9,071 | $ 10,022
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (151) | $ (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 | 10 | 10
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 100,322 | $ 96,576
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (1,057) | $ (1,950)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 1 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 7,586 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (232) | $ 0
Available-for-sale, Securities, Number of Positions | security | 11 | 10
Available-for-sale Securities, Fair Value, Total | $ 107,908 | $ 96,576
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,289) | $ (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 | 30 | 31
Available-for-sale Securities, Less Than 12 Months, Fair Value | $ 258,806 | $ 267,500
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses | $ (2,211) | $ (3,472)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security | 1 | 0
Available-for-sale Securities, 12 Months or More, Fair Value | $ 7,586 | $ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses | $ (232) | $ 0
Available-for-sale, Securities, Number of Positions | security | 31 | 31
Available-for-sale Securities, Fair Value, Total | $ 266,392 | $ 267,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (2,443) | $ (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 | 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

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