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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 198,486 | $ 202,414 |
Fair Value | 198,924 | 199,329 | $ 199,156
Unrealized Gains | 1,374 | 342 |
Unrealized (Losses) | (936) | (3,427) |
Securities held to maturity: |  |  |
Amortized Cost | 123,156 | 129,713 | 135,808
Fair Value | 124,878 | 130,195 | $ 139,514
Unrealized Gains | 1,923 | 1,815 |
Unrealized (Losses) | (201) | (1,333) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 9,000 | 17,497 |
Fair Value | 8,992 | 17,490 |
Unrealized Gains | 1 |  |
Unrealized (Losses) | (9) | (7) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 155,684 | 151,001 |
Fair Value | 155,535 | 148,065 |
Unrealized Gains | 713 | 155 |
Unrealized (Losses) | (862) | (3,091) |
Securities held to maturity: |  |  |
Amortized Cost | 67,708 | 80,585 |
Fair Value | 67,529 | 79,283 |
Unrealized Gains | 15 |  |
Unrealized (Losses) | (194) | (1,302) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,802 | 33,833 |
Fair Value | 34,397 | 33,600 |
Unrealized Gains | 660 | 91 |
Unrealized (Losses) | (65) | (324) |
Equity securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost |  | 83 |
Fair Value |  | 174 |
Unrealized Gains |  | 96 |
Unrealized (Losses) |  | (5) |
State and local governments [Member] |  |  |
Securities held to maturity: |  |  |
Amortized Cost | 55,448 | 49,128 |
Fair Value | 57,349 | 50,912 |
Unrealized Gains | 1,908 | 1,815 |
Unrealized (Losses) | $ (7) | $ (31) |

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