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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 197,192 | $ 166,778 |
Fair Value | 199,156 | 165,614 | $ 178,765
Unrealized Gains | 2,360 | 413 |
Unrealized (Losses) | (396) | (1,577) |
Securities held to maturity: |  |  |
Amortized Cost | 135,808 | 154,610 | 160,048
Fair Value | 139,514 | 157,146 | $ 162,858
Unrealized Gains | 3,706 | 3,284 |
Unrealized (Losses) |  | (748) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 3,000 | 19,000 |
Fair Value | 2,999 | 18,972 |
Unrealized Gains |  | 1 |
Unrealized (Losses) | (1) | (29) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 160,267 | 122,474 |
Fair Value | 161,443 | 121,553 |
Unrealized Gains | 1,441 | 348 |
Unrealized (Losses) | (265) | (1,269) |
Securities held to maturity: |  |  |
Amortized Cost | 86,463 | 102,509 |
Fair Value | 87,249 | 101,767 |
Unrealized Gains | 786 |  |
Unrealized (Losses) |  | (742) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,842 | 25,216 |
Fair Value | 34,571 | 24,946 |
Unrealized Gains | 852 |  |
Unrealized (Losses) | (123) | (270) |
Equity securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 83 | 88 |
Fair Value | 143 | 143 |
Unrealized Gains | 67 | 64 |
Unrealized (Losses) | (7) | (9) |
State and local governments [Member] |  |  |
Securities held to maturity: |  |  |
Amortized Cost | 49,345 | 52,101 |
Fair Value | 52,265 | 55,379 |
Unrealized Gains | 2,920 | 3,284 |
Unrealized (Losses) |  | $ (6) |

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