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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 207,244 | $ 202,414 |
Fair Value | 207,496 | 199,329 | $ 219,762
Unrealized Gains | 1,304 | 342 |
Unrealized (Losses) | (1,052) | (3,427) |
Securities held to maturity: |  |  |
Amortized Cost | 127,866 | 129,713 | 142,073
Fair Value | 129,697 | 130,195 | $ 146,099
Unrealized Gains | 2,100 | 1,815 |
Unrealized (Losses) | (269) | (1,333) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 16,498 | 17,497 |
Fair Value | 16,498 | 17,490 |
Unrealized Gains | 7 |  |
Unrealized (Losses) | (7) | (7) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 156,934 | 151,001 |
Fair Value | 156,601 | 148,065 |
Unrealized Gains | 647 | 155 |
Unrealized (Losses) | (980) | (3,091) |
Securities held to maturity: |  |  |
Amortized Cost | 72,257 | 80,585 |
Fair Value | 72,005 | 79,283 |
Unrealized Gains | 10 |  |
Unrealized (Losses) | (262) | (1,302) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,812 | 33,833 |
Fair Value | 34,397 | 33,600 |
Unrealized Gains | 650 | 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 | 55,609 | 49,128 |
Fair Value | 57,692 | 50,912 |
Unrealized Gains | 2,090 | 1,815 |
Unrealized (Losses) | $ (7) | $ (31) |

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