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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 216,480 | $ 202,414 |
Fair Value | 214,743 | 199,329 | $ 247,140
Unrealized Gains | 514 | 342 |
Unrealized (Losses) | (2,251) | (3,427) |
Securities held to maturity: |  |  |
Amortized Cost | 133,254 | 129,713 | 148,485
Fair Value | 134,185 | 130,195 | $ 151,684
Unrealized Gains | 1,897 | 1,815 |
Unrealized (Losses) | (966) | (1,333) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 19,498 | 17,497 |
Fair Value | 19,426 | 17,490 |
Unrealized Gains | 8 |  |
Unrealized (Losses) | (80) | (7) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 162,660 | 151,001 |
Fair Value | 160,786 | 148,065 |
Unrealized Gains | 220 | 155 |
Unrealized (Losses) | (2,094) | (3,091) |
Securities held to maturity: |  |  |
Amortized Cost | 76,201 | 80,585 |
Fair Value | 75,264 | 79,283 |
Unrealized Gains |  |  |
Unrealized (Losses) | (937) | (1,302) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 34,322 | 33,833 |
Fair Value | 34,531 | 33,600 |
Unrealized Gains | 286 | 91 |
Unrealized (Losses) | (77) | (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 | 57,053 | 49,128 |
Fair Value | 58,921 | 50,912 |
Unrealized Gains | 1,897 | 1,815 |
Unrealized (Losses) | $ (29) | $ (31) |

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