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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 218,039 | $ 166,778 |
Fair Value | 219,762 | 165,614 | $ 214,450
Unrealized Gains | 2,095 | 413 |
Unrealized (Losses) | (372) | (1,577) |
Securities held to maturity: |  |  |
Amortized Cost | 142,073 | 154,610 | 165,245
Fair Value | 146,099 | 157,146 | $ 167,759
Unrealized Gains | 4,026 | 3,284 |
Unrealized (Losses) |  | (748) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 16,000 | 19,000 |
Fair Value | 15,992 | 18,972 |
Unrealized Gains | 2 | 1 |
Unrealized (Losses) | (10) | (29) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 168,103 | 122,474 |
Fair Value | 169,256 | 121,553 |
Unrealized Gains | 1,437 | 348 |
Unrealized (Losses) | (284) | (1,269) |
Securities held to maturity: |  |  |
Amortized Cost | 92,675 | 102,509 |
Fair Value | 93,444 | 101,767 |
Unrealized Gains | 769 |  |
Unrealized (Losses) |  | (742) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,853 | 25,216 |
Fair Value | 34,381 | 24,946 |
Unrealized Gains | 598 |  |
Unrealized (Losses) | (70) | (270) |
Equity securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 83 | 88 |
Fair Value | 133 | 143 |
Unrealized Gains | 58 | 64 |
Unrealized (Losses) | (8) | (9) |
State and local governments [Member] |  |  |
Securities held to maturity: |  |  |
Amortized Cost | 49,398 | 52,101 |
Fair Value | 52,655 | 55,379 |
Unrealized Gains | 3,257 | 3,284 |
Unrealized (Losses) |  | $ (6) |

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