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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities available for sale: |  |
Amortized Cost | $ 202,414 | $ 166,778
Fair Value | 199,329 | 165,614
Unrealized Gain | 342 | 413
Unrealized (Losses) | (3,427) | (1,577)
Securities held to maturity: |  |
Amortized Cost | 129,713 | 154,610
Fair Value | 130,195 | 157,146
Unrealized Gain | 1,815 | 3,284
Unrealized (Losses) | (1,333) | (748)
Government-sponsored enterprise securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 17,497 | 19,000
Fair Value | 17,490 | 18,972
Unrealized Gain |  | 1
Unrealized (Losses) | (7) | (29)
Mortgage-backed securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 151,001 | 122,474
Fair Value | 148,065 | 121,553
Unrealized Gain | 155 | 348
Unrealized (Losses) | (3,091) | (1,269)
Securities held to maturity: |  |
Amortized Cost | 80,585 | 102,509
Fair Value | 79,283 | 101,767
Unrealized Gain |  |
Unrealized (Losses) | (1,302) | (742)
Corporate bonds [Member] |  |
Securities available for sale: |  |
Amortized Cost | 33,833 | 25,216
Fair Value | 33,600 | 24,946
Unrealized Gain | 91 |
Unrealized (Losses) | (324) | (270)
Equity securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 83 | 88
Fair Value | 174 | 143
Unrealized Gain | 96 | 64
Unrealized (Losses) | (5) | (9)
State and local governments [Member] |  |
Securities held to maturity: |  |
Amortized Cost | 49,128 | 52,101
Fair Value | 50,912 | 55,379
Unrealized Gain | 1,815 | 3,284
Unrealized (Losses) | $ (31) | $ (6)

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