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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale: |  |
Amortized Cost | $ 345,482 | $ 202,414
Fair Value | 343,270 | 199,329
Unrealized Gain | 758 | 342
Unrealized (Losses) | (2,969) | (3,427)
Securities held to maturity: |  |
Amortized Cost | 118,503 | 129,713
Fair Value | 118,998 | 130,195
Unrealized Gain | 1,280 | 1,815
Unrealized (Losses) | (785) | (1,333)
Government-sponsored enterprise securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 14,000 | 17,497
Fair Value | 13,867 | 17,490
Unrealized Gain |  |
Unrealized (Losses) | (133) | (7)
Mortgage-backed securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 297,690 | 151,001
Fair Value | 295,213 | 148,065
Unrealized Gain | 246 | 155
Unrealized (Losses) | (2,722) | (3,091)
Securities held to maturity: |  |
Amortized Cost | 63,829 | 80,585
Fair Value | 63,092 | 79,283
Unrealized Gain |  |
Unrealized (Losses) | (737) | (1,302)
State and local governments [Member] |  |
Securities held to maturity: |  |
Amortized Cost | 54,674 | 49,128
Fair Value | 55,906 | 50,912
Unrealized Gain | 1,280 | 1,815
Unrealized (Losses) | (48) | (31)
Corporate bonds [Member] |  |
Securities available for sale: |  |
Amortized Cost | 33,792 | 33,833
Fair Value | 34,190 | 33,600
Unrealized Gain | 512 | 91
Unrealized (Losses) | (114) | (324)
Equity securities [Member] |  |
Securities available for sale: |  |
Amortized Cost |  | 83
Fair Value |  | 174
Unrealized Gain |  | 96
Unrealized (Losses) |  | $ (5)

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