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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale: |  |
Amortized Cost | $ 513,741 | $ 345,482
Fair Value | 501,351 | 343,270
Unrealized Gain | 178 | 758
Unrealized (Losses) | (12,568) | (2,969)
Securities held to maturity: |  |
Amortized Cost | 101,237 | 118,503
Fair Value | 99,906 | 118,998
Unrealized Gain | 525 | 1,280
Unrealized (Losses) | (1,856) | (785)
Government-sponsored enterprise securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 82,995 | 14,000
Fair Value | 82,662 | 13,867
Unrealized Gain | 63 |
Unrealized (Losses) | (396) | (133)
Mortgage-backed securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 396,995 | 297,690
Fair Value | 385,551 | 295,213
Unrealized Gain | 39 | 246
Unrealized (Losses) | (11,483) | (2,722)
Securities held to maturity: |  |
Amortized Cost | 52,048 | 63,829
Fair Value | 50,241 | 63,092
Unrealized Gain |  |
Unrealized (Losses) | (1,807) | (737)
State and local governments [Member] |  |
Securities held to maturity: |  |
Amortized Cost | 49,189 | 54,674
Fair Value | 49,665 | 55,906
Unrealized Gain | 525 | 1,280
Unrealized (Losses) | (49) | (48)
Corporate bonds [Member] |  |
Securities available for sale: |  |
Amortized Cost | 33,751 | 33,792
Fair Value | 33,138 | 34,190
Unrealized Gain | 76 | 512
Unrealized (Losses) | $ (689) | $ (114)

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