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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Securities available for sale: |  |  |
Amortized Cost | $ 365,507 | $ 345,482 |
Fair Value | 353,068 | 343,270 | $ 198,924
Unrealized Gains | 43 | 758 |
Unrealized (Losses) | (12,483) | (2,969) |
Securities held to maturity: |  |  |
Amortized Cost | 104,819 | 118,503 | 123,156
Fair Value | 103,360 | 118,998 | $ 124,878
Unrealized Gains | 584 | 1,280 |
Unrealized (Losses) | (2,043) | (785) |
Government-sponsored enterprise securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 44,000 | 14,000 |
Fair Value | 43,422 | 13,867 |
Unrealized Gains |  |  |
Unrealized (Losses) | (578) | (133) |
Mortgage-backed securities [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 287,746 | 297,690 |
Fair Value | 276,474 | 295,213 |
Unrealized Gains | 42 | 246 |
Unrealized (Losses) | (11,314) | (2,722) |
Securities held to maturity: |  |  |
Amortized Cost | 54,512 | 63,829 |
Fair Value | 52,560 | 63,092 |
Unrealized Gains |  |  |
Unrealized (Losses) | (1,952) | (737) |
Corporate bonds [Member] |  |  |
Securities available for sale: |  |  |
Amortized Cost | 33,761 | 33,792 |
Fair Value | 33,172 | 34,190 |
Unrealized Gains | 1 | 512 |
Unrealized (Losses) | (591) | (114) |
State and local governments [Member] |  |  |
Securities held to maturity: |  |  |
Amortized Cost | 50,307 | 54,674 |
Fair Value | 50,800 | 55,906 |
Unrealized Gains | 584 | 1,280 |
Unrealized (Losses) | $ (91) | $ (48) |

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