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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Fair Value |  |  |
Amortized Cost | $ 686,757 | $ 513,741 |
Fair Value | 691,971 | 501,351 | $ 334,068
Unrealized Gains | 8,270 | 178 |
Unrealized (Losses) | (3,056) | (12,568) |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |  |
Amortized Cost | 79,050 | 101,237 | 108,265
Fair Value | 79,044 | 99,906 | $ 107,068
Unrealized Gains | 444 | 525 |
Unrealized (Losses) | (450) | (1,856) |
Government-sponsored enterprise securities |  |  |
Fair Value |  |  |
Amortized Cost | 59,202 | 82,995 |
Fair Value | 59,477 | 82,662 |
Unrealized Gains | 313 | 63 |
Unrealized (Losses) | (38) | (396) |
Mortgage-backed securities |  |  |
Fair Value |  |  |
Amortized Cost | 593,824 | 396,995 |
Fair Value | 598,024 | 385,551 |
Unrealized Gains | 7,088 | 39 |
Unrealized (Losses) | (2,888) | (11,483) |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |  |
Amortized Cost | 46,447 | 52,048 |
Fair Value | 45,998 | 50,241 |
Unrealized Gains | 0 | 0 |
Unrealized (Losses) | (449) | (1,807) |
Corporate bonds |  |  |
Fair Value |  |  |
Amortized Cost | 33,731 | 33,751 |
Fair Value | 34,470 | 33,138 |
Unrealized Gains | 869 | 76 |
Unrealized (Losses) | (130) | (689) |
State and local governments |  |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |  |
Amortized Cost | 32,603 | 49,189 |
Fair Value | 33,046 | 49,665 |
Unrealized Gains | 444 | 525 |
Unrealized (Losses) | $ (1) | $ (49) |

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