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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 697,897 | $ 513,741
Fair Value | 705,224 | 501,351
Unrealized Gains | 8,901 | 178
Unrealized (Losses) | (1,574) | (12,568)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 74,265 | 101,237
Fair Value | 74,465 | 99,906
Unrealized Gains | 369 | 525
Unrealized (Losses) | (169) | (1,856)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 30,000 | 82,995
Fair Value | 30,053 | 82,662
Unrealized Gains | 55 | 63
Unrealized (Losses) | (2) | (396)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 634,176 | 396,995
Fair Value | 640,488 | 385,551
Unrealized Gains | 7,794 | 39
Unrealized (Losses) | (1,482) | (11,483)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 43,968 | 52,048
Fair Value | 43,801 | 50,241
Unrealized Gains | 0 | 0
Unrealized (Losses) | (167) | (1,807)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 33,721 | 33,751
Fair Value | 34,683 | 33,138
Unrealized Gains | 1,052 | 76
Unrealized (Losses) | (90) | (689)
State and local governments |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 30,297 | 49,189
Fair Value | 30,664 | 49,665
Unrealized Gains | 369 | 525
Unrealized (Losses) | $ (2) | $ (49)

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