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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 759,576 | $ 812,202
Fair Value | 784,832 | 821,945
Unrealized Gains | 25,985 | 10,505
Unrealized (Losses) | (729) | (762)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 94,924 | 67,932
Fair Value | 96,318 | 68,333
Unrealized Gains | 1,394 | 410
Unrealized (Losses) | 0 | (9)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 45,024 | 20,000
Fair Value | 45,394 | 20,009
Unrealized Gains | 370 | 17
Unrealized (Losses) | 0 | (8)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 670,861 | 758,491
Fair Value | 694,299 | 767,285
Unrealized Gains | 23,913 | 9,463
Unrealized (Losses) | (475) | (669)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 36,387 | 41,423
Fair Value | 37,363 | 41,542
Unrealized Gains | 976 | 125
Unrealized (Losses) | 0 | (6)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 43,691 | 33,711
Fair Value | 45,139 | 34,651
Unrealized Gains | 1,702 | 1,025
Unrealized (Losses) | (254) | (85)
State and local governments |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 58,537 | 26,509
Fair Value | 58,955 | 26,791
Unrealized Gains | 418 | 285
Unrealized (Losses) | $ 0 | $ (3)

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