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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 1,143,431 | $ 812,202
Fair Value | 1,168,706 | 821,945
Unrealized Gains | 26,574 | 10,505
Unrealized (Losses) | (1,299) | (762)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 110,200 | 67,932
Fair Value | 112,114 | 68,333
Unrealized Gains | 1,914 | 410
Unrealized (Losses) | 0 | (9)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 75,016 | 20,000
Fair Value | 75,653 | 20,009
Unrealized Gains | 637 | 17
Unrealized (Losses) | 0 | (8)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 1,024,735 | 758,491
Fair Value | 1,047,922 | 767,285
Unrealized Gains | 24,194 | 9,463
Unrealized (Losses) | (1,007) | (669)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 33,222 | 41,423
Fair Value | 34,161 | 41,542
Unrealized Gains | 939 | 125
Unrealized (Losses) | 0 | (6)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 43,680 | 33,711
Fair Value | 45,131 | 34,651
Unrealized Gains | 1,743 | 1,025
Unrealized (Losses) | (292) | (85)
State and local governments |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 76,978 | 26,509
Fair Value | 77,953 | 26,791
Unrealized Gains | 975 | 285
Unrealized (Losses) | $ 0 | $ (3)

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