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Securities - Summary of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available for sale: |  |
Amortized Cost | $ 1,432,684 | $ 812,202
Fair Value | 1,453,132 | 821,945
Unrealized Gains | 22,963 | 10,505
Unrealized (Losses) | (2,515) | (762)
Securities held to maturity: |  |
Amortized Cost | 167,551 | 67,932
Fair Value | 170,734 | 68,333
Unrealized Gains | 3,348 | 410
Unrealized (Losses) | (165) | (9)
Government-sponsored enterprise securities |  |
Securities available for sale: |  |
Amortized Cost | 70,016 | 20,000
Fair Value | 70,206 | 20,009
Unrealized Gains | 371 | 17
Unrealized (Losses) | (181) | (8)
Mortgage-backed securities |  |
Securities available for sale: |  |
Amortized Cost | 1,318,998 | 758,491
Fair Value | 1,337,706 | 767,285
Unrealized Gains | 20,832 | 9,463
Unrealized (Losses) | (2,124) | (669)
Securities held to maturity: |  |
Amortized Cost | 29,959 | 41,423
Fair Value | 30,900 | 41,542
Unrealized Gains | 941 | 125
Unrealized (Losses) | 0 | (6)
Corporate bonds |  |
Securities available for sale: |  |
Amortized Cost | 43,670 | 33,711
Fair Value | 45,220 | 34,651
Unrealized Gains | 1,760 | 1,025
Unrealized (Losses) | (210) | (85)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 137,592 | 26,509
Fair Value | 139,834 | 26,791
Unrealized Gains | 2,407 | 285
Unrealized (Losses) | $ (165) | $ (3)

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