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v3.21.2

Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,300,863 | $ 1,432,684
Fair Value | 2,305,075 | 1,453,132
Unrealized Gains | 20,030 | 22,963
Unrealized (Losses) | (15,818) | (2,515)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 367,893 | 167,551
Fair Value | 369,953 | 170,734
Unrealized Gains | 3,632 | 3,348
Unrealized (Losses) | (1,572) | (165)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 70,014 | 70,016
Fair Value | 68,608 | 70,206
Unrealized Gains | 0 | 371
Unrealized (Losses) | (1,406) | (181)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,187,209 | 1,318,998
Fair Value | 2,191,530 | 1,337,706
Unrealized Gains | 18,604 | 20,832
Unrealized (Losses) | (14,283) | (2,124)
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 22,028 | 29,959
Fair Value | 22,886 | 30,900
Unrealized Gains | 858 | 941
Unrealized (Losses) | 0 | 0
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 43,640 | 43,670
Fair Value | 44,937 | 45,220
Unrealized Gains | 1,426 | 1,760
Unrealized (Losses) | (129) | (210)
State and local governments |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost | 345,865 | 137,592
Fair Value | 347,067 | 139,834
Unrealized Gains | 2,774 | 2,407
Unrealized (Losses) | $ (1,572) | $ (165)

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