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Securities - Summary of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,590,099 | $ 2,758,556
Fair Value | 2,189,379 | 2,314,493
Unrealized Gains | 30 | 4
Unrealized (Losses) | (400,750) | (444,067)
Securities held to maturity: |  |
Amortized Cost | 533,678 | 541,700
Fair Value | 449,623 | 432,528
Unrealized Gains | 39 | 7
Unrealized (Losses) | (84,094) | (109,179)
US Treasury Securities |  |
Fair Value |  |
Amortized Cost | 174,785 |
Fair Value | 172,570 |
Unrealized Gains | 0 |
Unrealized (Losses) | (2,215) |
Securities held to maturity: |  |
Amortized Cost |  | 174,420
Fair Value |  | 168,758
Unrealized Gains |  | 0
Unrealized (Losses) |  | (5,662)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,964 | 71,957
Fair Value | 60,266 | 57,456
Unrealized Gains | 0 | 0
Unrealized (Losses) | (11,698) | (14,501)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,323,674 | 2,467,839
Fair Value | 1,937,784 | 2,045,000
Unrealized Gains | 30 | 4
Unrealized (Losses) | (385,920) | (422,843)
Securities held to maturity: |  |
Amortized Cost | 12,085 | 15,150
Fair Value | 11,447 | 14,221
Unrealized Gains | 0 | 0
Unrealized (Losses) | (638) | (929)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 19,676 | 44,340
Fair Value | 18,759 | 43,279
Unrealized Gains | 0 | 0
Unrealized (Losses) | (917) | (1,061)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 521,593 | 526,550
Fair Value | 438,176 | 418,307
Unrealized Gains | 39 | 7
Unrealized (Losses) | $ (83,456) | $ (108,250)

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