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Securities - Summary of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,758,556 | $ 2,662,481
Fair Value | 2,314,493 | 2,630,414
Unrealized Gains | 4 | 10,595
Unrealized (Losses) | (444,067) | (42,662)
Securities held to maturity: |  |
Amortized Cost | 541,700 | 513,825
Fair Value | 432,528 | 511,699
Unrealized Gains | 7 | 3,540
Unrealized (Losses) | (109,179) | (5,666)
US Treasury Securities |  |
Fair Value |  |
Amortized Cost | 174,420 |
Fair Value | 168,758 |
Unrealized Gains | 0 |
Unrealized (Losses) | (5,662) |
Securities held to maturity: |  |
Amortized Cost |  | 0
Fair Value |  | 0
Unrealized Gains |  | 0
Unrealized (Losses) |  | 0
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,957 | 71,951
Fair Value | 57,456 | 69,179
Unrealized Gains | 0 | 0
Unrealized (Losses) | (14,501) | (2,772)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,467,839 | 2,545,150
Fair Value | 2,045,000 | 2,514,805
Unrealized Gains | 4 | 9,489
Unrealized (Losses) | (422,843) | (39,834)
Securities held to maturity: |  |
Amortized Cost | 15,150 | 20,260
Fair Value | 14,221 | 20,845
Unrealized Gains | 0 | 585
Unrealized (Losses) | (929) | 0
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 44,340 | 45,380
Fair Value | 43,279 | 46,430
Unrealized Gains | 0 | 1,106
Unrealized (Losses) | (1,061) | (56)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 526,550 | 493,565
Fair Value | 418,307 | 490,854
Unrealized Gains | 7 | 2,955
Unrealized (Losses) | $ (108,250) | $ (5,666)

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