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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,507,371 | $ 2,590,099
Fair Value | 2,088,483 | 2,189,379
Unrealized gains | 22 | 30
Unrealized (losses) | (418,910) | (400,750)
Securities held to maturity: |  |
Amortized Cost | 525,627 | 533,678
Fair Value | 436,655 | 449,623
Unrealized gains | 5 | 39
Unrealized (losses) | (88,977) | (84,094)
U.S. Treasuries |  |
Fair Value |  |
Amortized Cost | 124,876 | 174,785
Fair Value | 123,770 | 172,570
Unrealized gains | 0 | 0
Unrealized (losses) | (1,106) | (2,215)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,965 | 71,964
Fair Value | 59,959 | 60,266
Unrealized gains | 0 | 0
Unrealized (losses) | (12,006) | (11,698)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,291,854 | 2,323,674
Fair Value | 1,886,949 | 1,937,784
Unrealized gains | 22 | 30
Unrealized (losses) | (404,927) | (385,920)
Securities held to maturity: |  |
Amortized Cost | 11,369 | 12,085
Fair Value | 10,682 | 11,447
Unrealized gains | 0 | 0
Unrealized (losses) | (687) | (638)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 18,676 | 19,676
Fair Value | 17,805 | 18,759
Unrealized gains | 0 | 0
Unrealized (losses) | (871) | (917)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 514,258 | 521,593
Fair Value | 425,973 | 438,176
Unrealized gains | 5 | 39
Unrealized (losses) | $ (88,290) | $ (83,456)

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