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v3.23.3

Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,622,066 | $ 2,758,556
Fair Value | 2,100,406 | 2,314,493
Unrealized gains | 0 | 4
Unrealized (losses) | (521,660) | (444,067)
Securities held to maturity: |  |
Amortized Cost | 535,460 | 541,700
Fair Value | 410,321 | 432,528
Unrealized gains | 0 | 7
Unrealized (losses) | (125,139) | (109,179)
U.S. Treasuries |  |
Fair Value |  |
Amortized Cost | 174,693 | 174,420
Fair Value | 170,859 | 168,758
Unrealized gains | 0 | 0
Unrealized (losses) | (3,834) | (5,662)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,962 | 71,957
Fair Value | 56,904 | 57,456
Unrealized gains | 0 | 0
Unrealized (losses) | (15,058) | (14,501)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,355,736 | 2,467,839
Fair Value | 1,854,448 | 2,045,000
Unrealized gains | 0 | 4
Unrealized (losses) | (501,288) | (422,843)
Securities held to maturity: |  |
Amortized Cost | 12,755 | 15,150
Fair Value | 11,674 | 14,221
Unrealized gains | 0 | 0
Unrealized (losses) | (1,081) | (929)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 19,675 | 44,340
Fair Value | 18,195 | 43,279
Unrealized gains | 0 | 0
Unrealized (losses) | (1,480) | (1,061)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 522,705 | 526,550
Fair Value | 398,647 | 418,307
Unrealized gains | 0 | 7
Unrealized (losses) | $ (124,058) | $ (108,250)

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