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v3.23.1

Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Amortized Cost | $ 2,698,996 | $ 2,758,556
Fair Value | 2,290,265 | 2,314,493
Unrealized gains | 3 | 4
Unrealized (losses) | (408,734) | (444,067)
Securities held to maturity: |  |
Amortized Cost | 539,795 | 541,700
Fair Value | 448,904 | 432,528
Unrealized gains | 53 | 7
Unrealized (losses) | (90,944) | (109,179)
U.S. Treasuries |  |
Fair Value |  |
Amortized Cost | 174,510 | 174,420
Fair Value | 170,109 | 168,758
Unrealized gains | 0 | 0
Unrealized (losses) | (4,401) | (5,662)
Government-sponsored enterprise securities |  |
Fair Value |  |
Amortized Cost | 71,959 | 71,957
Fair Value | 59,304 | 57,456
Unrealized gains | 0 | 0
Unrealized (losses) | (12,655) | (14,501)
Mortgage-backed securities |  |
Fair Value |  |
Amortized Cost | 2,432,854 | 2,467,839
Fair Value | 2,042,379 | 2,045,000
Unrealized gains | 3 | 4
Unrealized (losses) | (390,478) | (422,843)
Securities held to maturity: |  |
Amortized Cost | 14,360 | 15,150
Fair Value | 13,539 | 14,221
Unrealized gains | 0 | 0
Unrealized (losses) | (821) | (929)
Corporate bonds |  |
Fair Value |  |
Amortized Cost | 19,673 | 44,340
Fair Value | 18,473 | 43,279
Unrealized gains | 0 | 0
Unrealized (losses) | (1,200) | (1,061)
State and local governments |  |
Securities held to maturity: |  |
Amortized Cost | 525,435 | 526,550
Fair Value | 435,365 | 418,307
Unrealized gains | 53 | 7
Unrealized (losses) | $ (90,123) | $ (108,250)

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