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v3.23.2

Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale |  |
Total | $ 7,551,258 | $ 7,772,603
Unrealized Gains | 1,084 | 3,028
Unrealized Losses | (935,766) | (847,474)
Basis adjustments | (116,061) | (154,445)
Fair Value | 6,500,515 | 6,773,712
Held-to-Maturity |  |
Allowance for securities held-to-maturity | (150) | (150)
Total held-to-maturity securities | 3,054,997 | 3,089,147
Unrealized Gains | 437 | 221
Unrealized Losses | (452,376) | (445,686)
Basis adjustments | 0 | 0
Fair Value | 2,603,058 | 2,643,682
U.S. Treasury |  |
Available-for-Sale |  |
Total | 364,824 | 253,148
Unrealized Gains | 0 | 5
Unrealized Losses | (9,245) | (5,189)
Basis adjustments | (43,167) | (47,037)
Fair Value | 312,412 | 200,927
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Total | 1,448,873 | 1,451,736
Unrealized Gains | 0 | 0
Unrealized Losses | (201,623) | (169,248)
Basis adjustments | (72,894) | (107,408)
Fair Value | 1,174,356 | 1,175,080
Held-to-Maturity |  |
Amortized Cost | 822,517 | 819,168
Unrealized Gains | 0 | 0
Unrealized Losses | (167,071) | (162,810)
Basis adjustments | 0 | 0
Fair Value | 655,446 | 656,358
Mortgage-backed securities |  |
Available-for-Sale |  |
Total | 4,760,921 | 4,986,354
Unrealized Gains | 123 | 976
Unrealized Losses | (663,273) | (617,428)
Basis adjustments | 0 | 0
Fair Value | 4,097,771 | 4,369,902
Held-to-Maturity |  |
Amortized Cost | 1,070,687 | 1,106,817
Unrealized Gains | 0 | 0
Unrealized Losses | (142,191) | (123,854)
Basis adjustments | 0 | 0
Fair Value | 928,496 | 982,963
States and political subdivisions |  |
Available-for-Sale |  |
Total | 623,196 | 688,159
Unrealized Gains | 844 | 1,789
Unrealized Losses | (25,258) | (26,096)
Basis adjustments | 0 | 0
Fair Value | 598,782 | 663,852
Held-to-Maturity |  |
Amortized Cost | 1,161,943 | 1,163,312
Unrealized Gains | 437 | 221
Unrealized Losses | (143,114) | (159,022)
Basis adjustments | 0 | 0
Fair Value | 1,019,266 | 1,004,511
Pooled trust preferred securities |  |
Available-for-Sale |  |
Total | 13,791 | 13,783
Unrealized Gains | 0 | 0
Unrealized Losses | (2,797) | (2,972)
Basis adjustments | 0 | 0
Fair Value | 10,994 | 10,811
Other securities |  |
Available-for-Sale |  |
Total | 339,653 | 379,423
Unrealized Gains | 117 | 258
Unrealized Losses | (33,570) | (26,541)
Basis adjustments | 0 | 0
Fair Value | $ 306,200 | $ 353,140

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