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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-Sale |  |
Amortized Cost | $ 9,218,249 | $ 7,384,033
Unrealized Gains | 54,315 | 112,282
Unrealized Losses | (467,917) | (118,235)
Basis Adjustments | (54,043) | 3,986
Fair Value | 8,750,604 | 7,382,066
Held-to-Maturity |  |
Amortized Cost | 2,082,242 | 0
Unrealized Gains | 42 |
Unrealized Losses | (126,688) |
Basis Adjustments | 0 |
Allowance for securities held-to-maturity | (160) |
Fair Value | 1,955,596 | 0
Total held-to-maturity securities | 2,082,242 |
U.S. Treasury |  |
Available-for-Sale |  |
Amortized Cost | 440,461 | 234,555
Unrealized Gains | 0 | 1,233
Unrealized Losses | (8,887) | (7,751)
Basis Adjustments | (12,550) | 7,547
Fair Value | 419,024 | 235,584
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Amortized Cost | 1,730,259 | 1,575,994
Unrealized Gains | 41,507 | 7,354
Unrealized Losses | (150,253) | (37,014)
Basis Adjustments | (41,493) | (3,561)
Fair Value | 1,580,020 | 1,542,773
Held-to-Maturity |  |
Amortized Cost | 528,524 |
Unrealized Gains | 0 |
Unrealized Losses | (48,115) |
Basis Adjustments | 0 |
Fair Value | 480,409 |
Mortgage-backed securities |  |
Available-for-Sale |  |
Amortized Cost | 5,904,666 | 3,737,484
Unrealized Gains | 2,535 | 27,421
Unrealized Losses | (283,459) | (66,074)
Basis Adjustments | 0 | 0
Fair Value | 5,623,742 | 3,698,831
Held-to-Maturity |  |
Amortized Cost | 463,111 |
Unrealized Gains | 0 |
Unrealized Losses | (22,057) |
Basis Adjustments | 0 |
Fair Value | 441,054 |
States and political subdivisions |  |
Available-for-Sale |  |
Amortized Cost | 750,442 | 1,587,172
Unrealized Gains | 9,499 | 69,696
Unrealized Losses | (9,885) | (1,882)
Basis Adjustments | 0 | 0
Fair Value | 750,056 | 1,654,986
Held-to-Maturity |  |
Amortized Cost | 1,090,667 |
Unrealized Gains | 42 |
Unrealized Losses | (56,516) |
Basis Adjustments | 0 |
Fair Value | 1,034,193 |
Pooled trust preferred securities |  |
Available-for-Sale |  |
Amortized Cost | 13,762 | 13,756
Unrealized Gains | 0 | 0
Unrealized Losses | (4,097) | (4,260)
Basis Adjustments | 0 | 0
Fair Value | 9,665 | 9,496
Other securities |  |
Available-for-Sale |  |
Amortized Cost | 378,659 | 235,072
Unrealized Gains | 774 | 6,578
Unrealized Losses | (11,336) | (1,254)
Basis Adjustments | 0 | 0
Fair Value | 368,097 | $ 240,396
Held-to-Maturity |  |
Amortized Cost | 100 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Basis Adjustments | 0 |
Fair Value | $ 100 |

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