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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-Sale |  |
Amortized Cost | $ 8,250,226,000 | $ 7,384,033,000
Unrealized Gains | 5,112,000 | 112,282,000
Unrealized Losses | (579,833,000) | (118,235,000)
Basis adjustments | (107,804,000) | 3,986,000
Fair Value | 7,567,701,000 | 7,382,066,000
Held-to-Maturity |  |
Amortized Cost | 3,084,186,000 | 0
Unrealized Gains | 239,000 |
Unrealized Losses | (305,135,000) |
Basis adjustments | 0 |
Allowance for securities held-to-maturity | (151,000) |
Fair Value | 2,779,290,000 | 0
Total held-to-maturity securities | 3,084,186,000 | 0
U.S. Treasury |  |
Available-for-Sale |  |
Amortized Cost | 441,846,000 | 234,555,000
Unrealized Gains | 9,000 | 1,233,000
Unrealized Losses | (7,739,000) | (7,751,000)
Basis adjustments | (31,333,000) | 7,547,000
Fair Value | 402,783,000 | 235,584,000
U.S. government-sponsored entities and agencies |  |
Available-for-Sale |  |
Amortized Cost | 1,442,261,000 | 1,575,994,000
Unrealized Gains | 1,000 | 7,354,000
Unrealized Losses | (123,234,000) | (37,014,000)
Basis adjustments | (76,471,000) | (3,561,000)
Fair Value | 1,242,557,000 | 1,542,773,000
Held-to-Maturity |  |
Amortized Cost | 815,833,000 |
Unrealized Gains | 0 |
Unrealized Losses | (95,398,000) |
Basis adjustments | 0 |
Fair Value | 720,435,000 |
Mortgage-backed securities |  |
Available-for-Sale |  |
Amortized Cost | 5,227,908,000 | 3,737,484,000
Unrealized Gains | 794,000 | 27,421,000
Unrealized Losses | (400,994,000) | (66,074,000)
Basis adjustments | 0 | 0
Fair Value | 4,827,708,000 | 3,698,831,000
Held-to-Maturity |  |
Amortized Cost | 1,149,212,000 |
Unrealized Gains | 170,000 |
Unrealized Losses | (59,940,000) |
Basis adjustments | 0 |
Fair Value | 1,089,442,000 |
States and political subdivisions |  |
Available-for-Sale |  |
Amortized Cost | 740,026,000 | 1,587,172,000
Unrealized Gains | 4,132,000 | 69,696,000
Unrealized Losses | (24,117,000) | (1,882,000)
Basis adjustments | 0 | 0
Fair Value | 720,041,000 | 1,654,986,000
Held-to-Maturity |  |
Amortized Cost | 1,119,292,000 |
Unrealized Gains | 69,000 |
Unrealized Losses | (149,797,000) |
Basis adjustments | 0 |
Fair Value | 969,564,000 |
Pooled trust preferred securities |  |
Available-for-Sale |  |
Amortized Cost | 13,768,000 | 13,756,000
Unrealized Gains | 0 | 0
Unrealized Losses | (2,667,000) | (4,260,000)
Basis adjustments | 0 | 0
Fair Value | 11,101,000 | 9,496,000
Other securities |  |
Available-for-Sale |  |
Amortized Cost | 384,417,000 | 235,072,000
Unrealized Gains | 176,000 | 6,578,000
Unrealized Losses | (21,082,000) | (1,254,000)
Basis adjustments | 0 | 0
Fair Value | $ 363,511,000 | $ 240,396,000

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