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v3.22.2.2

Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Held-to-maturity |  |  |  |  |  |
Amortized Cost | $ 3,788,460 |  | $ 1,530,500 |  |  |
Allowance for credit losses on HTM | (1,384) | $ (1,381) | (1,279) | $ (1,279) | $ (1,132) | $ (2,915)
Net Carrying Amount | 3,787,076 |  | 1,529,221 |  |  |
Gross Unrealized Gains | 1,129 |  | 6,398 |  |  |
Gross Unrealized (Losses) | (804,165) |  | (18,241) |  |  |
Estimated Fair Value | 2,984,040 |  | 1,517,378 |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 4,484,131 |  | 7,130,861 |  |  |
Allowance for Credit Losses | 0 |  | 0 | 0 |  | (312)
Gross Unrealized Gains | 395 |  | 44,005 |  |  |
Gross Unrealized (Losses) | (546,983) |  | (61,321) |  |  |
Estimated Fair Value | 3,937,543 |  | 7,113,545 |  |  |
U.S. Treasury |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 2,250 |  | 300 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized (Losses) | (59) |  | 0 |  |  |
Estimated Fair Value | 2,191 |  | 300 |  |  |
U.S. Government agencies |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |
Amortized Cost | 447,400 |  | 232,609 |  |  |
Allowance for credit losses on HTM | 0 |  | 0 |  |  |
Net Carrying Amount | 447,400 |  | 232,609 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized (Losses) | (97,871) |  | (7,914) |  |  |
Estimated Fair Value | 349,529 |  | 224,695 |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 195,369 |  | 374,754 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 145 |  | 495 |  |  |
Gross Unrealized (Losses) | (7,454) |  | (10,608) |  |  |
Estimated Fair Value | 188,060 |  | 364,641 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |
Amortized Cost | 1,214,882 |  | 70,342 |  |  |
Allowance for credit losses on HTM | 0 |  | 0 |  |  |
Net Carrying Amount | 1,214,882 |  | 70,342 |  |  |
Gross Unrealized Gains | 1,069 |  | 232 |  |  |
Gross Unrealized (Losses) | (131,437) |  | (1,425) |  |  |
Estimated Fair Value | 1,084,514 |  | 69,149 |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 2,959,882 |  | 4,485,548 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 5 |  | 6,307 |  |  |
Gross Unrealized (Losses) | (289,539) |  | (43,239) |  |  |
Estimated Fair Value | 2,670,348 |  | 4,448,616 |  |  |
State and political subdivisions |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |
Amortized Cost | 1,865,310 |  | 1,210,248 |  |  |
Allowance for credit losses on HTM | (107) | (103) | (1,197) | (1,196) | (871) | (2,307)
Net Carrying Amount | 1,865,203 |  | 1,209,051 |  |  |
Gross Unrealized Gains | 60 |  | 6,166 |  |  |
Gross Unrealized (Losses) | (540,980) |  | (8,462) |  |  |
Estimated Fair Value | 1,324,283 |  | 1,206,755 |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 1,054,356 |  | 1,791,097 |  |  |
Allowance for Credit Losses | 0 |  | 0 | 0 |  | (217)
Gross Unrealized Gains | 244 |  | 30,556 |  |  |
Gross Unrealized (Losses) | (232,091) |  | (1,995) |  |  |
Estimated Fair Value | 822,509 |  | 1,819,658 |  |  |
Other securities |  |  |  |  |  |
Held-to-maturity |  |  |  |  |  |
Amortized Cost | 260,868 |  | 17,301 |  |  |
Allowance for credit losses on HTM | (1,277) | $ (1,278) | (82) | (83) | $ (261) | (608)
Net Carrying Amount | 259,591 |  | 17,219 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized (Losses) | (33,877) |  | (440) |  |  |
Estimated Fair Value | 225,714 |  | 16,779 |  |  |
Available-for-sale |  |  |  |  |  |
Amortized Cost | 272,274 |  | 479,162 |  |  |
Allowance for Credit Losses | 0 |  | 0 | $ 0 |  | $ (95)
Gross Unrealized Gains | 1 |  | 6,647 |  |  |
Gross Unrealized (Losses) | (17,840) |  | (5,479) |  |  |
Estimated Fair Value | $ 254,435 |  | $ 480,330 |  |  |

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