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v3.22.1

Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Held-to-maturity |  |  |  |
Amortized Cost | $ 1,558,202 | $ 1,530,500 |  |
Allowance for credit losses on HTM | (1,377) | (1,279) | $ (1,618) | $ (2,915)
Net Carrying Amount | 1,556,825 | 1,529,221 |  |
Gross Unrealized Gains | 385 | 6,398 |  |
Gross Unrealized (Losses) | (250,152) | (18,241) |  |
Estimated Fair Value | 1,307,058 | 1,517,378 |  |
Available-for-sale |  |  |  |
Amortized Cost | 7,070,582 | 7,130,861 |  |
Allowance for credit losses on AFS | 0 | 0 | (2,454) | (312)
Gross Unrealized Gains | 5,413 | 44,005 |  |
Gross Unrealized (Losses) | (435,926) | (61,321) |  |
Estimated Fair Value | 6,640,069 | 7,113,545 |  |
U.S. Treasury |  |  |  |
Available-for-sale |  |  |  |
Amortized Cost | 0 | 300 |  |
Allowance for credit losses on AFS | 0 | 0 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | 0 | 0 |  |
Estimated Fair Value | 0 | 300 |  |
U.S. Government agencies |  |  |  |
Held-to-maturity |  |  |  |
Amortized Cost | 232,670 | 232,609 |  |
Allowance for credit losses on HTM | 0 | 0 |  |
Net Carrying Amount | 232,670 | 232,609 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | (31,510) | (7,914) |  |
Estimated Fair Value | 201,160 | 224,695 |  |
Available-for-sale |  |  |  |
Amortized Cost | 367,730 | 374,754 |  |
Allowance for credit losses on AFS | 0 | 0 |  |
Gross Unrealized Gains | 239 | 495 |  |
Gross Unrealized (Losses) | (34,738) | (10,608) |  |
Estimated Fair Value | 333,231 | 364,641 |  |
Mortgage-backed securities |  |  |  |
Held-to-maturity |  |  |  |
Amortized Cost | 112,496 | 70,342 |  |
Allowance for credit losses on HTM | 0 | 0 |  |
Net Carrying Amount | 112,496 | 70,342 |  |
Gross Unrealized Gains | 1 | 232 |  |
Gross Unrealized (Losses) | (7,552) | (1,425) |  |
Estimated Fair Value | 104,945 | 69,149 |  |
Available-for-sale |  |  |  |
Amortized Cost | 4,378,489 | 4,485,548 |  |
Allowance for credit losses on AFS | 0 | 0 |  |
Gross Unrealized Gains | 138 | 6,307 |  |
Gross Unrealized (Losses) | (212,519) | (43,239) |  |
Estimated Fair Value | 4,166,108 | 4,448,616 |  |
State and political subdivisions |  |  |  |
Held-to-maturity |  |  |  |
Amortized Cost | 1,195,744 | 1,210,248 |  |
Allowance for credit losses on HTM | (1,285) | (1,197) | (1,042) | (2,307)
Net Carrying Amount | 1,194,459 | 1,209,051 |  |
Gross Unrealized Gains | 384 | 6,166 |  |
Gross Unrealized (Losses) | (209,191) | (8,462) |  |
Estimated Fair Value | 985,652 | 1,206,755 |  |
Available-for-sale |  |  |  |
Amortized Cost | 1,812,534 | 1,791,097 |  |
Allowance for credit losses on AFS | 0 | 0 | (64) | (217)
Gross Unrealized Gains | 2,727 | 30,556 |  |
Gross Unrealized (Losses) | (161,567) | (1,995) |  |
Estimated Fair Value | 1,653,694 | 1,819,658 |  |
Other securities |  |  |  |
Held-to-maturity |  |  |  |
Amortized Cost | 17,292 | 17,301 |  |
Allowance for credit losses on HTM | (92) | (82) | (576) | (608)
Net Carrying Amount | 17,200 | 17,219 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized (Losses) | (1,899) | (440) |  |
Estimated Fair Value | 15,301 | 16,779 |  |
Available-for-sale |  |  |  |
Amortized Cost | 511,829 | 479,162 |  |
Allowance for credit losses on AFS | 0 | 0 | $ (2,390) | $ (95)
Gross Unrealized Gains | 2,309 | 6,647 |  |
Gross Unrealized (Losses) | (27,102) | (5,479) |  |
Estimated Fair Value | $ 487,036 | $ 480,330 |  |

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