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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Held-to-maturity |  |  |
Amortized Cost | $ 1,530,500 | $ 335,946 |
Allowance for Credit Losses | (1,279) | (2,915) | $ 0
Net Carrying Amount | 1,529,221 | 333,031 |
Gross Unrealized Gains | 6,398 | 8,924 |
Gross Unrealized (Losses) | (18,241) | (30) |
Estimated Fair Value | 1,517,378 | 341,925 |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 7,130,861 | 3,397,043 |
Allowance for Credit Losses | 0 | (312) | 0
Gross Unrealized Gains | 44,005 | 79,663 |
Gross Unrealized (Losses) | (61,321) | (2,796) |
Estimated Fair Value | 7,113,545 | 3,473,598 |
U.S. Treasury |  |  |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 300 |  |
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  |
Gross Unrealized (Losses) | 0 |  |
Estimated Fair Value | 300 |  |
U.S. Government agencies |  |  |
Held-to-maturity |  |  |
Amortized Cost | 232,609 |  |
Allowance for Credit Losses | 0 |  |
Net Carrying Amount | 232,609 |  |
Gross Unrealized Gains | 0 |  |
Gross Unrealized (Losses) | (7,914) |  |
Estimated Fair Value | 224,695 |  |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 374,754 | 477,693 |
Allowance for Credit Losses | 0 | 0 |
Gross Unrealized Gains | 495 | 844 |
Gross Unrealized (Losses) | (10,608) | (1,300) |
Estimated Fair Value | 364,641 | 477,237 |
Mortgage-backed securities |  |  |
Held-to-maturity |  |  |
Amortized Cost | 70,342 | 22,354 |
Allowance for Credit Losses | 0 | 0 |
Net Carrying Amount | 70,342 | 22,354 |
Gross Unrealized Gains | 232 | 683 |
Gross Unrealized (Losses) | (1,425) | 0 |
Estimated Fair Value | 69,149 | 23,037 |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 4,485,548 | 1,374,769 |
Allowance for Credit Losses | 0 | 0 |
Gross Unrealized Gains | 6,307 | 21,261 |
Gross Unrealized (Losses) | (43,239) | (1,094) |
Estimated Fair Value | 4,448,616 | 1,394,936 |
State and political subdivisions |  |  |
Held-to-maturity |  |  |
Amortized Cost | 1,210,248 | 312,416 |
Allowance for Credit Losses | (1,197) | (2,307) | 0
Net Carrying Amount | 1,209,051 | 310,109 |
Gross Unrealized Gains | 6,166 | 8,148 |
Gross Unrealized (Losses) | (8,462) | (30) |
Estimated Fair Value | 1,206,755 | 318,227 |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 1,791,097 | 1,416,136 |
Allowance for Credit Losses | 0 | (217) | 0
Gross Unrealized Gains | 30,556 | 55,111 |
Gross Unrealized (Losses) | (1,995) | (307) |
Estimated Fair Value | 1,819,658 | 1,470,723 |
Other securities |  |  |
Held-to-maturity |  |  |
Amortized Cost | 17,301 | 1,176 |
Allowance for Credit Losses | (82) | (608) | 0
Net Carrying Amount | 17,219 | 568 |
Gross Unrealized Gains | 0 | 93 |
Gross Unrealized (Losses) | (440) | 0 |
Estimated Fair Value | 16,779 | 661 |
Available-for-sale |  |  |
Available-for-sale, amortized cost | 479,162 | 128,445 |
Allowance for Credit Losses | 0 | (95) | $ 0
Gross Unrealized Gains | 6,647 | 2,447 |
Gross Unrealized (Losses) | (5,479) | (95) |
Estimated Fair Value | $ 480,330 | $ 130,702 |

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