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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 2,117,597 | $ 2,655,594
Gross unrealized gains |  | 13,733 | 113,681
Gross unrealized losses |  | 65,346 | 4,950
Securities available for sale, at estimated fair value |  | 2,065,984 | 2,764,325
HELD TO MATURITY |  |  |
Amortized cost |  | 474,319 | 90,780
Gross unrealized gains |  | 1,393 | 4,455
Gross unrealized losses |  | 13,091 | 0
Estimated Fair Value |  | 462,621 | 95,235
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  |  | 58,084
Gross unrealized gains |  |  | 843
Gross unrealized losses |  |  | 50
Securities available for sale, at estimated fair value |  |  | 58,877
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 1,614,421 | 1,962,257
Gross unrealized gains |  | 10,637 | 93,893
Gross unrealized losses |  | 58,873 | 4,214
Securities available for sale, at estimated fair value |  | 1,566,185 | 2,051,936
HELD TO MATURITY |  |  |
Amortized cost |  | 386,573 | 788
Gross unrealized gains |  | 944 | 3
Gross unrealized losses |  | 12,767 | 0
Estimated Fair Value |  | 374,750 | 791
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 144,264 | 133,333
Gross unrealized gains |  | 253 | 2,408
Gross unrealized losses |  | 3,191 | 209
Securities available for sale, at estimated fair value |  | 141,326 | 135,532
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 280,804 | 411,727
Gross unrealized gains | [1] | 2,581 | 14,895
Gross unrealized losses | [1] | 2,694 | 272
Securities available for sale, at estimated fair value | [1] | 280,691 | 426,350
HELD TO MATURITY |  |  |
Amortized cost | [1] | 37,986 | 38,644
Gross unrealized gains | [1] | 387 | 2,103
Gross unrealized losses | [1] | 64 | 0
Estimated Fair Value | [1] | 38,309 | 40,747
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 78,108 | 90,193
Gross unrealized gains | [1] | 262 | 1,642
Gross unrealized losses | [1] | 588 | 205
Securities available for sale, at estimated fair value | [1] | 77,782 | 91,630
HELD TO MATURITY |  |  |
Amortized cost | [1] | 49,760 | 51,348
Gross unrealized gains | [1] | 62 | 2,349
Gross unrealized losses | [1] | 260 | 0
Estimated Fair Value | [1] | $ 49,562 | $ 53,697
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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