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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | $ 1,816,349 | $ 2,655,594
Gross unrealized gains |  | 4,761 | 113,681
Gross unrealized losses |  | 87,756 | 4,950
Securities available for sale, at estimated fair value |  | 1,733,354 | 2,764,325
HELD TO MATURITY |  |  |
Amortized cost |  | 1,083,672 | 90,780
Gross unrealized gains |  | 237 | 4,455
Gross unrealized losses |  | 114,102 | 0
Estimated Fair Value |  | 969,807 | 95,235
US Treasury Securities |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 39,465 | 58,084
Gross unrealized gains |  | 198 | 843
Gross unrealized losses |  | 0 | 50
Securities available for sale, at estimated fair value |  | 39,663 | 58,877
State and political subdivisions |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 1,255,380 | 1,962,257
Gross unrealized gains |  | 1,099 | 93,893
Gross unrealized losses |  | 80,248 | 4,214
Securities available for sale, at estimated fair value |  | 1,176,231 | 2,051,936
HELD TO MATURITY |  |  |
Amortized cost |  | 876,065 | 788
Gross unrealized gains |  | 70 | 3
Gross unrealized losses |  | 108,210 | 0
Estimated Fair Value |  | 767,925 | 791
Corporate bonds and other |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost |  | 60,215 | 133,333
Gross unrealized gains |  | 65 | 2,408
Gross unrealized losses |  | 1,462 | 209
Securities available for sale, at estimated fair value |  | 58,818 | 135,532
HELD TO MATURITY |  |  |
Amortized cost |  | 95,362 |
Gross unrealized gains |  | 112 |
Gross unrealized losses |  | 2,435 |
Estimated Fair Value |  | 93,039 |
Residential |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 451,457 | 411,727
Gross unrealized gains | [1] | 3,399 | 14,895
Gross unrealized losses | [1] | 5,344 | 272
Securities available for sale, at estimated fair value | [1] | 449,512 | 426,350
HELD TO MATURITY |  |  |
Amortized cost | [1] | 65,494 | 38,644
Gross unrealized gains | [1] | 55 | 2,103
Gross unrealized losses | [1] | 2,273 | 0
Estimated Fair Value | [1] | 63,276 | 40,747
Commercial |  |  |
Available-for-sale [Abstract] |  |  |
Amortized Cost | [1] | 9,832 | 90,193
Gross unrealized gains | [1] | 0 | 1,642
Gross unrealized losses | [1] | 702 | 205
Securities available for sale, at estimated fair value | [1] | 9,130 | 91,630
HELD TO MATURITY |  |  |
Amortized cost | [1] | 46,751 | 51,348
Gross unrealized gains | [1] | 0 | 2,349
Gross unrealized losses | [1] | 1,184 | 0
Estimated Fair Value | [1] | $ 45,567 | $ 53,697
[1] | All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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