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Debt Securities - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,875,848 | $ 4,013,523
Gross unrealized gains | 60 | 22,382
Gross unrealized losses | (328,867) | (54,654)
Fair Value | 2,547,041 | 3,981,251
Debt securities held to maturity |  |
Amortized Cost | 936,328 | 0
Gross unrealized gains | 0 |
Gross unrealized losses | (127,443) |
Fair Value | 808,885 |
U.S. Treasury securities |  |
Debt securities available for sale |  |
Amortized Cost | 145,495 | 166,768
Gross unrealized gains | 0 | 41
Gross unrealized losses | (4,653) | (1,047)
Fair Value | 140,842 | 165,762
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 25,287 | 37,579
Gross unrealized gains | 4 | 891
Gross unrealized losses | (358) | 0
Fair Value | 24,933 | 38,470
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 298,653 | 300,602
Gross unrealized gains | 35 | 7,760
Gross unrealized losses | (27,853) | (1,493)
Fair Value | 270,835 | 306,869
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 490,076 | 492,055
Gross unrealized gains | 0 | 295
Gross unrealized losses | (23,552) | (164)
Fair Value | 466,524 | 492,186
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 98,719 | 625,339
Gross unrealized gains | 0 | 3,425
Gross unrealized losses | (10,968) | (13,766)
Fair Value | 87,751 | 614,998
Debt securities held to maturity |  |
Amortized Cost | 486,116 |
Gross unrealized gains | 0 |
Gross unrealized losses | (60,341) |
Fair Value | 425,775 |
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,538,308 | 2,095,104
Gross unrealized gains | 1 | 8,889
Gross unrealized losses | (233,995) | (34,680)
Fair Value | 1,304,314 | 2,069,313
Debt securities held to maturity |  |
Amortized Cost | 450,212 |
Gross unrealized gains | 0 |
Gross unrealized losses | (67,102) |
Fair Value | 383,110 |
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 279,310 | 296,076
Gross unrealized gains | 20 | 1,081
Gross unrealized losses | (27,488) | (3,504)
Fair Value | $ 251,842 | $ 293,653

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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