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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,517,294 | $ 2,772,453
Gross unrealized gains | 99 | 144
Gross unrealized losses | (334,552) | (311,204)
Fair Value | 2,182,841 | 2,461,393
Debt securities held to maturity |  |
Amortized Cost | 882,614 | 918,312
Gross unrealized gains | 0 | 0
Gross unrealized losses | (180,938) | (133,017)
Fair Value | 701,676 | 785,295
U.S. Treasury securities |  |
Debt securities available for sale |  |
Amortized Cost | 51,522 | 117,805
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1,392) | (3,744)
Fair Value | 50,130 | 114,061
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 10,071 | 20,097
Gross unrealized gains | 2 | 3
Gross unrealized losses | (254) | (321)
Fair Value | 9,819 | 19,779
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 254,549 | 283,481
Gross unrealized gains | 6 | 106
Gross unrealized losses | (27,758) | (26,075)
Fair Value | 226,797 | 257,512
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 486,517 | 489,558
Gross unrealized gains | 0 | 0
Gross unrealized losses | (7,069) | (19,683)
Fair Value | 479,448 | 469,875
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 120,117 | 124,423
Gross unrealized gains | 0 | 0
Gross unrealized losses | (19,817) | (16,029)
Fair Value | 100,300 | 108,394
Debt securities held to maturity |  |
Amortized Cost | 459,866 | 474,820
Gross unrealized gains | 0 | 0
Gross unrealized losses | (93,401) | (63,738)
Fair Value | 366,465 | 411,082
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,343,324 | 1,463,971
Gross unrealized gains | 0 | 2
Gross unrealized losses | (254,528) | (220,717)
Fair Value | 1,088,796 | 1,243,256
Debt securities held to maturity |  |
Amortized Cost | 422,748 | 443,492
Gross unrealized gains | 0 | 0
Gross unrealized losses | (87,537) | (69,279)
Fair Value | 335,211 | 374,213
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 251,194 | 273,118
Gross unrealized gains | 91 | 33
Gross unrealized losses | (23,734) | (24,635)
Fair Value | $ 227,551 | $ 248,516

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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