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Securities - Summary of Amortized Cost and Estimated Fair Values of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,408,023 | $ 1,619,420
Gross Unrealized Gains | 1,702 | 586
Gross Unrealized Losses | (33,650) | (66,101)
Estimated Fair Value | 1,376,075 | 1,553,905
U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,361,149 | 1,560,265
Gross Unrealized Gains | 1,537 | 415
Gross Unrealized Losses | (31,363) | (62,635)
Estimated Fair Value | 1,331,323 | 1,498,045
U.S. Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,803 | 11,631
Gross Unrealized Gains | 109 | 142
Gross Unrealized Losses | (4) | (3)
Estimated Fair Value | 8,908 | 11,770
Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,211 | 16,459
Gross Unrealized Gains | 21 | 13
Gross Unrealized Losses | (1,230) | (1,677)
Estimated Fair Value | 14,002 | 14,795
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,579 | 10,108
Gross Unrealized Gains | 13 | 16
Gross Unrealized Losses | (97) | (114)
Estimated Fair Value | 6,495 | 10,010
Asset backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,118 | 12,794
Gross Unrealized Gains | 22 |
Gross Unrealized Losses |  | (282)
Estimated Fair Value | 8,140 | 12,512
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,163 | 8,163
Gross Unrealized Losses | (956) | (1,390)
Estimated Fair Value | $ 7,207 | $ 6,773

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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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