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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,384,325 | $ 2,742,987
Gross Unrealized Gains | 525 | 421
Gross Unrealized Losses | (232,346) | (290,970)
Estimated Fair Value | 2,152,504 | 2,452,438
Debt Securities Held to Maturity |  |
Amortized Cost | 133,494 | 160,983
Gross Unrealized Gains | 6 | 15
Gross Unrealized Losses | (8,374) | (11,060)
Estimated Fair Value | 125,126 | 149,938
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,386,772 | 1,568,408
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | (165,037) | (195,642)
Estimated Fair Value | 1,221,737 | 1,372,769
Debt Securities Held to Maturity |  |
Amortized Cost | 130,823 | 154,830
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (8,331) | (11,013)
Estimated Fair Value | 122,492 | 143,819
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 262,879 | 332,625
Gross Unrealized Gains | 268 | 401
Gross Unrealized Losses | (26,772) | (39,821)
Estimated Fair Value | 236,375 | 293,205
Debt Securities Held to Maturity |  |
Amortized Cost | 2,671 | 6,153
Gross Unrealized Gains | 6 | 13
Gross Unrealized Losses | (43) | (47)
Estimated Fair Value | 2,634 | 6,119
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 6,173 | 6,164
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (571) | (413)
Estimated Fair Value | 5,602 | 5,751
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 359,214 | 454,943
Gross Unrealized Gains | 255 | 17
Gross Unrealized Losses | (4,188) | (15,193)
Estimated Fair Value | 355,281 | 439,767
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 369,287 | 380,847
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (35,778) | (39,901)
Estimated Fair Value | $ 333,509 | $ 340,946

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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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