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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,159,708 | $ 2,384,325
Gross Unrealized Gains | 1,099 | 525
Gross Unrealized Losses | (181,537) | (232,346)
Estimated Fair Value | 1,979,270 | 2,152,504
Debt Securities Held to Maturity |  |
Totals | 117,259 | 133,494
Gross Unrealized Gains | 10 | 6
Gross Unrealized Losses | (5,282) | (8,374)
Estimated Fair Value | 111,987 | 125,126
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,234,038 | 1,386,772
Gross Unrealized Gains | 76 | 2
Gross Unrealized Losses | (132,117) | (165,037)
Estimated Fair Value | 1,101,997 | 1,221,737
Debt Securities Held to Maturity |  |
Totals | 114,558 | 130,823
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (5,253) | (8,331)
Estimated Fair Value | 109,309 | 122,492
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 249,709 | 262,879
Gross Unrealized Gains | 159 | 268
Gross Unrealized Losses | (20,526) | (26,772)
Estimated Fair Value | 229,342 | 236,375
Debt Securities Held to Maturity |  |
Totals | 2,701 | 2,671
Gross Unrealized Gains | 6 | 6
Gross Unrealized Losses | (29) | (43)
Estimated Fair Value | 2,678 | 2,634
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 6,179 | 6,173
Gross Unrealized Gains | 20 | 0
Gross Unrealized Losses | (335) | (571)
Estimated Fair Value | 5,864 | 5,602
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 364,561 | 359,214
Gross Unrealized Gains | 492 | 255
Gross Unrealized Losses | (1,513) | (4,188)
Estimated Fair Value | 363,540 | 355,281
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 305,221 | 369,287
Gross Unrealized Gains | 352 | 0
Gross Unrealized Losses | (27,046) | (35,778)
Estimated Fair Value | $ 278,527 | $ 333,509

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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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