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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,184,452,000 | $ 2,384,325,000
Gross Unrealized Gains | 655,000 | 525,000
Gross Unrealized Losses | (244,324,000) | (232,346,000)
Estimated Fair Value | 1,940,783,000 | 2,152,504,000
Debt Securities Held to Maturity |  |
Totals | 122,673,000 | 133,494,000
Gross Unrealized Gains | 4,000 | 6,000
Gross Unrealized Losses | (8,968,000) | (8,374,000)
Estimated Fair Value | 113,709,000 | 125,126,000
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,271,105,000 | 1,386,772,000
Gross Unrealized Gains | 1,000 | 2,000
Gross Unrealized Losses | (178,082,000) | (165,037,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 1,093,024,000 | 1,221,737,000
Debt Securities Held to Maturity |  |
Totals | 119,982,000 | 130,823,000
Gross Unrealized Gains | 3,000 | 0
Gross Unrealized Losses | (8,880,000) | (8,331,000)
Estimated Fair Value | 111,105,000 | 122,492,000
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 251,954,000 | 262,879,000
Gross Unrealized Gains | 85,000 | 268,000
Gross Unrealized Losses | (29,430,000) | (26,772,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 222,609,000 | 236,375,000
Debt Securities Held to Maturity |  |
Totals | 2,691,000 | 2,671,000
Gross Unrealized Gains | 1,000 | 6,000
Gross Unrealized Losses | (88,000) | (43,000)
Estimated Fair Value | 2,604,000 | 2,634,000
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 6,177,000 | 6,173,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (367,000) | (571,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 5,810,000 | 5,602,000
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 344,115,000 | 359,214,000
Gross Unrealized Gains | 569,000 | 255,000
Gross Unrealized Losses | (1,504,000) | (4,188,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 343,180,000 | 355,281,000
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 311,101,000 | 369,287,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (34,941,000) | (35,778,000)
Estimated Fair Value | $ 276,160,000 | $ 333,509,000

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