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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,509,623,000 | $ 2,742,987,000
Gross Unrealized Gains | 415,000 | 421,000
Gross Unrealized Losses | (335,701,000) | (290,970,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 2,174,337,000 | 2,452,438,000
Debt Securities Held to Maturity |  |
Amortized Cost | 139,058,000 | 160,983,000
Gross Unrealized Gains | 0 | 15,000
Gross Unrealized Losses | (15,000,000) | (11,060,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 124,058,000 | 149,938,000
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,443,038,000 | 1,568,408,000
Gross Unrealized Gains | 0 | 3,000
Gross Unrealized Losses | (235,866,000) | (195,642,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 1,207,172,000 | 1,372,769,000
Debt Securities Held to Maturity |  |
Amortized Cost | 136,398,000 | 154,830,000
Gross Unrealized Gains | 0 | 2,000
Gross Unrealized Losses | (14,824,000) | (11,013,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 121,574,000 | 143,819,000
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 307,291,000 | 332,625,000
Gross Unrealized Gains | 24,000 | 401,000
Gross Unrealized Losses | (48,646,000) | (39,821,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 258,669,000 | 293,205,000
Debt Securities Held to Maturity |  |
Amortized Cost | 2,660,000 | 6,153,000
Gross Unrealized Gains | 0 | 13,000
Gross Unrealized Losses | (176,000) | (47,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 2,484,000 | 6,119,000
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 6,170,000 | 6,164,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (665,000) | (413,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 5,505,000 | 5,751,000
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 375,068,000 | 454,943,000
Gross Unrealized Gains | 391,000 | 17,000
Gross Unrealized Losses | (5,730,000) | (15,193,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 369,729,000 | 439,767,000
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 378,056,000 | 380,847,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (44,794,000) | (39,901,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | $ 333,262,000 | $ 340,946,000

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