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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,742,987 | $ 2,208,330
Gross Unrealized Gains | 421 | 16,413
Gross Unrealized Losses | (290,970) | (16,805)
Estimated Fair Value | 2,452,438 | 2,207,938
Debt Securities Held to Maturity |  |
Amortized Cost | 160,983 | 199,759
Gross Unrealized Gains | 15 | 8,381
Gross Unrealized Losses | (11,060) | 0
Estimated Fair Value | 149,938 | 208,140
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,568,408 | 1,260,226
Gross Unrealized Gains | 3 | 8,193
Gross Unrealized Losses | (195,642) | (11,030)
Estimated Fair Value | 1,372,769 | 1,257,389
Debt Securities Held to Maturity |  |
Amortized Cost | 154,830 | 192,068
Gross Unrealized Gains | 2 | 8,131
Gross Unrealized Losses | (11,013) | 0
Estimated Fair Value | 143,819 | 200,199
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 332,625 | 187,197
Gross Unrealized Gains | 401 | 5,832
Gross Unrealized Losses | (39,821) | (785)
Estimated Fair Value | 293,205 | 192,244
Debt Securities Held to Maturity |  |
Amortized Cost | 6,153 | 7,691
Gross Unrealized Gains | 13 | 250
Gross Unrealized Losses | (47) | 0
Estimated Fair Value | 6,119 | 7,941
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 6,164 | 6,722
Gross Unrealized Gains | 0 | 34
Gross Unrealized Losses | (413) | 0
Estimated Fair Value | 5,751 | 6,756
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 454,943 | 408,329
Gross Unrealized Gains | 17 | 2,354
Gross Unrealized Losses | (15,193) | (1,131)
Estimated Fair Value | 439,767 | 409,552
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 380,847 | 345,856
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (39,901) | (3,859)
Estimated Fair Value | $ 340,946 | $ 341,997

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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