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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities Available for Sale |  |
Amortized Cost | $ 2,815,167,000 | $ 2,208,330,000
Gross Unrealized Gains | 772,000 | 16,413,000
Gross Unrealized Losses | (209,874,000) | (16,805,000)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 2,606,065,000 | 2,207,938,000
Debt Securities Held to Maturity |  |
Amortized Cost | 176,794,000 | 199,759,000
Gross Unrealized Gains | 53,000 | 8,381,000
Gross Unrealized Losses | (5,705,000) | 0
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 171,142,000 | 208,140,000
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Amortized Cost | 1,671,797,000 | 1,260,226,000
Gross Unrealized Gains | 363,000 | 8,193,000
Gross Unrealized Losses | (135,329,000) | (11,030,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 1,536,831,000 | 1,257,389,000
Debt Securities Held to Maturity |  |
Amortized Cost | 170,337,000 | 192,068,000
Gross Unrealized Gains | 12,000 | 8,131,000
Gross Unrealized Losses | (5,679,000) | 0
Estimated Fair Value | 164,670,000 | 200,199,000
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Amortized Cost | 333,709,000 | 187,197,000
Gross Unrealized Gains | 305,000 | 5,832,000
Gross Unrealized Losses | (30,320,000) | (785,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 303,694,000 | 192,244,000
Debt Securities Held to Maturity |  |
Amortized Cost | 6,457,000 | 7,691,000
Gross Unrealized Gains | 41,000 | 250,000
Gross Unrealized Losses | (26,000) | 0
Estimated Fair Value | 6,472,000 | 7,941,000
Corporate bonds |  |
Debt Securities Available for Sale |  |
Amortized Cost | 7,659,000 | 6,722,000
Gross Unrealized Gains | 0 | 34,000
Gross Unrealized Losses | (115,000) | 0
Estimated Fair Value | 7,544,000 | 6,756,000
Asset backed securities |  |
Debt Securities Available for Sale |  |
Amortized Cost | 448,742,000 | 408,329,000
Gross Unrealized Gains | 104,000 | 2,354,000
Gross Unrealized Losses | (14,654,000) | (1,131,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | 434,192,000 | 409,552,000
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Amortized Cost | 353,260,000 | 345,856,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (29,456,000) | (3,859,000)
Allowance for Credit Losses | 0 |
Estimated Fair Value | $ 323,804,000 | $ 341,997,000

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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