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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, fair value | $ 145,344 | $ 117,107
Less than 12 months, unrealized loss | (692) | (1,029)
12 months or more, fair value | 1,509,970 | 1,546,730
12 months or more, unrealized loss | (202,386) | (233,626)
Total, fair value | 1,655,314 | 1,663,837
Total, unrealized loss | (203,078) | (234,655)
Debt Securities Held to Maturity |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized loss | 0 | 0
12 months or more, fair value | 99,695 | 103,038
12 months or more, unrealized loss | (5,857) | (7,522)
Total, fair value | 99,695 | 103,038
Total, unrealized loss | (5,857) | (7,522)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 46,095 | 63,714
Less than 12 months, unrealized loss | (101) | (842)
12 months or more, fair value | 1,008,710 | 1,021,654
12 months or more, unrealized loss | (147,734) | (173,643)
Total, fair value | 1,054,805 | 1,085,368
Total, unrealized loss | (147,835) | (174,485)
Debt Securities Held to Maturity |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized loss | 0 | 0
12 months or more, fair value | 98,213 | 101,553
12 months or more, unrealized loss | (5,775) | (7,443)
Total, fair value | 98,213 | 101,553
Total, unrealized loss | (5,775) | (7,443)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 10,493 | 7,457
Less than 12 months, unrealized loss | (415) | (140)
12 months or more, fair value | 199,107 | 208,063
12 months or more, unrealized loss | (27,490) | (28,809)
Total, fair value | 209,600 | 215,520
Total, unrealized loss | (27,905) | (28,949)
Debt Securities Held to Maturity |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized loss | 0 | 0
12 months or more, fair value | 1,482 | 1,485
12 months or more, unrealized loss | (82) | (79)
Total, fair value | 1,482 | 1,485
Total, unrealized loss | (82) | (79)
Corporate bonds |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 0 | 1,229
Less than 12 months, unrealized loss | 0 | (17)
12 months or more, fair value | 4,710 | 4,608
12 months or more, unrealized loss | (229) | (328)
Total, fair value | 4,710 | 5,837
Total, unrealized loss | (229) | (345)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 88,756 | 44,707
Less than 12 months, unrealized loss | (176) | (30)
12 months or more, fair value | 76,155 | 75,734
12 months or more, unrealized loss | (1,337) | (1,208)
Total, fair value | 164,911 | 120,441
Total, unrealized loss | (1,513) | (1,238)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, fair value | 0 | 0
Less than 12 months, unrealized loss | 0 | 0
12 months or more, fair value | 221,288 | 236,671
12 months or more, unrealized loss | (25,596) | (29,638)
Total, fair value | 221,288 | 236,671
Total, unrealized loss | $ (25,596) | $ (29,638)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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