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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | $ 611,922 | $ 1,185,676
Less than 12 months, Unrealized Loss | (30,589) | (97,101)
12 months or more, Fair Value | 1,725,941 | 1,218,843
12 months or more, Unrealized Loss | (225,977) | (193,869)
Total, Fair Value | 2,337,863 | 2,404,519
Total, Unrealized Loss | (256,566) | (290,970)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 42,439 | 148,107
Less than 12 Months, Unrealized Loss | (2,257) | (11,060)
12 months or more, Fair Value | 97,370 | 0
12 months or more, Unrealized Loss | (7,690) | 0
Total, Fair Value | 139,809 | 148,107
Total, Unrealized Loss | (9,947) | (11,060)
Obligations of U.S. government agencies |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 298,264 | 605,615
Less than 12 months, Unrealized Loss | (18,024) | (61,408)
12 months or more, Fair Value | 1,058,654 | 766,612
12 months or more, Unrealized Loss | (156,305) | (134,234)
Total, Fair Value | 1,356,918 | 1,372,227
Total, Unrealized Loss | (174,329) | (195,642)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 41,389 | 143,577
Less than 12 Months, Unrealized Loss | (2,252) | (11,013)
12 months or more, Fair Value | 97,370 | 0
12 months or more, Unrealized Loss | (7,690) | 0
Total, Fair Value | 138,759 | 143,577
Total, Unrealized Loss | (9,942) | (11,013)
Obligations of states and political subdivisions |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 126,230 | 219,532
Less than 12 months, Unrealized Loss | (7,797) | (26,904)
12 months or more, Fair Value | 105,039 | 43,282
12 months or more, Unrealized Loss | (21,130) | (12,917)
Total, Fair Value | 231,269 | 262,814
Total, Unrealized Loss | (28,927) | (39,821)
Debt Securities Held to Maturity |  |
Less than 12 months, Fair Value | 1,050 | 4,530
Less than 12 Months, Unrealized Loss | (5) | (47)
12 months or more, Fair Value | 0 | 0
12 months or more, Unrealized Loss | 0 | 0
Total, Fair Value | 1,050 | 4,530
Total, Unrealized Loss | (5) | (47)
Corporate bonds |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 1,846 | 5,751
Less than 12 months, Unrealized Loss | (135) | (413)
12 months or more, Fair Value | 3,892 | 0
12 months or more, Unrealized Loss | (292) | 0
Total, Fair Value | 5,738 | 5,751
Total, Unrealized Loss | (427) | (413)
Asset backed securities |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 112,239 | 231,703
Less than 12 months, Unrealized Loss | (1,994) | (4,955)
12 months or more, Fair Value | 309,739 | 205,329
12 months or more, Unrealized Loss | (10,919) | (10,238)
Total, Fair Value | 421,978 | 437,032
Total, Unrealized Loss | (12,913) | (15,193)
Non-agency collateralized mortgage obligations |  |
Debt Securities Available for Sale |  |
Less than 12 months, Fair Value | 73,343 | 123,075
Less than 12 months, Unrealized Loss | (2,639) | (3,421)
12 months or more, Fair Value | 248,617 | 203,620
12 months or more, Unrealized Loss | (37,331) | (36,480)
Total, Fair Value | 321,960 | 326,695
Total, Unrealized Loss | $ (39,970) | $ (39,901)

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