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Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities Available for Sale    
Less than 12 months, Fair Value $ 66,657 $ 1,218,843
Less than 12 months, Unrealized Loss (751) (193,869)
12 months or more, Fair Value 1,997,383 1,185,676
12 months or more, Unrealized Loss (231,595) (97,101)
Total, Fair Value 2,064,040 2,404,519
Total, Unrealized Loss (232,346) (290,970)
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 123,271 148,107
12 months or more, Unrealized Loss (8,374) (11,060)
Total, Fair Value 123,271 148,107
Total, Unrealized Loss (8,374) (11,060)
Obligations of U.S. government agencies    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 224 766,612
Less than 12 months, Unrealized Loss 0 (134,234)
12 months or more, Fair Value 1,221,320 605,615
12 months or more, Unrealized Loss (165,037) (61,408)
Total, Fair Value 1,221,544 1,372,227
Total, Unrealized Loss (165,037) (195,642)
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 122,259 143,577
12 months or more, Unrealized Loss (8,331) (11,013)
Total, Fair Value 122,259 143,577
Total, Unrealized Loss (8,331) (11,013)
Obligations of states and political subdivisions    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 6,229 43,282
Less than 12 months, Unrealized Loss (75) (12,917)
12 months or more, Fair Value 216,497 219,532
12 months or more, Unrealized Loss (26,697) (26,904)
Total, Fair Value 222,726 262,814
Total, Unrealized Loss (26,772) (39,821)
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 1,012 4,530
12 months or more, Unrealized Loss (43) (47)
Total, Fair Value 1,012 4,530
Total, Unrealized Loss (43) (47)
Corporate bonds    
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 5,602 5,751
12 months or more, Unrealized Loss (571) (413)
Total, Fair Value 5,602 5,751
Total, Unrealized Loss (571) (413)
Asset backed securities    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 15,928 205,329
Less than 12 months, Unrealized Loss (93) (10,238)
12 months or more, Fair Value 264,731 231,703
12 months or more, Unrealized Loss (4,095) (4,955)
Total, Fair Value 280,659 437,032
Total, Unrealized Loss (4,188) (15,193)
Non-agency collateralized mortgage obligations    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 44,276 203,620
Less than 12 months, Unrealized Loss (583) (36,480)
12 months or more, Fair Value 289,233 123,075
12 months or more, Unrealized Loss (35,195) (3,421)
Total, Fair Value 333,509 326,695
Total, Unrealized Loss $ (35,778) $ (39,901)