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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities Available for Sale    
Less than 12 months, Fair Value $ 341,589 $ 1,185,676
Less than 12 months, Unrealized Loss (13,825) (97,101)
12 months or more, Fair Value 1,945,453 1,218,843
12 months or more, Unrealized Loss (259,360) (193,869)
Total, Fair Value 2,287,042 2,404,519
Total, Unrealized Loss (273,185) (290,970)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 40,032 148,107
Less than 12 Months, Unrealized Loss (2,552) (11,060)
12 months or more, Fair Value 93,289 0
12 months or more, Unrealized Loss (8,158) 0
Total, Fair Value 133,321 148,107
Total, Unrealized Loss (10,710) (11,060)
Obligations of U.S. government agencies    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 148,377 605,615
Less than 12 months, Unrealized Loss (9,454) (61,408)
12 months or more, Fair Value 1,160,872 766,612
12 months or more, Unrealized Loss (178,518) (134,234)
Total, Fair Value 1,309,249 1,372,227
Total, Unrealized Loss (187,972) (195,642)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 39,059 143,577
Less than 12 Months, Unrealized Loss (2,530) (11,013)
12 months or more, Fair Value 92,743 0
12 months or more, Unrealized Loss (8,134) 0
Total, Fair Value 131,802 143,577
Total, Unrealized Loss (10,664) (11,013)
Obligations of states and political subdivisions    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 42,997 219,532
Less than 12 months, Unrealized Loss (958) (26,904)
12 months or more, Fair Value 204,574 43,282
12 months or more, Unrealized Loss (31,729) (12,917)
Total, Fair Value 247,571 262,814
Total, Unrealized Loss (32,687) (39,821)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 973 4,530
Less than 12 Months, Unrealized Loss (22) (47)
12 months or more, Fair Value 546 0
12 months or more, Unrealized Loss (24) 0
Total, Fair Value 1,519 4,530
Total, Unrealized Loss (46) (47)
Corporate bonds    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 0 5,751
Less than 12 months, Unrealized Loss 0 (413)
12 months or more, Fair Value 5,501 0
12 months or more, Unrealized Loss (667) 0
Total, Fair Value 5,501 5,751
Total, Unrealized Loss (667) (413)
Asset backed securities    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 88,449 231,703
Less than 12 months, Unrealized Loss (1,240) (4,955)
12 months or more, Fair Value 359,902 205,329
12 months or more, Unrealized Loss (9,670) (10,238)
Total, Fair Value 448,351 437,032
Total, Unrealized Loss (10,910) (15,193)
Non-agency collateralized mortgage obligations    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 61,766 123,075
Less than 12 months, Unrealized Loss (2,173) (3,421)
12 months or more, Fair Value 214,604 203,620
12 months or more, Unrealized Loss (38,776) (36,480)
Total, Fair Value 276,370 326,695
Total, Unrealized Loss $ (40,949) $ (39,901)