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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)