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Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities Available for Sale    
Less than 12 months, Fair Value $ 1,218,843 $ 1,393,098
Less than 12 months, Unrealized Loss (193,869) (14,640)
12 months or more, Fair Value 1,185,676 153,834
12 months or more, Unrealized Loss (97,101) (2,165)
Total, Fair Value 2,404,519 1,546,932
Total, Unrealized Loss (290,970) (16,805)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 0  
Less than 12 Months, Unrealized Loss 0  
12 months or more, Fair Value 148,107  
12 months or more, Unrealized Loss (11,060)  
Total, Fair Value 148,107  
Total, Unrealized Loss (11,060)  
Obligations of U.S. government agencies    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 766,612 947,108
Less than 12 months, Unrealized Loss (134,234) (9,737)
12 months or more, Fair Value 605,615 44,086
12 months or more, Unrealized Loss (61,408) (1,293)
Total, Fair Value 1,372,227 991,194
Total, Unrealized Loss (195,642) (11,030)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 0  
Less than 12 Months, Unrealized Loss 0  
12 months or more, Fair Value 143,577  
12 months or more, Unrealized Loss (11,013)  
Total, Fair Value 143,577  
Total, Unrealized Loss (11,013)  
Obligations of states and political subdivisions    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 43,282 56,153
Less than 12 months, Unrealized Loss (12,917) (785)
12 months or more, Fair Value 219,532 0
12 months or more, Unrealized Loss (26,904) 0
Total, Fair Value 262,814 56,153
Total, Unrealized Loss (39,821) (785)
Debt Securities Held to Maturity    
Less than 12 months, Fair Value 0  
Less than 12 Months, Unrealized Loss 0  
12 months or more, Fair Value 4,530  
12 months or more, Unrealized Loss (47)  
Total, Fair Value 4,530  
Total, Unrealized Loss (47)  
Corporate bonds    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 0  
Less than 12 months, Unrealized Loss 0  
12 months or more, Fair Value 5,751  
12 months or more, Unrealized Loss (413)  
Total, Fair Value 5,751  
Total, Unrealized Loss (413)  
Asset backed securities    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 205,329 62,792
Less than 12 months, Unrealized Loss (10,238) (259)
12 months or more, Fair Value 231,703 109,748
12 months or more, Unrealized Loss (4,955) (872)
Total, Fair Value 437,032 172,540
Total, Unrealized Loss (15,193) (1,131)
Non-agency collateralized mortgage obligations    
Debt Securities Available for Sale    
Less than 12 months, Fair Value 203,620 327,045
Less than 12 months, Unrealized Loss (36,480) (3,859)
12 months or more, Fair Value 123,075 0
12 months or more, Unrealized Loss (3,421) 0
Total, Fair Value 326,695 327,045
Total, Unrealized Loss $ (39,901) $ (3,859)