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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 478,982 $ 356,234
Less than 12 Months, Unrealized Losses (10,541) (12,782)
12 Months or More, Fair Value 1,414,307 1,778,899
12 Months or More, Unrealized Losses (102,757) (116,764)
Total, Fair Value 1,893,289 2,135,133
Total, Unrealized Losses (113,298) (129,546)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 42,665 64,029
12 Months or More, Unrealized Losses (2,771) (4,027)
Total, Fair Value 42,665 64,029
Total, Unrealized Losses (2,771) (4,027)
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 58,493  
Less than 12 Months, Unrealized Losses (188)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total, Fair Value 58,493  
Total, Unrealized Losses (188)  
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 109,465 116,908
12 Months or More, Unrealized Losses (12,257) (12,681)
Total, Fair Value 109,465 116,908
Total, Unrealized Losses (12,257) (12,681)
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 64,227  
Less than 12 Months, Unrealized Losses (1,495)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total, Fair Value 64,227  
Total, Unrealized Losses (1,495)  
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 57,745 29,241
Less than 12 Months, Unrealized Losses (454) (392)
12 Months or More, Fair Value 278,681 438,551
12 Months or More, Unrealized Losses (5,965) (10,626)
Total, Fair Value 336,426 467,792
Total, Unrealized Losses (6,419) (11,018)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 99,022 121,636
12 Months or More, Unrealized Losses (1,588) (4,249)
Total, Fair Value 99,022 121,636
Total, Unrealized Losses (1,588) (4,249)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 65,085 23,243
Less than 12 Months, Unrealized Losses (1,610) (1,147)
12 Months or More, Fair Value 311,986 424,768
12 Months or More, Unrealized Losses (33,972) (33,764)
Total, Fair Value 377,071 448,011
Total, Unrealized Losses (35,582) (34,911)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 233,432 303,750
Less than 12 Months, Unrealized Losses (6,794) (11,243)
12 Months or More, Fair Value 572,488 613,007
12 Months or More, Unrealized Losses (46,204) (51,417)
Total, Fair Value 805,920 916,757
Total, Unrealized Losses $ (52,998) $ (62,660)