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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 491,430 $ 356,234
Less than 12 Months, Unrealized Losses (10,535) (12,782)
12 Months or More, Fair Value 1,690,547 1,778,899
12 Months or More, Unrealized Losses (112,720) (116,764)
Total, Fair Value 2,181,977 2,135,133
Total, Unrealized Losses (123,255) (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 52,676 64,029
12 Months or More, Unrealized Losses (3,261) (4,027)
Total, Fair Value 52,676 64,029
Total, Unrealized Losses (3,261) (4,027)
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 47,014  
Less than 12 Months, Unrealized Losses (114)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total, Fair Value 47,014  
Total, Unrealized Losses (114)  
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 12,283 0
Less than 12 Months, Unrealized Losses (105) 0
12 Months or More, Fair Value 112,675 116,908
12 Months or More, Unrealized Losses (13,510) (12,681)
Total, Fair Value 124,958 116,908
Total, Unrealized Losses (13,615) (12,681)
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 26,582  
Less than 12 Months, Unrealized Losses (872)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total, Fair Value 26,582  
Total, Unrealized Losses (872)  
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 114,173 29,241
Less than 12 Months, Unrealized Losses (779) (392)
12 Months or More, Fair Value 429,799 438,551
12 Months or More, Unrealized Losses (8,017) (10,626)
Total, Fair Value 543,972 467,792
Total, Unrealized Losses (8,796) (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 112,626 121,636
12 Months or More, Unrealized Losses (1,819) (4,249)
Total, Fair Value 112,626 121,636
Total, Unrealized Losses (1,819) (4,249)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 30,829 23,243
Less than 12 Months, Unrealized Losses (532) (1,147)
12 Months or More, Fair Value 410,323 424,768
12 Months or More, Unrealized Losses (36,201) (33,764)
Total, Fair Value 441,152 448,011
Total, Unrealized Losses (36,733) (34,911)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 260,549 303,750
Less than 12 Months, Unrealized Losses (8,133) (11,243)
12 Months or More, Fair Value 572,448 613,007
12 Months or More, Unrealized Losses (49,912) (51,417)
Total, Fair Value 832,997 916,757
Total, Unrealized Losses $ (58,045) $ (62,660)