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Investment Securities - Summary of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities (Detail)
$ in Thousands
Dec. 31, 2025
USD ($)
holding
Dec. 31, 2024
USD ($)
holding
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value $ 729,099 $ 4,094,196
Less Than 12 Months, Unrealized Losses (11,381) (64,068)
12 Months or More, Fair Value 4,336,787 4,043,216
12 Months or More, Unrealized Losses $ (537,639) $ (661,832)
Total, Number of Holdings | holding 623 751
Total, Fair Value $ 5,065,886 $ 8,137,412
Total, Unrealized Losses (549,020) (725,900)
Government agency debentures    
Schedule of Investments [Line Items]    
12 Months or More, Fair Value 197,650 186,427
12 Months or More, Unrealized Losses $ (25,198) $ (36,341)
Total, Number of Holdings | holding 15 15
Total, Fair Value $ 197,650 $ 186,427
Total, Unrealized Losses (25,198) (36,341)
Municipal bonds and notes    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value   859
Less Than 12 Months, Unrealized Losses   (1)
12 Months or More, Fair Value 108,944 108,013
12 Months or More, Unrealized Losses $ (7,131) $ (13,010)
Total, Number of Holdings | holding 36 57
Total, Fair Value $ 108,944 $ 108,872
Total, Unrealized Losses (7,131) (13,011)
Agency CMO    
Schedule of Investments [Line Items]    
12 Months or More, Fair Value 24,856 29,043
12 Months or More, Unrealized Losses $ (1,960) $ (3,150)
Total, Number of Holdings | holding 25 28
Total, Fair Value $ 24,856 $ 29,043
Total, Unrealized Losses (1,960) (3,150)
Agency MBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 15,368 2,624,722
Less Than 12 Months, Unrealized Losses (22) (31,539)
12 Months or More, Fair Value 1,197,592 1,246,818
12 Months or More, Unrealized Losses $ (148,508) $ (220,871)
Total, Number of Holdings | holding 301 370
Total, Fair Value $ 1,212,960 $ 3,871,540
Total, Unrealized Losses (148,530) (252,410)
Agency CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 542,126 1,468,615
Less Than 12 Months, Unrealized Losses (10,939) (32,528)
12 Months or More, Fair Value 2,395,394 1,540,263
12 Months or More, Unrealized Losses $ (327,500) $ (333,185)
Total, Number of Holdings | holding 184 185
Total, Fair Value $ 2,937,520 $ 3,008,878
Total, Unrealized Losses (338,439) (365,713)
CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 151,663  
Less Than 12 Months, Unrealized Losses (362)  
12 Months or More, Fair Value 72,197 457,423
12 Months or More, Unrealized Losses $ (533) $ (6,008)
Total, Number of Holdings | holding 16 32
Total, Fair Value $ 223,860 $ 457,423
Total, Unrealized Losses (895) (6,008)
Corporate debt    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 14,948  
Less Than 12 Months, Unrealized Losses (52)  
12 Months or More, Fair Value 297,613 426,805
12 Months or More, Unrealized Losses $ (23,383) $ (43,755)
Total, Number of Holdings | holding 41 59
Total, Fair Value $ 312,561 $ 426,805
Total, Unrealized Losses (23,435) (43,755)
Private label MBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 38,052 39,219
12 Months or More, Unrealized Losses $ (3,035) $ (4,862)
Total, Number of Holdings | holding 3 3
Total, Fair Value $ 38,052 $ 39,219
Total, Unrealized Losses (3,035) (4,862)
Other    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 4,994  
Less Than 12 Months, Unrealized Losses (6)  
12 Months or More, Fair Value 4,489 9,205
12 Months or More, Unrealized Losses $ (391) $ (650)
Total, Number of Holdings | holding 2 2
Total, Fair Value $ 9,483 $ 9,205
Total, Unrealized Losses $ (397) $ (650)