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Investment Securities - Summary of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities (Detail)
$ in Thousands
Dec. 31, 2024
USD ($)
holding
Dec. 31, 2023
USD ($)
holding
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value $ 4,094,196 $ 567,445
Less Than 12 Months, Unrealized Losses (64,068) (17,416)
12 Months or More, Fair Value 4,043,216 6,499,763
12 Months or More, Unrealized Losses $ (661,832) $ (741,950)
Total, Number of Holdings | holding 751 1,181
Total, Fair Value $ 8,137,412 $ 7,067,208
Total, Unrealized Losses (725,900) (759,366)
Government agency debentures    
Schedule of Investments [Line Items]    
12 Months or More, Fair Value 186,427 264,633
12 Months or More, Unrealized Losses $ (36,341) $ (37,579)
Total, Number of Holdings | holding 15 19
Total, Fair Value $ 186,427 $ 264,633
Total, Unrealized Losses (36,341) (37,579)
Municipal bonds and notes    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 859 18,066
Less Than 12 Months, Unrealized Losses (1) (124)
12 Months or More, Fair Value 108,013 1,536,656
12 Months or More, Unrealized Losses $ (13,010) $ (52,777)
Total, Number of Holdings | holding 57 386
Total, Fair Value $ 108,872 $ 1,554,722
Total, Unrealized Losses (13,011) (52,901)
Agency CMO    
Schedule of Investments [Line Items]    
12 Months or More, Fair Value 29,043 48,941
12 Months or More, Unrealized Losses $ (3,150) $ (4,053)
Total, Number of Holdings | holding 28 36
Total, Fair Value $ 29,043 $ 48,941
Total, Unrealized Losses (3,150) (4,053)
Agency MBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 2,624,722 71,187
Less Than 12 Months, Unrealized Losses (31,539) (272)
12 Months or More, Fair Value 1,246,818 1,945,221
12 Months or More, Unrealized Losses $ (220,871) $ (253,231)
Total, Number of Holdings | holding 370 457
Total, Fair Value $ 3,871,540 $ 2,016,408
Total, Unrealized Losses (252,410) (253,503)
Agency CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 1,468,615 430,070
Less Than 12 Months, Unrealized Losses (32,528) (16,137)
12 Months or More, Fair Value 1,540,263 1,314,681
12 Months or More, Unrealized Losses $ (333,185) $ (283,434)
Total, Number of Holdings | holding 185 145
Total, Fair Value $ 3,008,878 $ 1,744,751
Total, Unrealized Losses (365,713) (299,571)
CMBS    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value   43,844
Less Than 12 Months, Unrealized Losses   (856)
12 Months or More, Fair Value 457,423 719,905
12 Months or More, Unrealized Losses $ (6,008) $ (23,873)
Total, Number of Holdings | holding 32 42
Total, Fair Value $ 457,423 $ 763,749
Total, Unrealized Losses (6,008) (24,729)
Corporate debt    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 0 4,278
Less Than 12 Months, Unrealized Losses 0 (27)
12 Months or More, Fair Value 426,805 617,877
12 Months or More, Unrealized Losses $ (43,755) $ (82,387)
Total, Number of Holdings | holding 59 91
Total, Fair Value $ 426,805 $ 622,155
Total, Unrealized Losses (43,755) (82,414)
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 39,219 42,808
12 Months or More, Unrealized Losses $ (4,862) $ (3,827)
Total, Number of Holdings | holding 3 3
Total, Fair Value $ 39,219 $ 42,808
Total, Unrealized Losses (4,862) (3,827)
Other    
Schedule of Investments [Line Items]    
12 Months or More, Fair Value 9,205 9,041
12 Months or More, Unrealized Losses $ (650) $ (789)
Total, Number of Holdings | holding 2 2
Total, Fair Value $ 9,205 $ 9,041
Total, Unrealized Losses $ (650) $ (789)