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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
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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)

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