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Investment Securities - Summary of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total available-for-sale $ 9,720,415 $ 9,668,422
Unrealized Gains 12,952 50,673
Unrealized Losses (725,900) (759,366)
Allowance for Credit Losses (867) 0
Fair Value [1] 9,006,600 8,959,729
Debt Securities, Available-For-Sale    
Schedule of Investments [Line Items]    
Interest receivable 35,200 42,500
Government agency debentures    
Schedule of Investments [Line Items]    
Total available-for-sale 222,767 302,212
Unrealized Gains 0 0
Unrealized Losses (36,341) (37,579)
Allowance for Credit Losses 0 0
Fair Value 186,426 264,633
Municipal bonds and notes    
Schedule of Investments [Line Items]    
Total available-for-sale 123,885 1,626,126
Unrealized Gains 2 8
Unrealized Losses (13,011) (52,901)
Allowance for Credit Losses 0 0
Fair Value 110,876 1,573,233
Agency CMO    
Schedule of Investments [Line Items]    
Total available-for-sale 32,193 52,994
Unrealized Gains 0 0
Unrealized Losses (3,150) (4,053)
Allowance for Credit Losses 0 0
Fair Value 29,043 48,941
Agency MBS    
Schedule of Investments [Line Items]    
Total available-for-sale 4,760,541 3,568,140
Unrealized Gains 11,654 32,461
Unrealized Losses (252,410) (253,503)
Allowance for Credit Losses 0 0
Fair Value 4,519,785 3,347,098
Agency CMBS    
Schedule of Investments [Line Items]    
Total available-for-sale 3,400,021 2,569,438
Unrealized Gains 84 18,204
Unrealized Losses (365,713) (299,571)
Allowance for Credit Losses 0 0
Fair Value 3,034,392 2,288,071
CMBS    
Schedule of Investments [Line Items]    
Total available-for-sale 630,985 788,478
Unrealized Gains 411 0
Unrealized Losses (6,008) (24,729)
Allowance for Credit Losses 0 0
Fair Value 625,388 763,749
Corporate debt    
Schedule of Investments [Line Items]    
Total available-for-sale 496,087 704,569
Unrealized Gains 801 0
Unrealized Losses (43,755) (82,414)
Allowance for Credit Losses (867) 0
Fair Value 452,266 622,155
Private label MBS    
Schedule of Investments [Line Items]    
Total available-for-sale 44,081 46,635
Unrealized Gains 0 0
Unrealized Losses (4,862) (3,827)
Allowance for Credit Losses 0 0
Fair Value 39,219 42,808
Other    
Schedule of Investments [Line Items]    
Total available-for-sale 9,855 9,830
Unrealized Gains 0 0
Unrealized Losses (650) (789)
Allowance for Credit Losses 0 0
Fair Value $ 9,205 $ 9,041
[1] Investment securities available-for-sale had an amortized cost basis of $9,720,415 at December 31, 2024, and $9,668,422 at December 31, 2023.