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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 3,334 $ 1,736,843
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (17) (193,815)
Fair Value, 12 Months or Longer, Available-for-sale 2,913,626 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (449,850) (306,377)
Fair Value, Available-for-sale 2,916,960 3,251,395
Gross Unrealized Holding Losses, Available-for-sale (449,867) (500,192)
Fair Value, Less Than 12 Months, Held-to-maturity 20,609 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (200) (145,162)
Fair Value, 12 Months or Longer, Held-to-maturity 1,938,543 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (384,967) (254,465)
Fair Value, Held-to-maturity 1,959,152 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity (385,167) (399,627)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 54,005
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 (4,796)
Fair Value, 12 Months or Longer, Available-for-sale 389,359 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (112,872) (91,170)
Fair Value, Available-for-sale 389,359 439,300
Gross Unrealized Holding Losses, Available-for-sale (112,872) (95,966)
Fair Value, Less Than 12 Months, Held-to-maturity 0 376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 (60,598)
Fair Value, 12 Months or Longer, Held-to-maturity 646,737 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (156,155) (71,132)
Fair Value, Held-to-maturity 646,737 695,616
Gross Unrealized Holding Losses, Held-to-maturity (156,155) (131,730)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0  
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0  
Fair Value, 12 Months or Longer, Available-for-sale 0  
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0  
Fair Value, Available-for-sale 0  
Gross Unrealized Holding Losses, Available-for-sale 0  
Fair Value, Less Than 12 Months, Held-to-maturity 0 179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 (39,866)
Fair Value, 12 Months or Longer, Held-to-maturity 432,684 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (97,972) (74,477)
Fair Value, Held-to-maturity 432,684 434,428
Gross Unrealized Holding Losses, Held-to-maturity (97,972) (114,343)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 48 1,658,331
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 (187,842)
Fair Value, 12 Months or Longer, Available-for-sale 2,506,162 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (336,107) (215,207)
Fair Value, Available-for-sale 2,506,210 2,787,588
Gross Unrealized Holding Losses, Available-for-sale (336,107) (403,049)
Fair Value, Less Than 12 Months, Held-to-maturity 0 188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 (9,042)
Fair Value, 12 Months or Longer, Held-to-maturity 565,655 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (97,436) (96,825)
Fair Value, Held-to-maturity 565,655 600,929
Gross Unrealized Holding Losses, Held-to-maturity (97,436) (105,867)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 3,286 24,507
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (17) (1,177)
Fair Value, 12 Months or Longer, Available-for-sale 18,105 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (871) 0
Fair Value, Available-for-sale 21,391 24,507
Gross Unrealized Holding Losses, Available-for-sale (888) (1,177)
Fair Value, Less Than 12 Months, Held-to-maturity 20,609 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (200) (35,656)
Fair Value, 12 Months or Longer, Held-to-maturity 293,467 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (33,404) (12,031)
Fair Value, Held-to-maturity 314,076 366,052
Gross Unrealized Holding Losses, Held-to-maturity $ (33,604) $ (47,687)