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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 40,636 $ 1,736,843
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (484) (193,815)
Fair Value, 12 Months or Longer, Available-for-sale 2,829,568 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (627,964) (306,377)
Fair Value, Available-for-sale 2,870,204 3,251,395
Gross Unrealized Holding Losses, Available-for-sale (628,448) (500,192)
Fair Value, Less Than 12 Months, Held-to-maturity 109,966 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (7,127) (145,162)
Fair Value, 12 Months or Longer, Held-to-maturity 1,855,992 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (513,000) (254,465)
Fair Value, Held-to-maturity 1,965,958 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity (520,127) (399,627)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 3 54,005
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 (4,796)
Fair Value, 12 Months or Longer, Available-for-sale 377,495 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (136,663) (91,170)
Fair Value, Available-for-sale 377,498 439,300
Gross Unrealized Holding Losses, Available-for-sale (136,663) (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 617,769 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (194,237) (71,132)
Fair Value, Held-to-maturity 617,769 695,616
Gross Unrealized Holding Losses, Held-to-maturity (194,237) (131,730)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 825 1,658,331
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (16) (187,842)
Fair Value, 12 Months or Longer, Available-for-sale 2,435,125 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (488,743) (215,207)
Fair Value, Available-for-sale 2,435,950 2,787,588
Gross Unrealized Holding Losses, Available-for-sale (488,759) (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 539,123 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (134,290) (96,825)
Fair Value, Held-to-maturity 539,123 600,929
Gross Unrealized Holding Losses, Held-to-maturity (134,290) (105,867)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 5,699 24,507
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (451) (1,177)
Fair Value, 12 Months or Longer, Available-for-sale 16,948 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,558) 0
Fair Value, Available-for-sale 22,647 24,507
Gross Unrealized Holding Losses, Available-for-sale (3,009) (1,177)
Fair Value, Less Than 12 Months, Held-to-maturity 109,966 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (7,127) (35,656)
Fair Value, 12 Months or Longer, Held-to-maturity 288,267 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (60,492) (12,031)
Fair Value, Held-to-maturity 398,233 366,052
Gross Unrealized Holding Losses, Held-to-maturity (67,619) (47,687)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 34,109  
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (17)  
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 34,109  
Gross Unrealized Holding Losses, Available-for-sale (17)  
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 410,833 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (123,981) (74,477)
Fair Value, Held-to-maturity 410,833 434,428
Gross Unrealized Holding Losses, Held-to-maturity $ (123,981) $ (114,343)