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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 85,194 $ 207,644
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (159) (855)
Fair Value, 12 Months or Longer, Available-for-sale 2,129,713 2,124,849
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (389,405) (447,326)
Fair Value, Available-for-sale 2,214,907 2,332,493
Gross Unrealized Holding Losses, Available-for-sale (389,564) (448,181)
Fair Value, Less Than 12 Months, Held-to-maturity 77,622 65,740
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (2,430) (1,109)
Fair Value, 12 Months or Longer, Held-to-maturity 1,835,363 1,811,354
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (392,105) (425,372)
Fair Value, Held-to-maturity 1,912,984 1,877,094
Gross Unrealized Holding Losses, Held-to-maturity (394,535) (426,481)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 1
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 353,861 351,521
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (113,401) (120,399)
Fair Value, Available-for-sale 353,861 351,522
Gross Unrealized Holding Losses, Available-for-sale (113,401) (120,399)
Fair Value, Less Than 12 Months, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 0
Fair Value, 12 Months or Longer, Held-to-maturity 617,755 613,937
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (159,636) (170,121)
Fair Value, Held-to-maturity 617,755 613,937
Gross Unrealized Holding Losses, Held-to-maturity (159,636) (170,121)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 0
Fair Value, 12 Months or Longer, Held-to-maturity 416,948 408,257
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (93,645) (106,315)
Fair Value, Held-to-maturity 416,948 408,257
Gross Unrealized Holding Losses, Held-to-maturity (93,645) (106,315)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 85,194 2,072
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (159) (42)
Fair Value, 12 Months or Longer, Available-for-sale 1,756,443 502,292
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (274,534) (109,978)
Fair Value, Available-for-sale 1,841,637 504,364
Gross Unrealized Holding Losses, Available-for-sale (274,693) (110,020)
Fair Value, Less Than 12 Months, Held-to-maturity 2,016 204,428
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (17) (700)
Fair Value, 12 Months or Longer, Held-to-maturity 502,640 1,757,066
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (99,254) (325,677)
Fair Value, Held-to-maturity 504,656 1,961,494
Gross Unrealized Holding Losses, Held-to-maturity (99,271) (326,377)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 63,668
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 (1,067)
Fair Value, 12 Months or Longer, Available-for-sale 19,409 286,868
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,470) (38,958)
Fair Value, Available-for-sale 19,409 350,536
Gross Unrealized Holding Losses, Available-for-sale (1,470) (40,025)
Fair Value, Less Than 12 Months, Held-to-maturity 75,606 3,215
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (2,413) (155)
Fair Value, 12 Months or Longer, Held-to-maturity 298,020 16,262
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (39,569) (1,250)
Fair Value, Held-to-maturity 373,626 19,477
Gross Unrealized Holding Losses, Held-to-maturity $ (41,983) $ (1,405)