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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 39,187 $ 3,334
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (149) (17)
Fair Value, 12 Months or Longer, Available-for-sale 2,794,439 2,913,626
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (485,522) (449,850)
Fair Value, Available-for-sale 2,833,626 2,916,960
Gross Unrealized Holding Losses, Available-for-sale (485,671) (449,867)
Fair Value, Less Than 12 Months, Held-to-maturity 46,060 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (649) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 1,892,303 1,938,543
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (412,129) (384,967)
Fair Value, Held-to-maturity 1,938,363 1,959,152
Gross Unrealized Holding Losses, Held-to-maturity (412,778) (385,167)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 0
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 378,893 389,359
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (116,682) (112,872)
Fair Value, Available-for-sale 378,893 389,359
Gross Unrealized Holding Losses, Available-for-sale (116,682) (112,872)
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 635,698 646,737
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (162,528) (156,155)
Fair Value, Held-to-maturity 635,698 646,737
Gross Unrealized Holding Losses, Held-to-maturity (162,528) (156,155)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 32,640 0
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (4) 0
Fair Value, 12 Months or Longer, Available-for-sale 0 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 0
Fair Value, Available-for-sale 32,640 0
Gross Unrealized Holding Losses, Available-for-sale (4) 0
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 423,080 432,684
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (103,672) (97,972)
Fair Value, Held-to-maturity 423,080 432,684
Gross Unrealized Holding Losses, Held-to-maturity (103,672) (97,972)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 22 48
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 2,397,803 2,506,162
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (367,613) (336,107)
Fair Value, Available-for-sale 2,397,825 2,506,210
Gross Unrealized Holding Losses, Available-for-sale (367,613) (336,107)
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 543,529 565,655
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (109,336) (97,436)
Fair Value, Held-to-maturity 543,529 565,655
Gross Unrealized Holding Losses, Held-to-maturity (109,336) (97,436)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 6,525 3,286
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale (145) (17)
Fair Value, 12 Months or Longer, Available-for-sale 17,743 18,105
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,227) (871)
Fair Value, Available-for-sale 24,268 21,391
Gross Unrealized Holding Losses, Available-for-sale (1,372) (888)
Fair Value, Less Than 12 Months, Held-to-maturity 46,060 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (649) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 289,996 293,467
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (36,593) (33,404)
Fair Value, Held-to-maturity 336,056 314,076
Gross Unrealized Holding Losses, Held-to-maturity $ (37,242) $ (33,604)