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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 32,036 $ 3,334
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (203) (17)
Fair Value, 12 Months or Longer, Available-for-sale 2,705,684 2,913,626
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (487,735) (449,850)
Fair Value, Available-for-sale 2,737,720 2,916,960
Gross Unrealized Holding Losses, Available-for-sale (487,938) (449,867)
Fair Value, Less Than 12 Months, Held-to-maturity 45,913 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (737) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 1,872,891 1,938,543
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (424,535) (384,967)
Fair Value, Held-to-maturity 1,918,804 1,959,152
Gross Unrealized Holding Losses, Held-to-maturity (425,272) (385,167)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 1 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 370,490 389,359
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (119,899) (112,872)
Fair Value, Available-for-sale 370,491 389,359
Gross Unrealized Holding Losses, Available-for-sale (119,899) (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 626,747 646,737
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (167,006) (156,155)
Fair Value, Held-to-maturity 626,747 646,737
Gross Unrealized Holding Losses, Held-to-maturity (167,006) (156,155)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 248 48
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (1) 0
Fair Value, 12 Months or Longer, Available-for-sale 2,314,832 2,506,162
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (365,934) (336,107)
Fair Value, Available-for-sale 2,315,080 2,506,210
Gross Unrealized Holding Losses, Available-for-sale (365,935) (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 528,357 565,655
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (111,532) (97,436)
Fair Value, Held-to-maturity 528,357 565,655
Gross Unrealized Holding Losses, Held-to-maturity (111,532) (97,436)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 3,188 3,286
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (183) (17)
Fair Value, 12 Months or Longer, Available-for-sale 20,362 18,105
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,902) (871)
Fair Value, Available-for-sale 23,550 21,391
Gross Unrealized Holding Losses, Available-for-sale (2,085) (888)
Fair Value, Less Than 12 Months, Held-to-maturity 45,913 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (737) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 300,985 293,467
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (40,121) (33,404)
Fair Value, Held-to-maturity 346,898 314,076
Gross Unrealized Holding Losses, Held-to-maturity (40,858) (33,604)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 28,599 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (19) 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 28,599 0
Gross Unrealized Holding Losses, Available-for-sale (19) 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 416,802 432,684
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (105,876) (97,972)
Fair Value, Held-to-maturity 416,802 432,684
Gross Unrealized Holding Losses, Held-to-maturity $ (105,876) $ (97,972)