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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 3,332 $ 3,334
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (48) (17)
Fair Value, 12 Months or Longer, Available-for-sale 2,424,410 2,913,626
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (367,936) (449,850)
Fair Value, Available-for-sale 2,427,742 2,916,960
Gross Unrealized Holding Losses, Available-for-sale (367,984) (449,867)
Fair Value, Less Than 12 Months, Held-to-maturity 12,760 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (101) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 1,917,373 1,938,543
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (344,458) (384,967)
Fair Value, Held-to-maturity 1,930,134 1,959,152
Gross Unrealized Holding Losses, Held-to-maturity (344,558) (385,167)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 371,006 389,359
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (105,044) (112,872)
Fair Value, Available-for-sale 371,006 389,359
Gross Unrealized Holding Losses, Available-for-sale (105,044) (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 643,821 646,737
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (144,801) (156,155)
Fair Value, Held-to-maturity 643,821 646,737
Gross Unrealized Holding Losses, Held-to-maturity (144,801) (156,155)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 9 48
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 2,032,214 2,506,162
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (261,824) (336,107)
Fair Value, Available-for-sale 2,032,223 2,506,210
Gross Unrealized Holding Losses, Available-for-sale (261,825) (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 538,947 565,655
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (85,320) (97,436)
Fair Value, Held-to-maturity 538,947 565,655
Gross Unrealized Holding Losses, Held-to-maturity (85,320) (97,436)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 3,323 3,286
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (48) (17)
Fair Value, 12 Months or Longer, Available-for-sale 21,190 18,105
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,068) (871)
Fair Value, Available-for-sale 24,513 21,391
Gross Unrealized Holding Losses, Available-for-sale (1,115) (888)
Fair Value, Less Than 12 Months, Held-to-maturity 12,760 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (101) (200)
Fair Value, 12 Months or Longer, Held-to-maturity 301,057 293,467
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (29,439) (33,404)
Fair Value, Held-to-maturity 313,817 314,076
Gross Unrealized Holding Losses, Held-to-maturity (29,539) (33,604)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 0  
Gross Unrealized Holding Losses, 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 0
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity 0 0
Fair Value, 12 Months or Longer, Held-to-maturity 433,548 432,684
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (84,898) (97,972)
Fair Value, Held-to-maturity 433,548 432,684
Gross Unrealized Holding Losses, Held-to-maturity $ (84,898) $ (97,972)