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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 87,601 $ 1,736,843
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (3,386) (193,815)
Fair Value, 12 Months or Longer, Available-for-sale 2,976,856 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (494,347) (306,377)
Fair Value, Available-for-sale 3,064,457 3,251,395
Gross Unrealized Holding Losses, Available-for-sale (497,733) (500,192)
Fair Value, Less Than 12 Months, Held-to-maturity 245,969 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (9,140) (145,162)
Fair Value, 12 Months or Longer, Held-to-maturity 1,777,733 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (396,568) (254,465)
Fair Value, Held-to-maturity 2,023,702 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity (405,708) (399,627)
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 745 54,005
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (17) (4,796)
Fair Value, 12 Months or Longer, Available-for-sale 407,711 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (111,170) (91,170)
Fair Value, Available-for-sale 408,456 439,300
Gross Unrealized Holding Losses, Available-for-sale (111,187) (95,966)
Fair Value, Less Than 12 Months, Held-to-maturity 47,110 376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (2,884) (60,598)
Fair Value, 12 Months or Longer, Held-to-maturity 615,080 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (152,727) (71,132)
Fair Value, Held-to-maturity 662,190 695,616
Gross Unrealized Holding Losses, Held-to-maturity (155,611) (131,730)
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 80,414 1,658,331
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (3,322) (187,842)
Fair Value, 12 Months or Longer, Available-for-sale 2,551,205 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (381,941) (215,207)
Fair Value, Available-for-sale 2,631,619 2,787,588
Gross Unrealized Holding Losses, Available-for-sale (385,263) (403,049)
Fair Value, Less Than 12 Months, Held-to-maturity 91,805 188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (3,138) (9,042)
Fair Value, 12 Months or Longer, Held-to-maturity 489,463 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (100,511) (96,825)
Fair Value, Held-to-maturity 581,268 600,929
Gross Unrealized Holding Losses, Held-to-maturity (103,649) (105,867)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 6,442 24,507
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (47) (1,177)
Fair Value, 12 Months or Longer, Available-for-sale 17,940 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,236) 0
Fair Value, Available-for-sale 24,382 24,507
Gross Unrealized Holding Losses, Available-for-sale (1,283) (1,177)
Fair Value, Less Than 12 Months, Held-to-maturity 92,899 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (2,499) (35,656)
Fair Value, 12 Months or Longer, Held-to-maturity 253,674 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (38,697) (12,031)
Fair Value, Held-to-maturity 346,573 366,052
Gross Unrealized Holding Losses, Held-to-maturity (41,196) (47,687)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 14,155 179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity (619) (39,866)
Fair Value, 12 Months or Longer, Held-to-maturity 419,516 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (104,633) (74,477)
Fair Value, Held-to-maturity 433,671 434,428
Gross Unrealized Holding Losses, Held-to-maturity $ (105,252) $ (114,343)