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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 1,343,756 $ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (27,917) (2,319)
Fair Value, 12 Months or Longer, Available-for-sale 361,619 388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (18,049) (8,109)
Fair Value, Available-for-sale 1,705,375 899,099
Gross Unrealized Holding Losses, Available-for-sale (45,966) (10,428)
Fair Value, Less Than 12 Months, Held-to-maturity 317,204 102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (7,675) (707)
Fair Value, 12 Months or Longer, Held-to-maturity 363,027 381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (24,824) (14,240)
Fair Value, Held-to-maturity 680,231 483,765
Gross Unrealized Holding Losses, Held-to-maturity (32,499) (14,947)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 139,064 95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (3,053) (487)
Fair Value, 12 Months or Longer, Available-for-sale 60,925 71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (3,114) (1,595)
Fair Value, Available-for-sale 199,989 166,360
Gross Unrealized Holding Losses, Available-for-sale (6,167) (2,082)
Fair Value, Less Than 12 Months, Held-to-maturity 0 0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity 0 0
Fair Value, 12 Months or Longer, Held-to-maturity 203,020 216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (13,960) (8,641)
Fair Value, Held-to-maturity 203,020 216,431
Gross Unrealized Holding Losses, Held-to-maturity (13,960) (8,641)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 99,203 18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (2,326) (27)
Fair Value, 12 Months or Longer, Held-to-maturity 40,539 43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,803) (2,107)
Fair Value, Held-to-maturity 139,742 62,445
Gross Unrealized Holding Losses, Held-to-maturity (5,129) (2,134)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 1,193,435 414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (24,475) (1,828)
Fair Value, 12 Months or Longer, Available-for-sale 287,707 303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (13,733) (6,274)
Fair Value, Available-for-sale 1,481,142 717,837
Gross Unrealized Holding Losses, Available-for-sale (38,208) (8,102)
Fair Value, Less Than 12 Months, Held-to-maturity 101,083 51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (3,206) (188)
Fair Value, 12 Months or Longer, Held-to-maturity 52,184 55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,296) (194)
Fair Value, Held-to-maturity 153,267 106,603
Gross Unrealized Holding Losses, Held-to-maturity (5,502) (382)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 11,257 946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (389) (4)
Fair Value, 12 Months or Longer, Available-for-sale 12,987 13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (1,202) (240)
Fair Value, Available-for-sale 24,244 14,902
Gross Unrealized Holding Losses, Available-for-sale (1,591) (244)
Fair Value, Less Than 12 Months, Held-to-maturity 116,918 32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (2,143) (492)
Fair Value, 12 Months or Longer, Held-to-maturity 67,284 66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (5,765) (3,298)
Fair Value, Held-to-maturity 184,202 98,286
Gross Unrealized Holding Losses, Held-to-maturity $ (7,908) $ (3,790)