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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 1,274,035 $ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (17,077) (2,319)
Fair Value, 12 Months or Longer, Available-for-sale 367,248 388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (14,654) (8,109)
Fair Value, Available-for-sale 1,641,283 899,099
Gross Unrealized Holding Losses, Available-for-sale (31,731) (10,428)
Fair Value, Less Than 12 Months, Held-to-maturity 266,814 102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (3,625) (707)
Fair Value, 12 Months or Longer, Held-to-maturity 361,857 381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (19,762) (14,240)
Fair Value, Held-to-maturity 628,671 483,765
Gross Unrealized Holding Losses, Held-to-maturity (23,387) (14,947)
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 132,728 95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (1,662) (487)
Fair Value, 12 Months or Longer, Available-for-sale 67,578 71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (2,516) (1,595)
Fair Value, Available-for-sale 200,306 166,360
Gross Unrealized Holding Losses, Available-for-sale (4,178) (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 209,529 216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (11,522) (8,641)
Fair Value, Held-to-maturity 209,529 216,431
Gross Unrealized Holding Losses, Held-to-maturity (11,522) (8,641)
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Held-to-maturity 53,538 18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (262) (27)
Fair Value, 12 Months or Longer, Held-to-maturity 42,693 43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (2,191) (2,107)
Fair Value, Held-to-maturity 96,231 62,445
Gross Unrealized Holding Losses, Held-to-maturity (2,453) (2,134)
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 1,131,944 414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (15,259) (1,828)
Fair Value, 12 Months or Longer, Available-for-sale 286,313 303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (11,301) (6,274)
Fair Value, Available-for-sale 1,418,257 717,837
Gross Unrealized Holding Losses, Available-for-sale (26,560) (8,102)
Fair Value, Less Than 12 Months, Held-to-maturity 115,425 51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,649) (188)
Fair Value, 12 Months or Longer, Held-to-maturity 51,956 55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (1,542) (194)
Fair Value, Held-to-maturity 167,381 106,603
Gross Unrealized Holding Losses, Held-to-maturity (3,191) (382)
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale 9,363 946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (156) (4)
Fair Value, 12 Months or Longer, Available-for-sale 13,357 13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale (837) (240)
Fair Value, Available-for-sale 22,720 14,902
Gross Unrealized Holding Losses, Available-for-sale (993) (244)
Fair Value, Less Than 12 Months, Held-to-maturity 97,851 32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity (1,714) (492)
Fair Value, 12 Months or Longer, Held-to-maturity 57,679 66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity (4,507) (3,298)
Fair Value, Held-to-maturity 155,530 98,286
Gross Unrealized Holding Losses, Held-to-maturity $ (6,221) $ (3,790)