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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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)

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