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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 1,392,935 | $ 510,174
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (21,113) | (2,319)
Fair Value, 12 Months or Longer, Available-for-sale | 350,287 | 388,925
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (15,390) | (8,109)
Fair Value, Available-for-sale | 1,743,222 | 899,099
Gross Unrealized Holding Losses, Available-for-sale | (36,503) | (10,428)
Fair Value, Less Than 12 Months, Held-to-maturity | 251,263 | 102,316
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (4,161) | (707)
Fair Value, 12 Months or Longer, Held-to-maturity | 363,851 | 381,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (21,699) | (14,240)
Fair Value, Held-to-maturity | 615,114 | 483,765
Gross Unrealized Holding Losses, Held-to-maturity | (25,860) | (14,947)
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 130,072 | 95,137
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (2,291) | (487)
Fair Value, 12 Months or Longer, Available-for-sale | 64,326 | 71,223
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (2,782) | (1,595)
Fair Value, Available-for-sale | 194,398 | 166,360
Gross Unrealized Holding Losses, Available-for-sale | (5,073) | (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 | 206,386 | 216,431
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (12,773) | (8,641)
Fair Value, Held-to-maturity | 206,386 | 216,431
Gross Unrealized Holding Losses, Held-to-maturity | (12,773) | (8,641)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 53,518 | 18,950
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (437) | (27)
Fair Value, 12 Months or Longer, Held-to-maturity | 41,567 | 43,495
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (2,511) | (2,107)
Fair Value, Held-to-maturity | 95,085 | 62,445
Gross Unrealized Holding Losses, Held-to-maturity | (2,948) | (2,134)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 1,253,569 | 414,091
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (18,601) | (1,828)
Fair Value, 12 Months or Longer, Available-for-sale | 272,657 | 303,746
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (11,721) | (6,274)
Fair Value, Available-for-sale | 1,526,226 | 717,837
Gross Unrealized Holding Losses, Available-for-sale | (30,322) | (8,102)
Fair Value, Less Than 12 Months, Held-to-maturity | 106,204 | 51,297
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (2,225) | (188)
Fair Value, 12 Months or Longer, Held-to-maturity | 54,691 | 55,306
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,795) | (194)
Fair Value, Held-to-maturity | 160,895 | 106,603
Gross Unrealized Holding Losses, Held-to-maturity | (4,020) | (382)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 9,294 | 946
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (221) | (4)
Fair Value, 12 Months or Longer, Available-for-sale | 13,304 | 13,956
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (887) | (240)
Fair Value, Available-for-sale | 22,598 | 14,902
Gross Unrealized Holding Losses, Available-for-sale | (1,108) | (244)
Fair Value, Less Than 12 Months, Held-to-maturity | 91,541 | 32,069
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (1,499) | (492)
Fair Value, 12 Months or Longer, Held-to-maturity | 61,207 | 66,217
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (4,620) | (3,298)
Fair Value, Held-to-maturity | 152,748 | 98,286
Gross Unrealized Holding Losses, Held-to-maturity | $ (6,119) | $ (3,790)

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