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

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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