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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 510,174 | $ 734,993
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (2,319) | (8,671)
Fair Value, 12 Months or Longer, Available-for-sale | 388,925 | 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (8,109) | (1)
Fair Value, Available-for-sale | 899,099 | 740,974
Gross Unrealized Holding Losses, Available-for-sale | (10,428) | (8,672)
Fair Value, Less Than 12 Months, Held-to-maturity | 102,316 | 652,076
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (707) | (14,383)
Fair Value, 12 Months or Longer, Held-to-maturity | 381,449 | 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (14,240) | (1,057)
Fair Value, Held-to-maturity | 483,765 | 689,047
Gross Unrealized Holding Losses, Held-to-maturity | (14,947) | (15,440)
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 95,137 | 128,595
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (487) | (1,485)
Fair Value, 12 Months or Longer, Available-for-sale | 71,223 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,595) | 0
Fair Value, Available-for-sale | 166,360 | 128,595
Gross Unrealized Holding Losses, Available-for-sale | (2,082) | (1,485)
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 237,611
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 | (6,808)
Fair Value, 12 Months or Longer, Held-to-maturity | 216,431 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (8,641) | 0
Fair Value, Held-to-maturity | 216,431 | 237,611
Gross Unrealized Holding Losses, Held-to-maturity | (8,641) | (6,808)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 18,950 | 76,854
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (27) | (1,972)
Fair Value, 12 Months or Longer, Held-to-maturity | 43,495 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (2,107) | 0
Fair Value, Held-to-maturity | 62,445 | 76,854
Gross Unrealized Holding Losses, Held-to-maturity | (2,134) | (1,972)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 414,091 | 583,143
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (1,828) | (6,232)
Fair Value, 12 Months or Longer, Available-for-sale | 303,746 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (6,274) | 0
Fair Value, Available-for-sale | 717,837 | 583,143
Gross Unrealized Holding Losses, Available-for-sale | (8,102) | (6,232)
Fair Value, Less Than 12 Months, Held-to-maturity | 51,297 | 191,807
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (188) | (1,892)
Fair Value, 12 Months or Longer, Held-to-maturity | 55,306 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (194) | 0
Fair Value, Held-to-maturity | 106,603 | 191,807
Gross Unrealized Holding Losses, Held-to-maturity | (382) | (1,892)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 946 | 23,255
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (4) | (954)
Fair Value, 12 Months or Longer, Available-for-sale | 13,956 | 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (240) | (1)
Fair Value, Available-for-sale | 14,902 | 29,236
Gross Unrealized Holding Losses, Available-for-sale | (244) | (955)
Fair Value, Less Than 12 Months, Held-to-maturity | 32,069 | 145,804
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (492) | (3,711)
Fair Value, 12 Months or Longer, Held-to-maturity | 66,217 | 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (3,298) | (1,057)
Fair Value, Held-to-maturity | 98,286 | 182,775
Gross Unrealized Holding Losses, Held-to-maturity | $ (3,790) | $ (4,768)

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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 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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