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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 734,993 | $ 615,765
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (8,671) | (2,844)
Fair Value, 12 Months or Longer, Available-for-sale | 5,981 | 5,961
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1) | (1)
Fair Value, Available-for-sale | 740,974 | 621,726
Gross Unrealized Holding Losses, Available-for-sale | (8,672) | (2,845)
Fair Value, Less Than 12 Months, Held-to-maturity | 652,076 | 425,374
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (14,383) | (2,746)
Fair Value, 12 Months or Longer, Held-to-maturity | 36,971 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,057) |
Fair Value, Held-to-maturity | 689,047 | 425,374
Gross Unrealized Holding Losses, Held-to-maturity | (15,440) | (2,746)
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 128,595 | 171,923
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (1,485) | (1,074)
Fair Value, Available-for-sale | 128,595 | 171,923
Gross Unrealized Holding Losses, Available-for-sale | (1,485) | (1,074)
Fair Value, Less Than 12 Months, Held-to-maturity | 237,611 |
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (6,808) |
Fair Value, Held-to-maturity | 237,611 |
Gross Unrealized Holding Losses, Held-to-maturity | (6,808) |
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale |  | 5,745
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale |  | (7)
Fair Value, Available-for-sale |  | 5,745
Gross Unrealized Holding Losses, Available-for-sale |  | (7)
Fair Value, Less Than 12 Months, Held-to-maturity | 76,854 | 84,495
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (1,972) | (734)
Fair Value, Held-to-maturity | 76,854 | 84,495
Gross Unrealized Holding Losses, Held-to-maturity | (1,972) | (734)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 583,143 | 437,699
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (6,232) | (1,761)
Fair Value, Available-for-sale | 583,143 | 437,699
Gross Unrealized Holding Losses, Available-for-sale | (6,232) | (1,761)
Fair Value, Less Than 12 Months, Held-to-maturity | 191,807 | 230,760
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (1,892) | (1,293)
Fair Value, Held-to-maturity | 191,807 | 230,760
Gross Unrealized Holding Losses, Held-to-maturity | (1,892) | (1,293)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 23,255 | 398
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (954) | (2)
Fair Value, 12 Months or Longer, Available-for-sale | 5,981 | 5,961
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1) | (1)
Fair Value, Available-for-sale | 29,236 | 6,359
Gross Unrealized Holding Losses, Available-for-sale | (955) | (3)
Fair Value, Less Than 12 Months, Held-to-maturity | 145,804 | 110,119
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (3,711) | (719)
Fair Value, 12 Months or Longer, Held-to-maturity | 36,971 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,057) |
Fair Value, Held-to-maturity | 182,775 | 110,119
Gross Unrealized Holding Losses, Held-to-maturity | $ (4,768) | $ (719)

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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