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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 409,154 | $ 734,993
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (4,832) | (8,671)
Fair Value, 12 Months or Longer, Available-for-sale | 39,450 | 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (405) | (1)
Fair Value, Available-for-sale | 448,604 | 740,974
Gross Unrealized Holding Losses, Available-for-sale | (5,237) | (8,672)
Fair Value, Less Than 12 Months, Held-to-maturity | 343,270 | 652,076
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (8,242) | (14,383)
Fair Value, 12 Months or Longer, Held-to-maturity | 87,600 | 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (3,302) | (1,057)
Fair Value, Held-to-maturity | 430,870 | 689,047
Gross Unrealized Holding Losses, Held-to-maturity | (11,544) | (15,440)
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 42,017 | 128,595
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (463) | (1,485)
Fair Value, 12 Months or Longer, Available-for-sale | 33,454 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (404) | 0
Fair Value, Available-for-sale | 75,471 | 128,595
Gross Unrealized Holding Losses, Available-for-sale | (867) | (1,485)
Fair Value, Less Than 12 Months, Held-to-maturity | 173,752 | 237,611
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (5,200) | (6,808)
Fair Value, 12 Months or Longer, Held-to-maturity | 49,268 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,665) | 0
Fair Value, Held-to-maturity | 223,020 | 237,611
Gross Unrealized Holding Losses, Held-to-maturity | (6,865) | (6,808)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 39,929 | 76,854
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (1,305) | (1,972)
Fair Value, 12 Months or Longer, Held-to-maturity | 5,411 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (184) | 0
Fair Value, Held-to-maturity | 45,340 | 76,854
Gross Unrealized Holding Losses, Held-to-maturity | (1,489) | (1,972)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 352,129 | 583,143
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (4,102) | (6,232)
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | 352,129 | 583,143
Gross Unrealized Holding Losses, Available-for-sale | (4,102) | (6,232)
Fair Value, Less Than 12 Months, Held-to-maturity | 62,677 | 191,807
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (61) | (1,892)
Fair Value, 12 Months or Longer, Held-to-maturity | 0 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 | 0
Fair Value, Held-to-maturity | 62,677 | 191,807
Gross Unrealized Holding Losses, Held-to-maturity | (61) | (1,892)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 15,008 | 23,255
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (267) | (954)
Fair Value, 12 Months or Longer, Available-for-sale | 5,996 | 5,981
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1) | (1)
Fair Value, Available-for-sale | 21,004 | 29,236
Gross Unrealized Holding Losses, Available-for-sale | (268) | (955)
Fair Value, Less Than 12 Months, Held-to-maturity | 66,912 | 145,804
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (1,676) | (3,711)
Fair Value, 12 Months or Longer, Held-to-maturity | 32,921 | 36,971
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,453) | (1,057)
Fair Value, Held-to-maturity | 99,833 | 182,775
Gross Unrealized Holding Losses, Held-to-maturity | $ (3,129) | $ (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=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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