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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 0 | $ 738,461
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | (5,417)
Fair Value, 12 Months or Longer, Available-for-sale | 303,729 | 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (2,792) | (20,197)
Fair Value, Available-for-sale | 303,729 | 1,481,071
Gross Unrealized Holding Losses, Available-for-sale | (2,792) | (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity | 10,722 | 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (45) | (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity | 365,628 | 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (6,393) | (22,754)
Fair Value, Held-to-maturity | 376,350 | 565,123
Gross Unrealized Holding Losses, Held-to-maturity | (6,438) | (24,031)
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | (365)
Fair Value, 12 Months or Longer, Available-for-sale | 71,924 | 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (334) | (3,160)
Fair Value, Available-for-sale | 71,924 | 171,644
Gross Unrealized Holding Losses, Available-for-sale | (334) | (3,525)
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 | 201,974 | 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (4,358) | (12,081)
Fair Value, Held-to-maturity | 201,974 | 203,254
Gross Unrealized Holding Losses, Held-to-maturity | (4,358) | (12,081)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 7,479
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 | (15)
Fair Value, 12 Months or Longer, Held-to-maturity | 39,016 | 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (414) | (2,607)
Fair Value, Held-to-maturity |  | 62,423
Gross Unrealized Holding Losses, Held-to-maturity | (414) | (2,622)
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 692,311
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | (4,864)
Fair Value, 12 Months or Longer, Available-for-sale | 228,518 | 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (2,417) | (16,082)
Fair Value, Available-for-sale | 228,518 | 1,285,678
Gross Unrealized Holding Losses, Available-for-sale | (2,417) | (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity | 10,722 | 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (45) | (484)
Fair Value, 12 Months or Longer, Held-to-maturity | 75,536 | 90,863
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (370) | (2,656)
Fair Value, Held-to-maturity | 86,258 | 150,734
Gross Unrealized Holding Losses, Held-to-maturity | (415) | (3,140)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 9,568
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | (188)
Fair Value, 12 Months or Longer, Available-for-sale | 3,287 | 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (41) | (955)
Fair Value, Available-for-sale | 3,287 | 23,749
Gross Unrealized Holding Losses, Available-for-sale | (41) | (1,143)
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 70,989
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | 0 | (778)
Fair Value, 12 Months or Longer, Held-to-maturity | 49,102 | 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (1,251) | (5,410)
Fair Value, Held-to-maturity | 49,102 | 148,712
Gross Unrealized Holding Losses, Held-to-maturity | $ (1,251) | $ (6,188)

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