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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 197,806 | $ 738,461
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (711) | (5,417)
Fair Value, 12 Months or Longer, Available-for-sale | 133,092 | 742,610
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (937) | (20,197)
Fair Value, Available-for-sale | 330,898 | 1,481,071
Gross Unrealized Holding Losses, Available-for-sale | (1,648) | (25,614)
Fair Value, Less Than 12 Months, Held-to-maturity | 70,250 | 138,339
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (442) | (1,277)
Fair Value, 12 Months or Longer, Held-to-maturity | 215,579 | 426,784
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (3,292) | (22,754)
Fair Value, Held-to-maturity | 285,829 | 565,123
Gross Unrealized Holding Losses, Held-to-maturity | (3,734) | (24,031)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 177,517 | 36,582
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (705) | (365)
Fair Value, 12 Months or Longer, Available-for-sale | 34,565 | 135,062
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (191) | (3,160)
Fair Value, Available-for-sale | 212,082 | 171,644
Gross Unrealized Holding Losses, Available-for-sale | (896) | (3,525)
Fair Value, Less Than 12 Months, Held-to-maturity | 23,897 | 0
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (104) | 0
Fair Value, 12 Months or Longer, Held-to-maturity | 166,193 | 203,254
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (2,354) | (12,081)
Fair Value, Held-to-maturity | 190,090 | 203,254
Gross Unrealized Holding Losses, Held-to-maturity | (2,458) | (12,081)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 28,359 | 7,479
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (252) | (15)
Fair Value, 12 Months or Longer, Held-to-maturity | 19,405 | 54,944
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (405) | (2,607)
Fair Value, Held-to-maturity | 47,764 | 62,423
Gross Unrealized Holding Losses, Held-to-maturity | (657) | (2,622)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 20,289 | 692,311
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (6) | (4,864)
Fair Value, 12 Months or Longer, Available-for-sale | 97,964 | 593,367
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (744) | (16,082)
Fair Value, Available-for-sale | 118,253 | 1,285,678
Gross Unrealized Holding Losses, Available-for-sale | (750) | (20,946)
Fair Value, Less Than 12 Months, Held-to-maturity | 10,411 | 59,871
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (54) | (484)
Fair Value, 12 Months or Longer, Held-to-maturity | 0 | 90,863
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 0 | (2,656)
Fair Value, Held-to-maturity | 10,411 | 150,734
Gross Unrealized Holding Losses, Held-to-maturity | (54) | (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 | 563 | 14,181
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (2) | (955)
Fair Value, Available-for-sale | 563 | 23,749
Gross Unrealized Holding Losses, Available-for-sale | (2) | (1,143)
Fair Value, Less Than 12 Months, Held-to-maturity | 7,583 | 70,989
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity | (32) | (778)
Fair Value, 12 Months or Longer, Held-to-maturity | 29,981 | 77,723
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (533) | (5,410)
Fair Value, Held-to-maturity | 37,564 | 148,712
Gross Unrealized Holding Losses, Held-to-maturity | $ (565) | $ (6,188)

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