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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 102,632 | $ 197,806
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (214) | (711)
Fair Value, 12 Months or Longer, Available-for-sale |  | 133,092
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale |  | (937)
Fair Value, Available-for-sale | 102,632 | 330,898
Gross Unrealized Holding Losses, Available-for-sale | (214) | (1,648)
Fair Value, Less Than 12 Months, Held-to-maturity |  | 70,250
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity |  | (442)
Fair Value, 12 Months or Longer, Held-to-maturity |  | 215,579
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  | (3,292)
Fair Value, Held-to-maturity |  | 285,829
Gross Unrealized Holding Losses, Held-to-maturity |  | (3,734)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 71,781 | 177,517
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (212) | (705)
Fair Value, 12 Months or Longer, Available-for-sale |  | 34,565
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale |  | (191)
Fair Value, Available-for-sale | 71,781 | 212,082
Gross Unrealized Holding Losses, Available-for-sale | (212) | (896)
Fair Value, Less Than 12 Months, Held-to-maturity |  | 23,897
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity |  | (104)
Fair Value, 12 Months or Longer, Held-to-maturity |  | 166,193
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  | (2,354)
Fair Value, Held-to-maturity |  | 190,090
Gross Unrealized Holding Losses, Held-to-maturity |  | (2,458)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity |  | 28,359
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity |  | (252)
Fair Value, 12 Months or Longer, Held-to-maturity |  | 19,405
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  | (405)
Fair Value, Held-to-maturity |  | 47,764
Gross Unrealized Holding Losses, Held-to-maturity |  | (657)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 30,851 | 20,289
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (2) | (6)
Fair Value, 12 Months or Longer, Available-for-sale |  | 97,964
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale |  | (744)
Fair Value, Available-for-sale | 30,851 | 118,253
Gross Unrealized Holding Losses, Available-for-sale | (2) | (750)
Fair Value, Less Than 12 Months, Held-to-maturity |  | 10,411
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity |  | (54)
Fair Value, 12 Months or Longer, Held-to-maturity |  |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  |
Fair Value, Held-to-maturity |  | 10,411
Gross Unrealized Holding Losses, Held-to-maturity |  | (54)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale |  |
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale |  |
Fair Value, 12 Months or Longer, Available-for-sale |  | 563
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale |  | (2)
Fair Value, Available-for-sale |  | 563
Gross Unrealized Holding Losses, Available-for-sale |  | (2)
Fair Value, Less Than 12 Months, Held-to-maturity |  | 7,583
Gross Unrealized Holding Losses, Less Than 12 Months, Held-to-maturity |  | (32)
Fair Value, 12 Months or Longer, Held-to-maturity |  | 29,981
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  | (533)
Fair Value, Held-to-maturity |  | 37,564
Gross Unrealized Holding Losses, Held-to-maturity |  | $ (565)

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