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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
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)