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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Fair Value, Less Than 12 Months, Available-for-sale $ 169,193 $ 197,806
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (350) (711)
Fair Value, 12 Months or Longer, Available-for-sale 0 133,092
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 (937)
Fair Value, Available-for-sale 169,193 330,898
Gross Unrealized Holding Losses, Available-for-sale (350) (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 96,974 177,517
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (249) (705)
Fair Value, 12 Months or Longer, Available-for-sale 0 34,565
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 (191)
Fair Value, Available-for-sale 96,974 212,082
Gross Unrealized Holding Losses, Available-for-sale (249) (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 72,219 20,289
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (101) (6)
Fair Value, 12 Months or Longer, Available-for-sale 0 97,964
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 (744)
Fair Value, Available-for-sale 72,219 118,253
Gross Unrealized Holding Losses, Available-for-sale (101) (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   0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity   0
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 0 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0 0
Fair Value, 12 Months or Longer, Available-for-sale 0 563
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale 0 (2)
Fair Value, Available-for-sale 0 563
Gross Unrealized Holding Losses, Available-for-sale $ 0 (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)