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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]  
Fair Value, Less Than 12 Months, Available-for-sale $ 197,806
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (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 330,898
Gross Unrealized Holding Losses, Available-for-sale (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 177,517
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (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 212,082
Gross Unrealized Holding Losses, Available-for-sale (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 20,289
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale (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 118,253
Gross Unrealized Holding Losses, Available-for-sale (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
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale 0
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)