Quarterly report pursuant to Section 13 or 15(d)

Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail)

v3.20.2
Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Available-for-Sale Within one year, Amortized Cost $ 21,199  
Available-for-Sale Over one year through five years, Amortized Cost 123,194  
Available-for-Sale Over five years through ten years, Amortized Cost 49,545  
Available-for-Sale Over ten years, Amortized Cost 527,245  
Amortized Cost 721,183 $ 629,725
Available-for-Sale Within one year, Estimated Fair Value 21,399  
Available-for-Sale Over one year through five years, Estimated Fair Value 123,602  
Available-for-Sale Over five years through ten years, Estimated Fair Value 49,613  
Available-for-Sale Over ten years, Estimated Fair Value 528,987  
Estimated fair value $ 723,601 $ 634,477