Quarterly report pursuant to Section 13 or 15(d)

Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail)

v3.20.2
Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail)
$ in Thousands
Sep. 30, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (388) $ (318)
Available-for-Sale Within One Year, Estimated Fair Value $ 185,199 $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security 34 33
Available-for-Sale More than One Year, Gross Unrealized Loss   $ (483)
Available-for-Sale More than One Year, Estimated Fair Value   $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security   51
Available-for-Sale, Gross Unrealized Loss $ (388) $ (801)
Available-for-Sale, Estimated Fair Value $ 185,199 $ 162,606
Available-for-Sale, Number of Securities | Security 34 84
Mortgage-backed securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (275) $ (186)
Available-for-Sale Within One Year, Estimated Fair Value $ 121,963 $ 51,261
Available-for-Sale Within One Year, Number of Securities | Security 19 17
Available-for-Sale More than One Year, Gross Unrealized Loss   $ (161)
Available-for-Sale More than One Year, Estimated Fair Value   $ 18,757
Available-for-Sale More than One Year, Number of Securities | Security   14
Available-for-Sale, Gross Unrealized Loss $ (275) $ (347)
Available-for-Sale, Estimated Fair Value $ 121,963 $ 70,018
Available-for-Sale, Number of Securities | Security 19 31
Collateralized mortgage obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (112) $ (112)
Available-for-Sale Within One Year, Estimated Fair Value $ 59,737 $ 41,419
Available-for-Sale Within One Year, Number of Securities | Security 14 14
Available-for-Sale More than One Year, Gross Unrealized Loss   $ (320)
Available-for-Sale More than One Year, Estimated Fair Value   $ 39,936
Available-for-Sale More than One Year, Number of Securities | Security   36
Available-for-Sale, Gross Unrealized Loss $ (112) $ (432)
Available-for-Sale, Estimated Fair Value $ 59,737 $ 81,355
Available-for-Sale, Number of Securities | Security 14 50
Debt securities    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (1) $ (20)
Available-for-Sale Within One Year, Estimated Fair Value $ 3,499 $ 8,235
Available-for-Sale Within One Year, Number of Securities | Security 1 2
Available-for-Sale More than One Year, Gross Unrealized Loss   $ (3)
Available-for-Sale More than One Year, Estimated Fair Value   $ 2,997
Available-for-Sale More than One Year, Number of Securities | Security   1
Available-for-Sale, Gross Unrealized Loss $ (1) $ (22)
Available-for-Sale, Estimated Fair Value $ 3,499 $ 11,233
Available-for-Sale, Number of Securities | Security 1 3
Total U.S. government agency and sponsored agency obligations    
Summary of Investment Holdings [Line Items]    
Available-for-Sale Within One Year, Gross Unrealized Loss $ (388) $ (318)
Available-for-Sale Within One Year, Estimated Fair Value $ 185,199 $ 100,916
Available-for-Sale Within One Year, Number of Securities | Security 34 33
Available-for-Sale More than One Year, Gross Unrealized Loss   $ (483)
Available-for-Sale More than One Year, Estimated Fair Value   $ 61,690
Available-for-Sale More than One Year, Number of Securities | Security   51
Available-for-Sale, Gross Unrealized Loss $ (388) $ (801)
Available-for-Sale, Estimated Fair Value $ 185,199 $ 162,606
Available-for-Sale, Number of Securities | Security 34 84