Securities - Summary of Amortized Cost and Fair Values of Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 3,892	$ 4,395
Held-to-maturity Securities, Gross Unrealized Gains	174	178
Held-to-maturity Securities, Fair Value	4,066	4,573
Obligations of States, Municipalities, and Political Subdivisions
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	3,892	4,395
Held-to-maturity Securities, Gross Unrealized Gains	174	178
Held-to-maturity Securities, Fair Value	$ 4,066	$ 4,573