Investment Securities - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	$ 177,960	$ 182,961
Obligations of state and political subdivisions
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	162,330	$ 166,386
Obligations of state and political subdivisions | Aaa / AAA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	80,815
Obligations of state and political subdivisions | Aa1 / AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	33,066
Obligations of state and political subdivisions | Aa2/ AA
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	38,317
Obligations of state and political subdivisions | Aa3 / AA-
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	8,292
Obligations of state and political subdivisions | A2 / A
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	1,840
U.S. Government-sponsored enterprise obligations
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Securities held to maturity	$ 15,600