Short-term Borrowings (Details)	Mar. 31, 2019 USD ($) bank	Dec. 31, 2018 USD ($)	[1]
Debt Disclosure [Abstract]
Federal funds line of credit, number of banks | bank	2
Federal funds line of credit, amount per agreement	$ 15,000,000
Customer repurchase agreements	$ 35,945,000	$ 35,243,000

[1] Derived from audited consolidated financial statements.