Short-term Borrowings (Details)	Jun. 30, 2019 USD ($) bank	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Customer repurchase agreements	$ 37,222,000	$ 35,243,000	[1]
FHLB borrowings	13,528,000	0	[1]
Total short-term borrowings	$ 50,750,000	$ 35,243,000
First Two Correspondent Banks
Line of Credit Facility [Line Items]
Federal funds line of credit, number of banks | bank	2
Federal funds line of credit, amount per agreement	$ 15,000,000
Third Correspondent Bank
Line of Credit Facility [Line Items]
Federal funds line of credit, number of banks | bank	1
Federal funds line of credit, amount per agreement	$ 17,500,000

[1] Derived from audited consolidated financial statements.