Borrowed Funds - Summary of Securities Sold Under Agreements to Repurchase (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Balance at period end	$ 1,106,000	$ 1,026,000
Average balance during the period	$ 1,630,000	$ 3,371,000
Average interest rate during the period	0.25%	0.25%
Maximum month-end balance during the period	$ 2,384,000	$ 6,286,000