Borrowed Funds - Summary of Securities Sold Under Agreements to Repurchase (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Balance at period end	$ 1,418,000	$ 1,106,000
Average balance during the period	$ 13,872,000	$ 1,630,000
Average interest rate during the period	0.13%	0.25%
Maximum month-end balance during the period	$ 23,908,000	$ 2,384,000