Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 1,638	$ 2,206
Repurchase Agreements
Securities Sold Under Agreements To Repurchase [Line Items]
Total collateral carrying value	3,058	3,066
Repurchase Agreements | U.S. Government-sponsored mortgage-backed securities
Securities Sold Under Agreements To Repurchase [Line Items]
Total collateral carrying value	$ 3,058	$ 3,066