Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 1,307	$ 2,206
Repurchase Agreements | Overnight and continuous
Securities Sold Under Agreements To Repurchase [Line Items]
Total collateral carrying value	3,007	3,066
Repurchase Agreements | U.S. Government-sponsored mortgage-backed securities | Overnight and continuous
Securities Sold Under Agreements To Repurchase [Line Items]
Total collateral carrying value	$ 3,007	$ 3,066