Borrowed Funds - Term Notes from the FHLB (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Apr. 03, 2020	Dec. 31, 2019
Borrowed funds
Long-term notes from the FHLB	$ 36,610		$ 30,822
Fixed interest rate note, originated in April 2007, due in April 2022, with interest of 5.18% payable monthly
Borrowed funds
Long-term notes from the FHLB	$ 810		$ 822
Interest rate on debt security	5.18%		5.18%
Fixed interest rate notes, originating in November 2019, due between November 2022 and November 2024, with interest of between 1.74% and 1.81% and interest-only payments monthly
Borrowed funds
Long-term notes from the FHLB	$ 30,000		$ 30,000
Fixed interest rate notes, originating in November 2019, due between November 2022 and November 2024, with interest of between 1.74% and 1.81% and interest-only payments monthly | Minimum
Borrowed funds
Interest rate on debt security	1.74%		1.74%
Fixed interest rate notes, originating in November 2019, due between November 2022 and November 2024, with interest of between 1.74% and 1.81% and interest-only payments monthly | Maximum
Borrowed funds
Interest rate on debt security	1.81%		1.81%
Fixed Interest Rate Note, Originated In December 2017, Due In December 2020
Borrowed funds
Long-term notes from the FHLB	$ 5,800		$ 0
Interest rate on debt security	2.18%	2.18%