aggregate fair value and gross unrealized loss of securities that have been in a continuous unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale
U.S. Government Agency notes
Municipal bonds		73
U.S. Government agencies and U.S. Government - sponsored enterprises		22
Total temporarily impaired securities		105
U.S. Government Agencies		10
Aggregate Fair Value Gross Unrealized Loss Of Securities Less Than 12 Months Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	$ 2,553
Municipal bonds	558	6,273
U.S. Government agencies and U.S. Government - sponsored enterprises	3,761	5,781
Total temporarily impaired securities	6,872	13,492
U.S. Government Agencies		1,438
Aggregate Fair Value Gross Unrealized Loss Of Securities Less Than 12 Months Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes	36
Municipal bonds	1
U.S. Government agencies and U.S. Government - sponsored enterprises	42
Total temporarily impaired securities	79
Aggregate Fair Value Gross Unrealized Loss Of Securities 12 Months Or Longer Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	20	195
Municipal bonds
U.S. Government agencies and U.S. Government - sponsored enterprises	45	704
Total temporarily impaired securities	65	899
U.S. Government Agencies
Aggregate Fair Value Gross Unrealized Loss Of Securities 12 Months Or Longer Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes	1	1
Municipal bonds
U.S. Government agencies and U.S. Government - sponsored enterprises	1	2
Total temporarily impaired securities	2	3
U.S. Government Agencies
Aggregate Fair Value Gross Unrealized Loss Of Securities Total Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	2,573	195
Municipal bonds	558	6,273
U.S. Government agencies and U.S. Government - sponsored enterprises	3,806	6,485
Total temporarily impaired securities	6,937	14,391
U.S. Government Agencies		1,438
Aggregate Fair Value Gross Unrealized Loss Of Securities Total Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes	37	1
Municipal bonds	1	73
U.S. Government agencies and U.S. Government - sponsored enterprises	43	24
Total temporarily impaired securities	$ 81	108
U.S. Government Agencies		$ 10