Aggreggate fair value and gross unrealized loss of securities - USD ($) $ in Thousands	Sep. 30, 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	$ 1,561
Municipal bonds	2,194	6,273
U.S. Government agencies and U.S. Government - sponsored enterprises	6,729	5,781
Corporate bonds	1,479
Total temporarily impaired securities	11,963	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	31
Municipal bonds	9
U.S. Government agencies and U.S. Government - sponsored enterprises	35
Corporate bonds	21
Total temporarily impaired securities	96
Aggregate Fair Value Gross Unrealized Loss Of Securities 12 Months Or Longer Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	75	195
Municipal bonds
U.S. Government agencies and U.S. Government - sponsored enterprises	65	704
Corporate bonds
Total temporarily impaired securities	140	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
Corporate bonds
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	1,636	195
Municipal bonds	2,194	6,273
U.S. Government agencies and U.S. Government - sponsored enterprises	6,794	6,485
Corporate bonds	1,479
Total temporarily impaired securities	12,103	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	32	1
Municipal bonds	9	73
U.S. Government agencies and U.S. Government - sponsored enterprises	36	24
Corporate bonds	21
Total temporarily impaired securities	$ 98	108
U.S. Government Agencies		$ 10