aggregate fair value and gross unrealized loss of securities that have been in a continuous unrealized loss position (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Aggregate Fair Value Gross Unrealized Loss Of Securities Less Than 12 Months Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	$ 17,155	$ 2,553
Municipal bonds	2,896	558
U.S. Government agencies and U.S. Government - sponsored enterprises	30,869	3,761
U.S. Government agencies	1,429
Total temporarily impaired securities	52,349	6,872
Aggregate Fair Value Gross Unrealized Loss Of Securities Less Than 12 Months Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes	62	36
Municipal bonds	20	1
U.S. Government agencies and U.S. Government - sponsored enterprises	441	42
U.S. Government agencies	10
Total temporarily impaired securities	533	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
Municipal bonds
U.S. Government agencies and U.S. Government - sponsored enterprises		45
U.S. Government agencies
Total temporarily impaired securities		65
Aggregate Fair Value Gross Unrealized Loss Of Securities 12 Months Or Longer Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes		1
Municipal bonds
U.S. Government agencies and U.S. Government - sponsored enterprises		1
U.S. Government agencies
Total temporarily impaired securities		2
Aggregate Fair Value Gross Unrealized Loss Of Securities Total Fair Value [Member]
Available-for-sale
U.S. Government Agency notes	17,155	2,573
Municipal bonds	2,896	558
U.S. Government agencies and U.S. Government - sponsored enterprises	30,869	3,806
U.S. Government agencies	1,429
Total temporarily impaired securities	52,349	6,937
Aggregate Fair Value Gross Unrealized Loss Of Securities Total Unrealized Losses [Member]
Available-for-sale
U.S. Government Agency notes	62	37
Municipal bonds	20	1
U.S. Government agencies and U.S. Government - sponsored enterprises	441	43
U.S. Government agencies	10
Total temporarily impaired securities	$ 533	$ 81