Allowance for Credit Losses - Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available for Sale
Beginning balance	$ 2	$ 0
Provision for credit loss - securities	142	0
Balance at end of the period	144	0
Held to Maturity
Beginning balance	0	0
Provision for credit loss - securities	0	0
Balance at end of the period	0	0
Total
Beginning balance	2	0
Provision for credit loss - securities	142	0
Balance at end of the period	$ 144	$ 0