Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of March 31, 2021 (in thousands):


	March 31, 2021
Total Portfolio	AAA		AA	A	BBB	Not Rated	Total
Agency obligations	$	8,998	—	—	—	—	8,998
Mortgage-backed securities	50		—	—	—	—	50
State and municipal obligations	57,207		308,572	51,678	1,115	10,059	428,631
Corporate obligations	—		3,087	7,188	—	25	10,300
	$	66,255	311,659	58,866	1,115	10,084	447,979

	December 31, 2020
Total Portfolio	AAA		AA	A	BBB	Not Rated	Total
Agency obligations	$	7,600	—	—	—	—	7,600
Mortgage-backed securities	62		—	—	—	—	62
State and municipal obligations	57,830		311,155	53,302	1,115	10,253	433,655
Corporate obligations	—		3,255	6,446	—	25	9,726
	$	65,492	314,410	59,748	1,115	10,278	451,043

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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