Credit Quality Indicators. The following table provides the amortized cost of held to maturity debt securities by credit rating as of March 31, 2020 (in thousands):


	March 31, 2020
Total Portfolio	AAA		AA	A	BBB	Not Rated	Total
Agency obligations	$	7,417	—	—	—	—	7,417
Mortgage-backed securities	104		—	—	—	—	104
State and municipal obligations	46,868		326,291	54,414	1,118	—	428,691
Corporate obligations	—		3,121	5,423	750	25	9,319
	$	54,389	329,412	59,837	1,868	25	445,531

	December 31, 2019
Total Portfolio	AAA		AA	A	BBB	Not Rated	Total
Agency obligations	$	6,599	—	—	—	—	6,599
Mortgage-backed securities	118		—	—	—	—	118
State and municipal obligations	49,316		330,322	56,317	1,119	—	437,074
Corporate obligations	—		3,128	6,335	350	25	9,838
	$	56,033	333,450	62,652	1,469	25	453,629

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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