Investment Securities - Schedule of Held to maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Held to maturity, Amortized Cost
Due in one year or less	$ 1,000	$ 800
Due after one through five years	19,081	19,389
Due after five through ten years	76,934	50,895
Due after ten years	106,083	47,543
Total investment securities - held to maturity, Amortized Cost	203,098	118,627
Held to maturity, Estimated Fair Value
Due in one year or less	1,000	800
Due after one through five years	19,913	20,194
Due after five through ten years	78,367	52,315
Due after ten years	107,171	47,892
Total investment securities - held to maturity, Estimated Fair Value	$ 206,451	$ 121,201

Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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