Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Held to Maturity Securities, Contractual Maturities) (Details)	Jun. 30, 2021 USD ($)
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Less Than One Year, Amortized Cost	$ 142,477
One – Five Years, Amortized Cost	6,927,928
Five – Ten Years, Amortized Cost	87,928,114
After Ten Years, Amortized Cost	213,736,570
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	586,101,589
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Less Than One Year, Fair Value	137,897
One – Five Years, Fair Value	6,944,786
Five – Ten Years, Fair Value	88,881,575
After Ten Years, Fair Value	220,192,955
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	$ 600,587,107

Amortized cost 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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