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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans, interest income lost	$ 343,000		$ 1,500,000
Loans Receivable >90 Days and Accruing	0		333,000
Loans acquired with deteriorated credit quality, fair value	884,000		1,100,000
Troubled debt restructurings, subsequent default, amount	$ 127,449	$ 0
Troubled debt restructuring, subsequent default, number | loan	1
Past due loans	$ 31,062,000		30,879,000
Less Than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	$ 7,300,000		$ 11,900,000

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of financing receivable 90 days or more past due and still accruing.

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