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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans, interest income lost			$ 1,000,000.0	$ 1,500,000
Loans Receivable >90 Days and Accruing	$ 1,749,000		1,749,000	333,000
Loans acquired with deteriorated credit quality, fair value	777,000		777,000	1,100,000
Troubled debt restructurings, subsequent default, amount	$ 134,537	$ 0
Troubled debt restructuring, subsequent default, number | loan	1	1
Number of contracts | loan	3	0
Post-modification outstanding recorded investments	$ 3,225,525
Past due loans	22,660,000		22,660,000	30,879,000
Less Than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	$ 10,100,000		$ 10,100,000	$ 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 receivables that have been modified by troubled debt restructurings.

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Amount, after troubled debt restructuring, of modified financing receivable.

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