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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans, interest income lost				$ 673,000		$ 967,000
Loans returned to accrual, interest income			$ 1,100,000	520,000
Past due loans	$ 11,035,000		14,522,000	11,035,000		14,522,000
Loans Receivable >90 Days and Accruing	1,724,000		795,000	1,724,000		795,000
Loans acquired with deteriorated credit quality, fair value	1,100,000		3,500,000	1,100,000		3,500,000
Troubled debt restructurings, amount	$ 458,181	$ 415,652		$ 674,283	$ 1,800,000
Troubled debt restructurings, number | loan	5	3		6	6
Troubled debt restructurings, subsequent default, amount	$ 602,274	$ 105,000		$ 602,274	$ 105,000
Troubled debt restructuring, subsequent default, number | loan	2	1		2	1
Financing receivables	$ 2,427,180,000		2,203,315,000	$ 2,427,180,000		2,203,315,000
Less Than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans	3,700,000		1,600,000	3,700,000		1,600,000
Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	0			0
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	18,100,000			18,100,000
Substandard [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	$ 18,100,000			$ 18,100,000
Acquired loans with deteriorated credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans			3,592,000			3,592,000
Loans Receivable >90 Days and Accruing
Financing receivables			$ 5,610,000			$ 5,610,000

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