Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loans by Class) (Details) - Church Loans [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance, Total	$ 10,167	$ 8,957	$ 10,167	$ 8,957	$ 14,081
Recorded Balance, Total	10,103	8,347	10,103	8,347	13,924
Recorded Investment, Total	9,942	8,365	9,942	8,365	13,824
Related Allowance	290	352	290	352	175
Average Recorded Investment, Total	9,962	8,714	11,564	10,738	14,579
Interest Income Recognized, Total	92	60	277	118	1,202
Wholly-Owned First [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance, With no allowance recorded	9,877	6,563	9,877	6,563	12,497
Unpaid Principal Balance, With an allowance recorded	290	877	290	877	290
Recorded Balance, With no allowance recorded	9,813	6,325	9,813	6,325	12,404
Recorded Balance, With an allowance recorded	290	567	290	567	290
Recorded Investment, With no allowance recorded	9,652	6,342	9,652	6,342	12,304
Recorded Investment, With an allowance recorded	290	568	290	568	290
Related Allowance	290	114	290	114	110
Average Recorded Investment, With no allowance recorded	9,672	6,215	10,978	6,018	12,343
Average Recorded Investment, With an allowance recorded	290	1,038	290	2,100	973
Interest Income Recognized, With no allowance recorded	$ 92	60	266	118	1,202
Wholly-Owned Junior [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance, With an allowance recorded		215		215
Recorded Balance, With an allowance recorded		181		181
Recorded Investment, With an allowance recorded		181		181
Related Allowance		135		135
Average Recorded Investment, With an allowance recorded		178		179
Participation First [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unpaid Principal Balance, With an allowance recorded		1,302		1,302	1,294
Recorded Balance, With an allowance recorded		1,274		1,274	1,230
Recorded Investment, With an allowance recorded		1,274		1,274	1,230
Related Allowance		103		103	65
Average Recorded Investment, With no allowance recorded				1,158
Average Recorded Investment, With an allowance recorded		$ 1,283	296	$ 1,283	$ 1,263
Interest Income Recognized, With an allowance recorded			$ 11

Impaired Financing Receivable, Net Loan Principal Balance, Before Discount

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