Disclosure About Fair Values of Assets and Liabilities - Level 3 (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Collateral-dependent impaired loans | Market Comparable [Member] | Market Based [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 259,678	$ 173,877
Mortgage Servicing Rights [Member] | Discounted Cash Flows [Member] | Prepayment Speeds [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,333,873	$ 2,025,323
Interest rate lock commitments | Secondary market prices | Pull-through rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	85.00%	85.00%
Interest rate lock commitments | Secondary market prices | Pull-through rate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 702,238	$ 498,644
Minimum [Member] | Collateral-dependent impaired loans | Market Comparable [Member] | Market Based [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	10.00%	10.00%
Minimum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flows [Member] | Prepayment Speeds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	159.00%	177.00%
Maximum [Member] | Collateral-dependent impaired loans | Market Comparable [Member] | Market Based [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	15.00%	15.00%
Maximum [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flows [Member] | Prepayment Speeds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	655.00%	565.00%
Weighted Average [Member] | Collateral-dependent impaired loans | Market Comparable [Member] | Market Based [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	12.00%	12.00%
Weighted Average [Member] | Mortgage Servicing Rights [Member] | Discounted Cash Flows [Member] | Prepayment Speeds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Values Inputs Discount Rate	10.00%	10.00%