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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unpaid Principal Balance	$ 28,915,000		$ 23,601,000
Recorded Balance	26,259,000		21,598,000
Allowance for Credit Losses	2,715,000		1,931,000
Other real estate owned	13,339,000		2,489,000
Mortgage servicing rights (MSR) impairment (recovery)	369,000
Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Finite-lived intangible assets, net	551,000	$ 1,296,000	516,000	$ 1,444,000
Mortgage servicing rights (MSR) impairment (recovery)	(210,000)	$ 18,000	$ 273,000
Fair Value, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unpaid Principal Balance	15,429,000
Recorded Balance	2,696,000
Allowance for Credit Losses	12,733,000
Fair Value, Nonrecurring | Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Indefinite-lived contractual rights	920,000
Finite-lived intangible assets, net	551,000
Fair Value, Nonrecurring | Carrying Amount
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned	13,339,000
Fair Value, Nonrecurring | Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other real estate owned	$ 11,292,000

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of allowance for credit losses related to recorded investment.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights with an indefinite period of benefit that arose from a contractual arrangement with a third party (not including franchise rights and license agreements).

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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