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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Assets:
Investment securities available-for-sale	$ 405,848	$ 359,866
Other investments, at cost	1,699	2,053
Financial liabilities:
Non-interest bearing demand	414,707	385,511	$ 385,511
Interest bearing demand deposits and money market accounts	566,899		520,205
Savings	130,984		123,032
Total deposits	1,271,440	1,189,413	1,189,413
Financial liabilities:
Time deposits	158,850		$ 160,665
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Cash and short term investments	112,866	64,992
Investment securities available-for-sale	37,051	20,564
Other investments, at cost
Loans held for sale
Net loans receivable
Accrued interest receivable	3,783
Financial liabilities:
Non-interest bearing demand
Interest bearing demand deposits and money market accounts
Savings
Time deposits
Total deposits
Securities sold under agreements to repurchase
Junior subordinated debt
Accrued interest payable	599
Financial Assets:
Accrued interest receivable		4,167
Financial liabilities:
Time deposits
Accrued interest payable		667
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Cash and short term investments
Investment securities available-for-sale	368,797	339,302
Other investments, at cost
Loans held for sale	23,481	45,020
Net loans receivable
Accrued interest receivable
Financial liabilities:
Non-interest bearing demand	414,707	385,511
Interest bearing demand deposits and money market accounts	566,899	520,205
Savings	130,984	123,032
Time deposits	159,538
Total deposits	1,272,128	1,190,253
Securities sold under agreements to repurchase	60,319	40,914
Junior subordinated debt	13,412	11,748
Accrued interest payable
Financial Assets:
Accrued interest receivable
Financial liabilities:
Time deposits		61,505
Accrued interest payable
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Cash and short term investments
Investment securities available-for-sale
Other investments, at cost	1,699	2,053
Loans held for sale
Net loans receivable	839,395	829,685
Accrued interest receivable
Financial liabilities:
Non-interest bearing demand
Interest bearing demand deposits and money market accounts
Savings
Time deposits
Total deposits
Securities sold under agreements to repurchase
Junior subordinated debt
Accrued interest payable
Financial Assets:
Accrued interest receivable
Financial liabilities:
Time deposits
Accrued interest payable
Reported Value Measurement [Member]
Financial Assets:
Cash and short term investments	112,866	64,992
Investment securities available-for-sale	405,848	359,866
Other investments, at cost	1,699	2,053
Loans held for sale	23,481	45,020
Net loans receivable	858,503	833,768
Accrued interest receivable	3,783
Financial liabilities:
Non-interest bearing demand	414,707	385,511
Interest bearing demand deposits and money market accounts	566,899	520,205
Savings	130,984	123,032
Time deposits	158,850
Total deposits	1,271,440	1,189,413
Securities sold under agreements to repurchase	60,319	40,914
Junior subordinated debt	14,964	14,964
Accrued interest payable	599
Financial Assets:
Accrued interest receivable		4,167
Financial liabilities:
Time deposits		160,665
Accrued interest payable		667
Estimate of Fair Value Measurement [Member]
Financial Assets:
Cash and short term investments	112,866	64,992
Investment securities available-for-sale	405,848	359,866
Other investments, at cost	1,699	2,053
Loans held for sale	23,481	45,020
Net loans receivable	839,395	829,685
Accrued interest receivable	3,783
Financial liabilities:
Non-interest bearing demand	414,707	385,511
Interest bearing demand deposits and money market accounts	566,899	520,205
Savings	130,984	123,032
Time deposits	159,538
Total deposits	1,272,128	1,190,253
Securities sold under agreements to repurchase	60,319	40,914
Junior subordinated debt	13,412	11,748
Accrued interest payable	$ 599
Financial Assets:
Accrued interest receivable		4,167
Financial liabilities:
Time deposits		161,505
Accrued interest payable		$ 667