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Loans and Allowance for Loan Losses - Non-Accrual at Amortized Cost (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total Non-accrual amortized cost	$ 20,823	$ 20,947	$ 28,026
Non-Accrual with no related Allowance	16,806	16,880
Interest income recognized	48	58
Loans ninety days or more past due and still accruing:	2,582	2,748
Multi-family Residential Portfolio Segment [Member]
Total Non-accrual amortized cost	4,435	2,576	2,723
Non-Accrual with no related Allowance	4,435	2,576
Loans ninety days or more past due and still accruing:	201	201
Commercial Real Estate
Total Non-accrual amortized cost	35	1,766	2,714
Non-Accrual with no related Allowance	35	1,766
Loans ninety days or more past due and still accruing:		2,547
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Total Non-accrual amortized cost	2,753	1,706	1,704
Non-Accrual with no related Allowance	2,753	1,706
One-To-Four Family - Residential Portfolio Segment [Member]
Total Non-accrual amortized cost	6,789	5,313	9,992
Non-Accrual with no related Allowance	6,789	5,313
Construction Portfolio Segment [Member]
Loans ninety days or more past due and still accruing:	2,381
Small Business Administration Portfolio Segment [Member]
Total Non-accrual amortized cost	1,168	1,168	1,169
Non-Accrual with no related Allowance	1,168	1,168
Taxi Medallion Portfolio Segment [Member]
Total Non-accrual amortized cost		2,758	2,318
Non-Accrual with no related Allowance		2,758
Commercial Business and Other Portfolio Segment [Member]
Total Non-accrual amortized cost	5,643	5,660	$ 7,406
Non-Accrual with no related Allowance	1,626	1,593
Interest income recognized	$ 48	$ 58

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