Loans - Non-performing Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans ninety days or more past due and still accruing	$ 201	$ 2,748
Multi-family Residential Portfolio Segment [Member]
Loans ninety days or more past due and still accruing	201	201
Commercial Real Estate
Loans ninety days or more past due and still accruing		2,547
Performing Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Non-accrual loans	300	300
Performing Financial Instruments [Member] | Taxi Medallion Portfolio Segment [Member]
Non-accrual loans		400
Performing Financial Instruments [Member] | Commercial Business and Other Portfolio Segment [Member]
Non-accrual loans	$ 2,200	$ 2,200