Loans and Allowance for Loan Losses - Amortized Cost of Collateral (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	$ 14,845
Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	6,295
Multi-family Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	3,728
Commercial Real Estate Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	2,700
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	2,548
One-To-Four Family - Residential Portfolio Segment [Member] | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	5,869
Small Business Administration Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	1,347
Commercial Business and Other Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	1,678
Taxi Medallion Portfolio Segment [Member] | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral Type	$ 3,270