Loans and Allowance for Loan Losses - Loans Designated as Criticized or Classified (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Loans designated as criticized or classified	$ 38,046
Special Mention [Member]
Loans designated as criticized or classified	13,747
Substandard [Member]
Loans designated as criticized or classified	24,033
Doubtful [Member]
Loans designated as criticized or classified	266
Loss [Member]
Loans designated as criticized or classified	0
Multi-family Residential Portfolio Segment [Member]
Loans designated as criticized or classified	4,306
Multi-family Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,563
Multi-family Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	2,743
Multi-family Residential Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
Multi-family Residential Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
Commercial Real Estate Portfolio Segment [Member]
Loans designated as criticized or classified	5,892
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	5,525
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	367
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
Commercial Real Estate Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans designated as criticized or classified	2,038
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,585
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	453
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
One-To-Four Family - Residential Portfolio Segment [Member]
Loans designated as criticized or classified	6,882
One-To-Four Family - Residential Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	1,095
One-To-Four Family - Residential Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	5,787
One-To-Four Family - Residential Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
One-To-Four Family - Residential Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
Construction Portfolio Segment [Member]
Loans designated as criticized or classified	0
Construction Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	0
Construction Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	0
Construction Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
Construction Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
Small Business Administration Portfolio Segment [Member]
Loans designated as criticized or classified	140
Small Business Administration Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	55
Small Business Administration Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	85
Small Business Administration Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
Small Business Administration Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
Taxi Medallion Portfolio Segment [Member]
Loans designated as criticized or classified	3,309
Taxi Medallion Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	0
Taxi Medallion Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	3,309
Taxi Medallion Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	0
Taxi Medallion Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	0
Commercial Business and Other Portfolio Segment [Member]
Loans designated as criticized or classified	15,479
Commercial Business and Other Portfolio Segment [Member] | Special Mention [Member]
Loans designated as criticized or classified	3,924
Commercial Business and Other Portfolio Segment [Member] | Substandard [Member]
Loans designated as criticized or classified	11,289
Commercial Business and Other Portfolio Segment [Member] | Doubtful [Member]
Loans designated as criticized or classified	266
Commercial Business and Other Portfolio Segment [Member] | Loss [Member]
Loans designated as criticized or classified	$ 0