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Loans and Allowance for Loan Losses - Age Analysis of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans, Past Due	$ 43,232	$ 67,381
Loans, Current	6,702,084	6,637,293
Loans	6,745,316	6,704,674
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	21,412	36,947
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	2,705	11,519
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	19,115	18,915
Multi-family Residential Portfolio Segment [Member]
Loans, Past Due	16,523	13,545
Loans, Current	2,510,593	2,522,432
Loans	2,527,116	2,535,977
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	11,887	7,582
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	0	3,186
Multi-family Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	4,636	2,777
Commercial Real Estate
Loans, Past Due	1,254	27,339
Loans, Current	1,722,223	1,731,045
Loans	1,723,477	1,758,384
Commercial Real Estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	419	17,903
Commercial Real Estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	800	5,123
Commercial Real Estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	35	4,313
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans, Past Due	8,449	8,238
Loans, Current	590,570	598,647
Loans	599,019	606,885
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	4,759	5,673
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	1,210	1,132
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	2,480	1,433
One-To-Four Family - Residential Portfolio Segment [Member]
Loans, Past Due	8,265	9,205
Loans, Current	238,740	243,486
Loans	247,005	252,691
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	1,101	3,087
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	375	805
One-To-Four Family - Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	6,789	5,313
Construction Portfolio Segment [Member]
Loans, Past Due	2,381	750
Loans, Current	59,052	82,411
Loans	61,433	83,161
Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	0	750
Construction Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	0	0
Construction Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	2,381	0
Small Business Administration Portfolio Segment [Member]
Loans, Past Due	1,810	2,991
Loans, Current	259,829	162,579
Loans	261,639	165,570
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	642	1,823
Small Business Administration Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	0	0
Small Business Administration Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	1,168	1,168
Taxi Medallion Portfolio Segment [Member]
Loans, Past Due	0	2,318
Loans, Current	0	279
Loans	0	2,597
Taxi Medallion Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	0	0
Taxi Medallion Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	0	0
Taxi Medallion Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	0	2,318
Commercial Business and Other Portfolio Segment [Member]
Loans, Past Due	4,550	2,995
Loans, Current	1,321,077	1,296,414
Loans	1,325,627	1,299,409
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Past Due	2,604	129
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Past Due	320	1,273
Commercial Business and Other Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Past Due	$ 1,626	$ 1,593

X

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