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Office Properties and Equipment, Net Office Properties and Equipment, Net Text Tag (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation   $ 793 $ 897
Gain on sale of building $ 9,600 616 9,615
Crown Heights [Domain]      
Property, Plant and Equipment [Line Items]      
Deferred Gain on Sale of Property 537 468 537
Main Office [Domain]      
Property, Plant and Equipment [Line Items]      
Deferred Gain on Sale of Property $ 5,400 $ 4,900 $ 5,400