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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
STOCKHOLDERS’ EQUITY    
Fair Value $ 56,391 $ 93,745
Preferred stock, shares authorized (in shares) 3,000,000 3,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock (in shares) 16,531 118,274
Non Bank Qualified Obligations U S States And Political Subdivisions [Member]    
STOCKHOLDERS’ EQUITY    
Fair Value $ 52,576 $ 88,194
Common Class A    
STOCKHOLDERS’ EQUITY    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 90,000,000 90,000,000
Common stock, shares issued (in shares) 31,686,483 34,479,164
Common stock, shares outstanding (in shares) 31,669,952 34,360,890
Nonvoting Common Stock    
STOCKHOLDERS’ EQUITY    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 3,000,000 3,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0