Annual report pursuant to Section 13 and 15(d)

PARENT COMPANY FINANCIAL INFORMATION - Statements of Financial Condition (Parentheticals) (Details)

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PARENT COMPANY FINANCIAL INFORMATION - Statements of Financial Condition (Parentheticals) (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]        
Preferred stock, par value (in dollar per share) $ 0.01 $ 0.01    
Preferred stock, shares authorized 3,000,000 3,000,000    
Preferred stock, shares outstanding 0 0    
Preferred stock, shares issued 0 0    
Common stock, par value (in dollar per share) $ 0.01 $ 0.01    
Common stock, shares authorized 90,000,000 90,000,000    
Common stock, shares issued 16,771,544 16,747,571    
Common stock, shares outstanding 16,771,544 16,747,571 16,988,951 16,844,698