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Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred stock, no par value (in usd per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 2,500,000 2,500,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, no par value (in usd per share) $ 0 $ 0
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 36,882,771 36,874,055
Common stock, shares outstanding (in shares) 36,882,771 36,874,055