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Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Amortized cost $ 802,391,000 $ 939,160,000
Preferred Stock, No Par Value $ 0 $ 0
Preferred stock, shares authorized (in shares) 2,500,000 2,500,000
Preferred Stock, Value, Outstanding $ 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) 35,910,300 36,618,729
Common stock, shares outstanding (in shares) 35,910,300 36,618,729