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Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost $ 1,402,144,000 $ 1,460,033,000
Total investment securities $ 664,810,000 $ 673,434,000
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) 35,047,800 35,106,697
Common stock, shares outstanding (in shares) 35,047,800 35,106,697
Fair Value, Recurring [Member]    
Total investment securities   $ 673,434,000
Level 2 | Fair Value, Recurring [Member]    
Total investment securities $ 664,810,000