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Consolidated Statements of Condition (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Held-to-Maturity: Fair Value $ 3,965,117 $ 3,348,693
Preferred Stock, par value (in dollars per share) $ 0.01  
Preferred Stock, authorized (in shares) 180,000  
Preferred Stock, issued (in shares) 180,000  
Preferred Stock, outstanding (in shares) 180,000  
Common Stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, authorized (in shares) 500,000,000 500,000,000
Common Stock, issued (in shares) 58,557,754 58,285,624
Common Stock, outstanding (in shares) 40,465,482 40,119,312
Treasury Stock (in shares) 18,092,272 18,166,312