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Earnings Per Common Share and Stockholders' Equity (Stockholders' Equity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 10, 2020
Nov. 21, 2019
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Class of Stock [Line Items]              
Dividends paid on preferred stock     $ 10,919 $ 10,919 [1] $ 21,838 $ 21,838 [1]  
Depositary Shares, each representing a 1/1,000th interest in a share of 6.625% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series B              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares) 12,000   12,000   12,000   12,000
Preferred stock, dividend rate, percentage 6.625%            
Preferred stock, par value per share (dollars per share) $ 1.00   $ 1   $ 1   $ 1
Preferred stock, liquidation preference, per share (dollars per share) $ 25,000            
Proceeds from issuance of preferred stock, net $ 290,300            
Dividends paid on preferred stock     $ 4,900 4,900 $ 9,900 9,900  
Depositary Shares, each representing a 1/1,000th interest in a share of 5.95% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series A              
Class of Stock [Line Items]              
Preferred stock, shares issued (in shares)   16,000 16,000   16,000   16,000
Preferred stock, dividend rate, percentage   5.95%          
Preferred stock, par value per share (dollars per share)   $ 1.00 $ 1   $ 1   $ 1
Preferred stock, liquidation preference, per share (dollars per share)   $ 25,000          
Proceeds from issuance of preferred stock, net   $ 388,900          
Dividends paid on preferred stock     $ 6,000 $ 6,000 $ 11,900 $ 11,900  
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.