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Preferred Stock Text Block List (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]      
Preferred Stock Shares Issued 8,000,000.0    
Preferred Stock, Liquidation Preference, Value $ 25    
Preferred stock issued, net of issuance costs $ 195,063 $ 0 $ 0
Rating Agency Event [Member]      
Class of Stock [Line Items]      
Depositary Share Price $ 25.50    
Preferred Stock, Redemption Price Per Share 25,500    
Regulatory Capital Event [Member]      
Class of Stock [Line Items]      
Depositary Share Price 25.00    
Preferred Stock, Redemption Price Per Share $ 25,000    
Proceeds from preferred stock offering; less issuance costs [Member]      
Class of Stock [Line Items]      
Preferred stock issued, net of issuance costs $ 194,600    
Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Shares Authorized 5,000,000 5,000,000  
Preferred Stock, Shares Issued   0  
Series A [Member]      
Class of Stock [Line Items]      
Preferred Stock, Shares Authorized 300,000 300,000  
Series B [Member]      
Class of Stock [Line Items]      
Preferred Stock, Shares Issued 8,000    
Depositary Share Price $ 25.00    
Preferred Stock, Dividend Rate, Percentage 4.60%