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Shareholders' Equity - Narrative (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 15, 2021
Sep. 15, 2021
USD ($)
$ / shares
Jun. 15, 2021
Dec. 31, 2023
USD ($)
series
$ / shares
shares
Dec. 31, 2022
USD ($)
series
shares
Dec. 31, 2021
USD ($)
shares
Aug. 25, 2021
shares
Capital Unit [Line Items]              
Number of shares authorized to be repurchased             3,235,326
Number of shares authorized to be repurchased, percent of outstanding shares             10.00%
Shares repurchased (shares)       1,379,883 830,145 527,789  
Shares repurchased, value | $       $ 39,800 $ 33,200 $ 27,700  
Number of preferred stock series outstanding | series       2 2    
Stock redeemed during period, value | $           79,677  
Loss on redemption of preferred stock | $       $ 0 $ 0 $ 2,820  
Preferred stock, shares outstanding (in shares)       5,700,000 5,700,000    
Preferred stock, shares issued (in shares)       5,700,000 5,700,000    
Series C and D Preferred Stock              
Capital Unit [Line Items]              
Stock redeemed during period, value | $   $ 82,500          
Preferred stock, redemption price (usd per share) | $ / shares   $ 25.00          
Preferred stock, shares outstanding (in shares)       0 0    
Preferred stock, shares issued (in shares)       0 0 0  
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share              
Capital Unit [Line Items]              
Preferred stock, shares issued (in shares)       2,300,000 2,300,000    
Interest rate, stated percentage     6.45%        
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share | LIBOR              
Capital Unit [Line Items]              
Spread on variable interest rate     5.14%        
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share              
Capital Unit [Line Items]              
Preferred stock, shares issued (in shares)       3,400,000 3,400,000    
Interest rate, stated percentage 6.00%            
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share | LIBOR              
Capital Unit [Line Items]              
Spread on variable interest rate 4.762%            
Series E and F Preferred Stock              
Capital Unit [Line Items]              
Preferred stock, redemption price (usd per share) | $ / shares       $ 25.00