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Regulatory Capital and Dividends - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Jan. 27, 2021
Jan. 01, 2021
Dec. 31, 2020
Sep. 03, 2019
Restructuring Cost and Reserve [Line Items]            
Dividends available   $ 194,434,000        
Dividend reinvestment and stock purchase plan, stockholder's maximum amount of cash payments per quarter in purchase of common stock   5,000        
Retained earnings   $ (864,839,000)     $ (788,578,000)  
Stock Repurchase Program            
Restructuring Cost and Reserve [Line Items]            
Stock authorized to be repurchased (in shares)     3,333,000     3,000,000
Stock authorized to be repurchased (in shares) $ 75,000,000   $ 100,000,000     $ 75,000,000
Percent of outstanding shares     6.00%     5.00%
Repurchases of common stock (in shares) 1,634,437 646,102        
Stock repurchased during period $ 55,900,000 $ 25,400,000        
Average price (in usd per share) $ 34.21 $ 39.38        
Impact of adopting ASC 326            
Restructuring Cost and Reserve [Line Items]            
Retained earnings       $ 68,040,000    
PPP            
Restructuring Cost and Reserve [Line Items]            
PPP loans at a zero risk weight   $ 106,600,000     $ 667,100,000