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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 18, 2020
Oct. 18, 2019
Sep. 23, 2019
Jan. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 27, 2020
Equity, Class of Treasury Stock [Line Items]                
Treasury stock shares         4,500,000   4,500,000  
Treasury stock, Cost basis         $ 147,400   $ 150,700  
Payments for repurchase of common stock           $ 12,716    
Implementation CECL [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital modified transition amount percentage               25.00%
Implementation CECL [Member] | Regulatory Capital Transition For First Two Years [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital transition percentage               0.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2022 [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital transition percentage               25.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2023 [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital transition percentage               50.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2024 [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital transition percentage               75.00%
Implementation CECL [Member] | Regulatory Capital Three Year Transition, Year 2024 and Thereafter [Member]                
Equity, Class of Treasury Stock [Line Items]                
Regulatory capital transition percentage               100.00%
2018 Stock Buyback Program [Member]                
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized for repurchase     5,500,000          
Stock repurchase expiration date     Dec. 31, 2020          
Accelerated Share Repurchase Agreement | Common Stock [Member]                
Equity, Class of Treasury Stock [Line Items]                
Shares repurchased 1,001,472 3,611,870   315,851 4,900,000      
Shares purchased price per share       $ 40.26 $ 37.65      
Number of shares authorized for repurchase         5,500,000      
Share repurchase, authorized amount   $ 185,000            
Payments for repurchase of common stock   $ 185,000            
Percentage of shares repurchased among authorized   75.00%            
Proceeds from repurchase of common stock $ 12,100              
Restricted Stock [Member]                
Equity, Class of Treasury Stock [Line Items]                
Number of shares nonvested         1,700,000   1,700,000