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Stockholders' Equity Matters - Dividends Declared (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 05, 2020
$ / shares
Jun. 15, 2020
USD ($)
May 05, 2020
$ / shares
Mar. 16, 2020
USD ($)
Feb. 13, 2020
$ / shares
Dec. 16, 2019
USD ($)
Oct. 31, 2019
$ / shares
Sep. 16, 2019
USD ($)
Jul. 26, 2019
$ / shares
Jun. 17, 2019
USD ($)
May 22, 2019
$ / shares
Mar. 15, 2019
USD ($)
Feb. 07, 2019
$ / shares
Oct. 31, 2017
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Subsidiary or Equity Method Investee [Line Items]                                    
Dividend per share (in dollars per share) | $ / shares     $ 0.6185   $ 0.6185   $ 0.6185   $ 0.6110   $ 0.6110   $ 0.6110          
Total Amount   $ 178,212   $ 178,047   $ 177,687   $ 175,434   $ 175,389   $ 175,242     $ 179,342 $ 176,642 $ 358,854 $ 353,102
At The Market (ATM) Equity Program                                    
Subsidiary or Equity Method Investee [Line Items]                                    
Number of banks                           10        
Aggregate sales price of common stock                           $ 500,000        
Shares of common stock sold (in shares) | shares                                 0  
Remaining aggregate sale price of shares of common stock                             $ 431,200   $ 431,200  
Subsequent Event                                    
Subsidiary or Equity Method Investee [Line Items]                                    
Dividend per share (in dollars per share) | $ / shares $ 0.6185