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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Common Stock
Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance, beginning of period at Sep. 30, 2019 $ 2,032,995 $ (21,945)   $ 135,540 $ 1,672,417 $ 1,335,909 $ (21,945) $ 15,292 $ (1,126,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 104,243         104,243      
Other comprehensive income (loss) (8,831)             (8,831)  
Dividends on common stock (33,374)         (33,374)      
Proceeds from stock-based awards 115     6 109        
Stock-based compensation expense 3,498     196 3,302        
Treasury stock acquired (112,089)               (112,089)
Balance, end of period at Mar. 31, 2020 $ 1,964,612     135,742 1,675,828 1,384,833   6,461 (1,238,252)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends per share (in dollars per share) $ 0.43                
Balance, beginning of period at Dec. 31, 2019 $ 2,031,127     135,720 1,673,666 1,365,397   15,986 (1,159,642)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 36,377         36,377      
Other comprehensive income (loss) (9,525)             (9,525)  
Dividends on common stock (16,941)         (16,941)      
Proceeds from stock-based awards 65     3 62        
Stock-based compensation expense 2,119     19 2,100        
Treasury stock acquired (78,610)               (78,610)
Balance, end of period at Mar. 31, 2020 $ 1,964,612     135,742 1,675,828 1,384,833   6,461 (1,238,252)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends per share (in dollars per share) $ 0.22                
Balance, beginning of period at Sep. 30, 2020 $ 2,014,133   $ 0 135,727 1,678,843 1,420,906   16,953 (1,238,296)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 83,822         83,822      
Other comprehensive income (loss) 64,223             64,223  
Issuance of preferred stock, net 293,325   300,000   (6,675)        
Dividends on common stock (33,913)         (33,913)      
Dividends on preferred stock (2,722)         (2,722)      
Proceeds from stock-based awards 330     20 310        
Stock-based compensation expense 3,527     233 3,294        
Treasury stock acquired (89,772)               (89,772)
Balance, end of period at Mar. 31, 2021 $ 2,332,953   300,000 135,980 1,675,772 1,468,093   81,176 (1,328,068)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends per share (in dollars per share) $ 0.45                
Balance, beginning of period at Dec. 31, 2020 $ 2,061,767   0 135,938 1,680,111 1,443,280   41,435 (1,238,997)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 44,871         44,871      
Other comprehensive income (loss) 39,741             39,741  
Issuance of preferred stock, net 293,325   300,000   (6,675)        
Dividends on common stock (17,336)         (17,336)      
Dividends on preferred stock (2,722)                
Proceeds from stock-based awards 300     18 282        
Stock-based compensation expense 2,078     24 2,054        
Treasury stock acquired (89,071)               (89,071)
Balance, end of period at Mar. 31, 2021 $ 2,332,953   $ 300,000 $ 135,980 $ 1,675,772 $ 1,468,093   $ 81,176 $ (1,328,068)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends per share (in dollars per share) $ 0.23