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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Accounting Standards Update 2016-01 [Member]
 [1]
Preferred Stock [Member]
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings [Member]
Accounting Standards Update 2016-02 [Member]
Retained Earnings [Member]
Accounting Standards Update 2016-13 [Member]
Retained Earnings [Member]
Accounting Standards Update 2016-01 [Member]
Retained Earnings [Member]
Accounting Standards Update 2018-02 [Member]
Accumulated other comprehensive (loss) income [Member]
Accumulated other comprehensive (loss) income [Member]
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive (loss) income [Member]
Accounting Standards Update 2016-01 [Member]
Accumulated other comprehensive (loss) income [Member]
Accounting Standards Update 2018-02 [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2017     $ 0 $ 204,569 $ 367,717 $ 1,698,613 $ 1,723,632 $ 0 $ 0 $ 30,726 $ (5,707) $ 20,170 $ (4,849) $ (30,726) $ 5,707 $ (578,112)
Dividend reinvestment plan       47 1,379                      
Preferred stock issuance costs         0                      
Preferred stock issuance costs     0                          
Stock purchase and compensation plans       1,081 21,219                      
Net income $ 178,939         178,939                    
Dividends, Preferred Stock, Cash           0                    
Dividends to common stockholders           (44,157)                    
Other comprehensive income (loss) (73,107)                     (73,107)        
Acquisition of treasury stock                               (6,556)
End of year at Dec. 31, 2018 $ 1,791,802 $ (30,726) $ 0 205,697 390,315 1,858,414 1,858,756 342 0 0 0 (77,956) (77,956) 0 0 (584,668)
Dividends declared per preferred share $ 0                              
Dividends declared per common share $ 0.74                              
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2017 0                              
Preferred stock, shares outstanding, ending of period at Dec. 31, 2018 0                              
Preferred Stock, Shares Issued     0                          
Common Stock, shares outstanding, beginning of period at Dec. 31, 2017 58,495,122                              
Dividend reinvestment plan 23,493                              
Stock purchase and compensation plan 540,337                              
Acquisition of treasury stock (110,398)                              
Common Stock, shares outstanding, end of period at Dec. 31, 2018 58,948,554                              
Dividend reinvestment plan       44 1,510                      
Preferred stock issuance costs         0                      
Preferred stock issuance costs     $ 0                          
Stock purchase and compensation plans       1,227 26,696                      
Net income $ 271,623         271,623                    
Dividends, Preferred Stock, Cash           0                    
Dividends to common stockholders           (49,850)                    
Other comprehensive income (loss) 159,706                     159,706        
Acquisition of treasury stock                               (8,164)
End of year at Dec. 31, 2019 $ 2,194,936 0 $ 0 206,968 418,521 2,080,529 $ 2,081,964 $ 0 $ 1,435 $ 0 $ 0 81,750 $ 81,750 $ 0 $ 0 (592,832)
Dividends declared per preferred share $ 0                              
Dividends declared per common share $ 0.83                              
Preferred stock, shares outstanding, ending of period at Dec. 31, 2019 0                              
Preferred Stock, Shares Issued     0                          
Dividend reinvestment plan 22,087                              
Stock purchase and compensation plan 613,678                              
Acquisition of treasury stock (123,166)                              
Common Stock, shares outstanding, end of period at Dec. 31, 2019 59,461,153                              
Dividend reinvestment plan       58 1,645                      
Preferred stock issuance costs         (5,416)                      
Preferred stock issuance costs     $ 200,000                          
Stock purchase and compensation plans       1,040 24,235                      
Net income $ 246,355         246,355                    
Dividends, Preferred Stock, Cash           0                    
Dividends to common stockholders           (56,782)                    
Other comprehensive income (loss) 138,436                     138,436        
Acquisition of treasury stock                               (7,053)
End of year at Dec. 31, 2020 $ 2,738,889 $ 0 $ 200,000 $ 208,066 $ 438,985 $ 2,271,537           $ 220,186       $ (599,885)
Dividends declared per preferred share $ 0                              
Dividends declared per common share $ 0.94                              
Preferred stock, shares outstanding, ending of period at Dec. 31, 2020 8,000                              
Preferred Stock, Shares Issued     8,000                          
Dividend reinvestment plan 28,890                              
Stock purchase and compensation plan 519,863                              
Acquisition of treasury stock (104,103)                              
Common Stock, shares outstanding, end of period at Dec. 31, 2020 59,905,803                              
[1] Upon adoption of ASU 2016-01, we recognized a $30.7 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2018. Additionally, upon adoption of ASU 2018-02, we recognized a one-time reclassification from AOCI to retained earnings for $17.9 million representing the stranded tax assets related to our investment portfolio that were created in AOCI from the enactment of the Tax Cuts and Jobs Act of 2017.