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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance $ 6,841,644 $ 6,711,694 $ 6,711,694 $ 6,655,235 $ 6,795,376
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13   Accounting Standards Update 2016-13    
Cumulative Effect, Period of Adoption, Adjustment          
Balance [1],[2]   $ (10,468) $ (10,468)    
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13 Accounting Standards Update 2016-13    
Common Stock (Par Value: $0.01)          
Dividends paid on common stock, per share $ 0.17 $ 0.17 $ 0.68 $ 0.68 $ 0.68
Balance $ 4,904 $ 4,904 $ 4,904 $ 4,904 $ 4,891
Preferred Stock (Par Value: $0.01)          
Dividends paid on preferred stock, per share $ 15.94 $ 15.94 $ 63.76 $ 63.76 $ 63.76
Balance $ 502,840 $ 502,840 $ 502,840 $ 502,840 $ 502,840
Retained Earnings          
Balance $ 494,229 342,023 342,023 $ 297,202 $ 237,868
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment          
Balance [1],[2]   $ (10,468) $ (10,468)    
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13      
[1] Amount represents a $10.5 million cumulative adjustment, net of tax, to retained earnings as of January 1, 2020, as a result of the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which became effective January 1, 2020.
[2] Amount represents a $10.5 million cumulative adjustment, net of tax, to retained earnings as of January 1, 2020, as a result of the adoption of ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which became effective January 1, 2020.