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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balance $ 6,841,644 $ 6,711,694
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member  
Cumulative Effect, Period of Adoption, Adjustment    
Balance [1]   $ (10,468)
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Common Stock (Par Value: $0.01)    
Dividends paid on common stock, per share $ 0.17 $ 0.17
Balance $ 4,904 $ 4,904
Preferred Stock (Par Value: $0.01)    
Dividends paid on preferred stock, per share $ 15.94 $ 15.94
Balance $ 502,840 $ 502,840
Retained Earnings    
Balance $ 494,229 342,023
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment    
Balance [1]   $ (10,468)
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
[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.