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Basis of Presentation - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member        
Adoption of stockholders' equity $ (1,461,714) $ (1,153,119) $ (1,476,434) $ (1,144,528) $ (1,137,295) $ (1,039,358)
Financing receivable, allowance for credit loss, period increase (decrease) (475)          
Debt securities, held-to-maturity, allowance for credit loss, period increase (decrease) 1,300          
Decrease in off-balance sheet credit exposure 788          
Purchased credit impaired (“PCI”) loans   13,300        
Financing receivable, allowance for credit losses, effect of change in method $ 3,200          
Cumulative Effect, Period Of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Adoption of stockholders' equity   $ 4