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Significant Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 01, 2020
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]              
Cumulative decrease from change in accounting principle - CECL   $ (1,051,491) $ (1,052,795) $ (1,007,847) $ (1,019,150) $ (991,405) $ (956,816)
Deferred taxes     $ 11,740        
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member        
Available-for-sale debt securities, accrued interest   $ 4,200          
Accounting Standards Update 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Initial allowance on loans purchased with credit deterioration $ 200            
Financing receivable, purchased with credit deterioration, discount 300            
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative decrease from change in accounting principle - CECL   $ (385,750) $ (381,519) $ (338,665) $ (357,608) $ (334,157) $ (316,651)
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative decrease from change in accounting principle - CECL     61,475        
Deferred taxes (21,510)            
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative decrease from change in accounting principle - CECL $ 61,500   $ 61,475