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Basis of Presentation (Details)
$ in Thousands
Jun. 01, 2020
USD ($)
office
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Total assets   $ 19,844,240 $ 11,776,012
Loans held for investment   13,450,840 8,722,311
Total deposits   $ 16,330,807 $ 8,898,509
Opus Bank      
Business Acquisition [Line Items]      
Total merger consideration $ 749,605    
Opus Bank | Opus Bank      
Business Acquisition [Line Items]      
Total assets 8,320,000    
Loans held for investment 5,940,000    
Total deposits $ 6,910,000    
Number of banking offices | office 46