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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2020
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Goodwill   $ 901,166 $ 901,166 $ 901,166 $ 808,322 $ 808,322 $ 808,726
Qualitative analysis of market related data, market participant acquisition premium, CARES Act   40.00% 40.00%        
Initial ACL Recorded for PCD Loans   $ 21,242 $ 21,242        
Opus Bank              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Goodwill $ 92,800            
Purchase price (initial fair value) 841,234            
Initial ACL Recorded for PCD Loans $ 21,200            
Min              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Qualitative analysis of market related data, average basis, CARES Act     15 days        
Weighted average useful life     6 years        
Max              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Qualitative analysis of market related data, average basis, CARES Act     30 days        
Weighted average useful life     11 years