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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]              
Qualitative adjustments included in the ACL   $ 15,000   $ 15,000      
Increase (decrease) in ACL during period   166,800   246,600      
Provision for Credit Losses   150,257 $ 742 175,639 $ 2,754    
Net charge-offs   4,700   6,000      
Initial ACL Recorded for PCD Loans   21,242   21,242      
Loans held for investment   15,082,884   15,082,884     $ 8,722,311
Allowance for credit losses on off-balance sheet credit exposures   22,000   22,000   $ 3,279 $ 3,300
Change in allowance for off-balance sheet commitments   10,400   10,500      
Financial Asset Acquired with Credit Deterioration              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Change in allowance for off-balance sheet commitments       1,900      
Opus Bank              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Provision for Credit Losses $ 75,900 75,900   $ 75,900      
Initial ACL Recorded for PCD Loans $ 21,200            
Change in allowance for off-balance sheet commitments   $ 8,600          
Impact of CECL Adoption              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Loans held for investment           55,700  
Allowance for credit losses on off-balance sheet credit exposures           $ 8,285