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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]                
Qualitative adjustments included in the ACL   $ 8,000   $ 8,000        
Increase (decrease) in ACL during period   34,200 $ (166,800) 35,200 $ (246,600)      
Provision for Credit Losses   (33,131) 150,257 (32,816) 175,639      
Net charge-offs   (1,100) 4,700 (2,400) 6,000      
Initial ACL Recorded for PCD Loans     21,242   21,242      
Loans held for investment   13,594,598   13,594,598     $ 13,236,433  
Off-balance sheet commitments   27,400 22,000 27,400 22,000 $ 32,800 $ 31,100  
Provision for credit losses for off-balance sheet commitments   $ 5,400 10,400 $ 3,700 10,500      
Financial Asset Acquired with Credit Deterioration                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for credit losses 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              
Provision for credit losses for off-balance sheet commitments     $ 8,600   $ 8,600      
Cumulative Effect of the Change in Accounting Principle                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Loans held for investment               $ 55,700