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Allowance for Credit Losses - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 01, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                
Qualitative adjustments included in the ACL   $ 15,000,000.0     $ 15,000,000.0      
Increase (decrease) in ACL during period   232,000     246,800,000      
Provision for Credit Losses   4,702,000   $ 1,365,000 180,341,000 $ 4,119,000    
Net charge-offs   4,500,000     10,500,000      
Loans held for investment   13,450,840,000     13,450,840,000     $ 8,722,311,000
Initial ACL Recorded for PCD Loans         21,242,000      
Allowance for credit losses on off-balance sheet credit exposures   21,500,000     21,500,000   $ 3,279,000 $ 3,300,000
Provision for credit losses for off-balance sheet commitments   $ (492,000)     10,000,000.0      
Financial Asset Acquired with Credit Deterioration                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for credit losses for off-balance sheet commitments         1,400,000      
Opus Bank                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Credit Losses $ 75,900,000       $ 75,900,000      
Initial ACL Recorded for PCD Loans $ 21,200,000              
Provision for credit losses for off-balance sheet commitments     $ 8,600,000          
Impact of CECL Adoption                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Loans held for investment             55,700,000  
Allowance for credit losses on off-balance sheet credit exposures             8,285,000  
Impact of CECL Adoption | Financial Asset Acquired with Credit Deterioration                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Loans held for investment             $ 0