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Acquisitions - Narrative (Details)
$ / shares in Units, client_account in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 01, 2020
USD ($)
office
$ / shares
shares
May 29, 2020
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2020
USD ($)
client_account
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                      
Total assets     $ 20,529,486     $ 20,529,486   $ 20,529,486 $ 19,736,544    
Total gross loans     13,594,598     13,594,598   13,594,598 13,236,433    
Total deposits     17,015,097     17,015,097   17,015,097 16,214,177    
Goodwill     901,312   $ 901,166 901,312 $ 901,166 901,312 $ 898,569   $ 808,322
Purchase accounting adjustments           2,743 0        
ACL expense (reversal)     (33,131)   150,257 (32,816) 175,639        
Initial ACL Recorded for PCD Loans         21,242   21,242        
Merger-related expense     $ 0 $ 5 39,346 5 41,070        
PENSCO                      
Business Acquisition [Line Items]                      
Custodial assets                   $ 14,480,000  
Number of client accounts | client_account                   44  
Opus Bank                      
Business Acquisition [Line Items]                      
Equity issued, ratio 0.900                    
Stock transaction value (in dollars per share) | $ / shares $ 19.31                    
Closing price of Corporation's common stock (in dollars per share) | $ / shares   $ 21.62                  
Total merger consideration $ 749,605 $ 749,605                  
Intangible assets 19,267                    
Goodwill 92,990                    
Purchase accounting adjustments           2,700   $ 146      
Fair value of non-PCD loans 4,940,000                    
Fair value of PCD loans 841,200                    
Contractual balance of non-PCD loans 5,050,000                    
Contractual balance of PCD loans 896,500                    
ACL expense (reversal) 75,900       75,900   $ 75,900        
Initial ACL Recorded for PCD Loans 21,200                    
Merger-related expense         $ 39,300 $ 5          
Opus Bank | Core Deposits                      
Business Acquisition [Line Items]                      
Intangible assets 16,100                    
Opus Bank | Customer Relationships                      
Business Acquisition [Line Items]                      
Intangible assets $ 3,200                    
Opus Bank | Common Stock                      
Business Acquisition [Line Items]                      
Common stock issued as consideration (in shares) | shares 34,407,403                    
Common stock issued issued for tax withholding (in shares) | shares 165,136                    
Value of equity interests issued and issuable   747,458                  
Opus Bank | Equity warrants                      
Business Acquisition [Line Items]                      
Common stock issued as consideration (in shares) | shares 406,778                    
Value of equity interests issued and issuable $ 1,800                    
Opus Bank | Equity Option                      
Business Acquisition [Line Items]                      
Common stock issued as consideration (in shares) | shares 9,538                    
Value of equity interests issued and issuable $ 46                    
Opus Bank | Restricted Stock Awards                      
Business Acquisition [Line Items]                      
Value of equity interests issued and issuable 328 $ 328                  
Opus Bank | Opus Bank                      
Business Acquisition [Line Items]                      
Total assets 8,320,000                    
Total gross loans 5,940,000                    
Total deposits $ 6,910,000                    
Number of banking offices | office 46