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Loans Receivable, Net - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]                        
Loans pledged as collateral $ 6,707,315               $ 6,707,315      
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments 10.00%               10.00%      
Carrying value at beginning of period $ 8,976       $ 1,618       $ 8,976 $ 1,618 $ 1,545 $ 0
Notes receivable, related parties 77,634       57,825       77,634 57,825    
Origination of notes receivable from related parties                 35,242      
Repayment of notes receivable from related parties                 15,432      
Provision for credit losses (1,535) $ 5,186 $ 16,929 $ 19,185 0 $ 0 $ 0 $ 57 39,765 57 9,953  
PCD loans acquired                 3,401      
ACL on PCD loans acquired                 49      
Discount (premium) on PCD loans                 13      
Nonaccrual interest income reversed                 832      
TDR with pre modification loan balance for which oreo was received 2,278       2,992       2,278 2,992 6,793  
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process 548       1,744       548 1,744    
OREO Secured by Residential Real Estate 273       1,504       273 1,504    
Additional unfunded commitments on TDRs $ 817       $ 3,933       817 3,933    
Charge-offs on TDRs                 453 $ 709 $ 1,685  
State Bank of Arizona                        
Financing Receivable, Allowance for Credit Losses [Line Items]                        
Provision for credit losses                 $ 4,794