Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Narrative) (Details)

v3.20.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Lease liabilities $ 58,901   $ 66,052      
Operating lease, right-of-use asset 48,051   54,941      
Allowance for credit losses on loans 160,540 $ 89,778 42,294   $ 41,045 $ 38,208
Available for sale securities, allowance for credit losses 0          
Impact of adoption of new guidance 616,052   $ 581,395      
Increase in allowance for credit losses on Purchased with Credit Deterioration (PCD) assets 2,386          
Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses   2,400        
Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Lease liabilities       $ 53,200    
Operating lease, right-of-use asset       $ 48,900    
Restatement Adjustment | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans   $ 47,484        
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Impact of adoption of new guidance (39,100)          
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Impact of adoption of new guidance $ (1,100)