Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Accounting Policies [Line Items]    
Number of bank branches | item 130  
Number of ATM's | item 150  
Goodwill $ 935,560 $ 935,560
Accrued interest receivable 51,100 56,700
Available-for-sale Securities    
Accounting Policies [Line Items]    
Accrued interest receivable 12,900 11,900
Held-to-maturity Securities    
Accounting Policies [Line Items]    
Accrued interest receivable $ 6,700 $ 6,800