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
3 Months Ended
Mar. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Accounting Policies [Line Items]    
Number of bank branches | item 129  
Number of ATM's | item 150  
Goodwill $ 935,560 $ 935,560
Accrued interest receivable 57,400 56,700
Available-for-sale Securities    
Accounting Policies [Line Items]    
Accrued interest receivable 11,700 11,900
Held-to-maturity Securities    
Accounting Policies [Line Items]    
Accrued interest receivable $ 5,100 $ 6,800