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ALLOWANCE FOR LOAN LOSSES: (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Ending Balance Attributable to Loans        
Individually evaluated for impairment   $ 48    
Collectively evaluated for impairment   19,895    
BALANCE AT END OF YEAR $ 47,052 19,943 $ 20,436 $ 19,909
Financing Receivable [Abstract]        
Individually evaluated for impairment   7,113    
Collectively evaluated for impairment   2,651,893    
Acquired with deteriorated credit quality 2,563,242 2,636,447    
BALANCE AT END OF YEAR 2,618,553 2,666,442    
Commercial        
Ending Balance Attributable to Loans        
Individually evaluated for impairment   48    
Collectively evaluated for impairment   8,897    
BALANCE AT END OF YEAR 16,901 8,945 9,848 10,281
Financing Receivable [Abstract]        
Individually evaluated for impairment   3,161    
Collectively evaluated for impairment   1,584,169    
BALANCE AT END OF YEAR   1,594,766    
Residential        
Ending Balance Attributable to Loans        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   1,302    
BALANCE AT END OF YEAR 19,142 1,302 1,313 1,455
Financing Receivable [Abstract]        
Individually evaluated for impairment   3,952    
Collectively evaluated for impairment   680,069    
BALANCE AT END OF YEAR   684,021    
Consumer        
Ending Balance Attributable to Loans        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   8,304    
BALANCE AT END OF YEAR $ 11,009 8,304 7,481 6,709
Financing Receivable [Abstract]        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   387,655    
BALANCE AT END OF YEAR   387,655    
Unallocated        
Ending Balance Attributable to Loans        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   1,392    
BALANCE AT END OF YEAR   1,392 $ 1,794 $ 1,464
Acquired with deteriorated credit quality        
Ending Balance Attributable to Loans        
Acquired with deteriorated credit quality   0    
Financing Receivable [Abstract]        
Acquired with deteriorated credit quality   7,436    
Acquired with deteriorated credit quality | Commercial        
Ending Balance Attributable to Loans        
Acquired with deteriorated credit quality   0    
Financing Receivable [Abstract]        
Acquired with deteriorated credit quality   7,436    
Acquired with deteriorated credit quality | Residential        
Ending Balance Attributable to Loans        
Acquired with deteriorated credit quality   0    
Financing Receivable [Abstract]        
Acquired with deteriorated credit quality   0    
Acquired with deteriorated credit quality | Consumer        
Ending Balance Attributable to Loans        
Acquired with deteriorated credit quality   0    
Financing Receivable [Abstract]        
Acquired with deteriorated credit quality   0    
Acquired with deteriorated credit quality | Unallocated        
Ending Balance Attributable to Loans        
Acquired with deteriorated credit quality   $ 0