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ALLOWANCE FOR LOAN LOSSES: (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 19,943 $ 20,436 $ 19,909
Provision for loan losses 10,528 4,700 5,768
Loans charged -off (8,396) (10,673) (8,831)
Recoveries 4,917 5,480 3,590
Ending Balance 47,052 19,943 20,436
Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 8,945 9,848 10,281
Provision for loan losses (1,622) 621 83
Loans charged -off (1,097) (2,616) (1,122)
Recoveries 856 1,092 606
Ending Balance 16,901 8,945 9,848
Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 1,302 1,313 1,455
Provision for loan losses 8,612 (321) 60
Loans charged -off (944) (1,050) (841)
Recoveries 657 1,360 639
Ending Balance 19,142 1,302 1,313
Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 8,304 7,481 6,709
Provision for loan losses 3,538 4,802 5,295
Loans charged -off (6,355) (7,007) (6,868)
Recoveries 3,404 3,028 2,345
Ending Balance 11,009 8,304 7,481
Unallocated      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 1,392 1,794 1,464
Provision for loan losses   (402) 330
Loans charged -off   0 0
Recoveries   0 0
Ending Balance   1,392 $ 1,794
Commercial Real Estate Portfolio Segment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 10,337    
Ending Balance   $ 10,337