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ALLOWANCE FOR LOAN LOSSES: (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Ending Balance Attributable to Loans
Individually evaluated for impairment	$ 737	$ 625
Collectively evaluated for impairment	19,699	19,284
BALANCE AT END OF YEAR	20,436	19,909	$ 18,773	$ 19,946
Loans
Individually evaluated for impairment	10,516	10,082
Collectively evaluated for impairment	1,949,197	1,901,080
BALANCE AT END OF YEAR	1,961,208	1,913,022
Commercial
Ending Balance Attributable to Loans
Individually evaluated for impairment	737	619
Collectively evaluated for impairment	9,111	9,662
BALANCE AT END OF YEAR	9,848	10,281	9,731	11,482
Loans
Individually evaluated for impairment	6,101	9,619
Collectively evaluated for impairment	1,166,227	1,134,701
BALANCE AT END OF YEAR	1,173,823	1,146,180
Residential
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	6
Collectively evaluated for impairment	1,313	1,449
BALANCE AT END OF YEAR	1,313	1,455	1,553	1,834
Loans
Individually evaluated for impairment	4,415	463
Collectively evaluated for impairment	440,497	436,944
BALANCE AT END OF YEAR	444,912	437,407
Consumer
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	7,481	6,709
BALANCE AT END OF YEAR	7,481	6,709	5,767	4,945
Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	342,473	329,435
BALANCE AT END OF YEAR	342,473	329,435
Unallocated
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,794	1,464
BALANCE AT END OF YEAR	1,794	1,464	$ 1,722	$ 1,685
Acquired with deteriorated credit quality
Ending Balance Attributable to Loans
Acquired with deteriorated credit quality	0	0
Loans
Acquired with deteriorated credit quality	1,495	1,860
Acquired with deteriorated credit quality | Commercial
Ending Balance Attributable to Loans
Acquired with deteriorated credit quality	0	0
Loans
Acquired with deteriorated credit quality	1,495	1,860
Acquired with deteriorated credit quality | Residential
Ending Balance Attributable to Loans
Acquired with deteriorated credit quality	0	0
Loans
Acquired with deteriorated credit quality	0	0
Acquired with deteriorated credit quality | Consumer
Ending Balance Attributable to Loans
Acquired with deteriorated credit quality	0	0
Loans
Acquired with deteriorated credit quality	0	0
Acquired with deteriorated credit quality | Unallocated
Ending Balance Attributable to Loans
Acquired with deteriorated credit quality	$ 0	$ 0

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