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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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