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ALLOWANCE FOR LOAN LOSSES: ALLOWANCE FOR LOAN LOSSES: (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	$ 7,034	$ 8,565	$ 9,860
Added	1,279	613	492
Charged Off	(153)	(430)	(391)
Payments	(3,354)	(1,714)	(1,396)
December 31,	4,806	7,034	8,565
Commercial
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	2,709	3,386	3,584
Added	0	0	0
Charged Off	0	0	0
Payments	(2,564)	(677)	(198)
December 31,	145	2,709	3,386
Residential
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	3,611	4,447	5,593
Added	984	227	123
Charged Off	(16)	(289)	(321)
Payments	(536)	(774)	(948)
December 31,	4,043	3,611	4,447
Consumer
Financing Receivable, Impaired, Troubled Debt Restructuring [Roll Forward]
January 1,	714	732	683
Added	295	386	369
Charged Off	(137)	(141)	(70)
Payments	(254)	(263)	(250)
December 31,	$ 618	$ 714	$ 732

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Financing Receivable, Impaired, Troubled Debt Restructuring, Additions During Period

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- Definition

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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