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ALLOWANCE FOR LOAN LOSSES: Reconciliation of the allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 10,528				$ 9,885	$ 10,528	$ 9,885	$ 10,762
Provision for (recapture of) loan losses	$ 0	$ 0	$ 0	0	$ 0	$ 0	$ 0	0	0	0	(1,150)
Charge-offs									(408)	(458)	(274)
Recoveries									646	1,101	547
Ending balance	10,766				10,528				10,766	10,528	9,885
Commercial and construction | Commercial Business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,418				1,048	1,418	1,048	1,263
Provision for (recapture of) loan losses									10	(121)	(245)
Charge-offs									0	(1)	0
Recoveries									240	492	30
Ending balance	1,668				1,418				1,668	1,418	1,048
Commercial and construction | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				5,084				4,273	5,084	4,273	4,268
Provision for (recapture of) loan losses									(156)	926	5
Charge-offs									(68)	(117)	0
Recoveries									54	2	0
Ending balance	4,914				5,084				4,914	5,084	4,273
Commercial and construction | Land
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				228				325	228	325	539
Provision for (recapture of) loan losses									(301)	(558)	(545)
Charge-offs									0	0	0
Recoveries									293	461	331
Ending balance	220				228				220	228	325
Commercial and construction | Multi-Family
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				297				712	297	712	348
Provision for (recapture of) loan losses									525	(415)	364
Charge-offs									0	0	0
Recoveries									0	0	0
Ending balance	822				297				822	297	712
Commercial and construction | Real Estate Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				714				416	714	416	769
Provision for (recapture of) loan losses									(96)	298	(359)
Charge-offs									0	0	0
Recoveries									0	0	6
Ending balance	618				714				618	714	416
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				2,099				2,403	2,099	2,403	2,548
Provision for (recapture of) loan losses									(9)	(110)	(51)
Charge-offs									(340)	(340)	(274)
Recoveries									59	146	180
Ending balance	1,809				2,099				1,809	2,099	2,403
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 688				$ 708	688	708	1,027
Provision for (recapture of) loan losses									27	(20)	(319)
Charge-offs									0	0	0
Recoveries									0	0	0
Ending balance	$ 715				$ 688				$ 715	$ 688	$ 708

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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-Publisher FASB
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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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