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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, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 10,766				$ 10,528	$ 10,766	$ 10,528	$ 9,885
Provision for (recapture of) loan losses	$ 0	$ 0	$ 250	(200)	$ 0	$ 0	$ 0	0	50	0	0
Charge-offs									(291)	(408)	(458)
Recoveries									932	646	1,101
Ending balance	11,457				10,766				11,457	10,766	10,528
Commercial and construction | Commercial Business
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,668				1,418	1,668	1,418	1,048
Provision for (recapture of) loan losses									139	10	(121)
Charge-offs									0	0	(1)
Recoveries									1	240	492
Ending balance	1,808				1,668				1,808	1,668	1,418
Commercial and construction | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				4,914				5,084	4,914	5,084	4,273
Provision for (recapture of) loan losses									(685)	(156)	926
Charge-offs									0	(68)	(117)
Recoveries									824	54	2
Ending balance	5,053				4,914				5,053	4,914	5,084
Commercial and construction | Land
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				220				228	220	228	325
Provision for (recapture of) loan losses									34	(301)	(558)
Charge-offs									0	0	0
Recoveries									0	293	461
Ending balance	254				220				254	220	228
Commercial and construction | Multi-Family
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				822				297	822	297	712
Provision for (recapture of) loan losses									(94)	525	(415)
Charge-offs									0	0	0
Recoveries									0	0	0
Ending balance	728				822				728	822	297
Commercial and construction | Real Estate Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				618				714	618	714	416
Provision for (recapture of) loan losses									839	(96)	298
Charge-offs									0	0	0
Recoveries									0	0	0
Ending balance	1,457				618				1,457	618	714
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,809				2,099	1,809	2,099	2,403
Provision for (recapture of) loan losses									(178)	(9)	(110)
Charge-offs									(291)	(340)	(340)
Recoveries									107	59	146
Ending balance	1,447				1,809				1,447	1,809	2,099
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 715				$ 688	715	688	708
Provision for (recapture of) loan losses									(5)	27	(20)
Charge-offs									0	0	0
Recoveries									0	0	0
Ending balance	$ 710				$ 715				$ 710	$ 715	$ 688

X

- Definition

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

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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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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.

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