Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Allowance for Credit Losses: Unfunded Credit Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Change in allowance for credit loss	$ 124,000
Allowance for credit loss, beginning balance	421,000	$ 392,000	$ 422,000	$ 448,000
Provision for (reduction in) credit losses	146,000	16,000	154,000	50,000
Foreign Currency Translation Adjustments	(2,000)	0	(3,000)	0
Allowance for credit loss, ending balance	545,000	396,000	545,000	396,000
Unfunded Credit Commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Change in allowance for credit loss	49,000
Allowance for credit loss, beginning balance	175,000	105,000	171,000	121,000
Provision for (reduction in) credit losses	50,000	15,000	54,000	(1,000)
Foreign Currency Translation Adjustments	(1,000)	0	(1,000)	0
Allowance for credit loss, ending balance	$ 224,000	$ 120,000	$ 224,000	$ 120,000