Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Nonaccrual Loans with No Allowance for Credit Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	$ 132,000	$ 84,000
Nonaccrual Loans with no ACL	11,000	9,000
Investor dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	72,000	17,000
Nonaccrual Loans with no ACL	3,000	0
Investor dependent | Early stage
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	17,000	11,000
Nonaccrual Loans with no ACL	0	0
Investor dependent | Growth stage
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	55,000	6,000
Nonaccrual Loans with no ACL	3,000	0
Cash flow dependent and innovation C&I | Cash flow dependent - SLBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	0	34,000
Nonaccrual Loans with no ACL	0	0
Cash flow dependent and innovation C&I | Innovation C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	28,000	1,000
Nonaccrual Loans with no ACL	0	1,000
Private Bank
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	25,000	21,000
Nonaccrual Loans with no ACL	7,000	8,000
CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	5,000	5,000
Nonaccrual Loans with no ACL	0	0
Other C&I
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	2,000	4,000
Nonaccrual Loans with no ACL	1,000	0
PPP
Financing Receivable, Allowance for Credit Loss [Line Items]
Nonaccrual Loans	0	2,000
Nonaccrual Loans with no ACL	$ 0	$ 0