Loans (Narrative) (Details)		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) item loan	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Sep. 01, 2020 USD ($)	Dec. 31, 2019 item
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 818,000,000.0		$ 818,000,000.0
Loans available for sale, unpaid principal amount		826,000,000.0		826,000,000.0
Gains (losses) recognized from changes in fair value				(5,300,000)	$ (285,000)
Changes in fair value gain (loss) of loans, credit weaknesses amount				(6,400,000)	(15,000)
Loans Receivable, Gross		5,263,346,000		5,263,346,000		$ 3,739,171,000
Unrealized loss to reflect write-down		4,000,000.0
Loan, disposition costs		9,500,000
Number of securities securitized | item									6
Other real estate owned		18,873,000		$ 18,873,000		$ 18,873,000	$ 0
Number of troubled debt restructured loans | loan	[1]			11		10
Interest which would have been earned on loans classified as non-accrual				$ 133,000	247,000
Commitments to lend additional funds to loan customers whose terms have been modified in troubled debt restructurings		0		0		$ 0
Non-accrual loans, income				0
Nonaccrual loans, Income Reversed				208,000	$ 39,000
Troubled debt restructured loans balance	[1]			5,284,000		1,479,000
Financing receivable, troubled debt restructured loans, reserves		447,000		447,000		476,000
Assets		7,777,074,000		7,777,074,000		6,843,239,000
Purchase of lease receivables		6,300,000
Remaining balance of PPP loan reimbursed		6,600,000		6,600,000
Foreclosed property		20,900,000		$ 20,900,000
Percent of credit enhancement				50.00%
Total loans, gross		5,263,346,000		$ 5,263,346,000		3,739,171,000
Allowance for credit losses on off-balance sheet credit		2,800,000		2,800,000		1,400,000
Federal Reserve Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		0		0
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral without Right [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		2,010,000,000.00		2,010,000,000.00
Federal Home Loan Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		0		0
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral without Right [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		1,410,000,000		$ 1,410,000,000
Equity Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, advanced rate calculation, percentage				50.00%
Mutual Fund [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, advanced rate calculation, percentage				50.00%
Debt Securities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, advanced rate calculation, percentage				80.00%
CRE2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		12,600,000		$ 12,600,000
Number of senior tranches remaining | item				1
Excess credit support percent				50.00%
Percent of remaining security balances incurred, prior to any loss				50.00%
SBLOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gains (losses) recognized from changes in fair value							$ 0
Loans Receivable, Gross		1,265,017,000		$ 1,265,017,000		1,141,316,000
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduction from loans sold			$ (1,000,000.0)
Advisor Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		168,559,000		168,559,000		115,770,000
Total loans, gross	[2]	168,559,000		$ 168,559,000		115,770,000
Loan Amount, Loan-To-Value Ratio				70.00%
SBL Non-Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		104,407,000		$ 104,407,000		$ 132,745,000
Number of troubled debt restructured loans | loan				8		9
Troubled debt restructured loans balance				$ 657,000		$ 1,231,000
Total loans, gross		116,080,000		116,080,000		147,722,000
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		$ 2,150,000,000		$ 2,150,000,000
Number of securities securitized | loan		3		3
Debt instrument term, extension period				2 years
Excess credit support percent				50.00%
Percent of remaining security balances incurred, prior to any loss				50.00%
Remaining loans expected to be liquidated through sale | loan				2
Assets		$ 60,900,000		$ 60,900,000				$ 28,400,000
Due To Servicer		573,000		573,000
Remaining Principal Amount To Be Repaid On Securities		58,100,000		58,100,000
Total exposure in security				25,000,000.0
Commercial Loan [Member] | Apartment Building Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		2,050,000,000.00		2,050,000,000.00
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with deteriorated credit quality		0		0		0
Financial Asset Acquired and No Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase of lease receivables		12,500,000
Estimated Fair Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 818,040,000		$ 818,040,000		$ 1,388,416,000

[1] Troubled debt restructurings include non-accrual loans of $1.2 million and $656,000 at September 30, 2022 and December 31, 2021, respectively.

[2] In 2020 the Company began originating loans to investment advisors for purposes of debt refinance, acquisition of another firm or internal succession. Maximum loan amounts are subject to loan-to-value ratios of 70%, based on third-party business appraisals, but may be increased depending upon the debt service coverage ratio. Personal guarantees and blanket business liens are obtained as appropriate.