Loans (Narrative) (Details)		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($) loan	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 1,180,000,000
Loans available for sale, unpaid principal amount		1,180,000,000
Gains (losses) recognized from changes in fair value		1,200,000	$ (478,000)
Changes in fair value gain (loss) of loans, credit weaknesses amount		164,000	246,000
Loans Receivable, Gross		4,156,261,000		$ 3,739,171,000
Other real estate owned		$ 18,873,000		$ 18,873,000	$ 0
Number of troubled debt restructured loans | loan	[1]	14		10
Interest which would have been earned on loans classified as non-accrual		$ 41,000	162,000
Commitments to lend additional funds to loan customers whose terms have been modified in troubled debt restructurings		0		$ 0
Non-accrual loans, income		0
Nonaccrual loans, Income Reversed		55,000	$ 10,000
Troubled debt restructured loans balance	[1]	5,260,000		1,479,000
Financing receivable, troubled debt restructured loans, reserves		655,000		476,000
Assets		7,082,660,000		6,843,239,000
Total loans, gross		4,156,261,000		3,739,171,000
Allowance for credit losses on off-balance sheet credit		1,400,000		1,400,000
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral without Right [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		1,810,000,000
Federal Home Loan Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance against these lines		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		$ 1,390,000,000
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]
Proceeds from payment of loans		$ 12,600,000
Percent Of Excess Credit Support		47.00%
CRE5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from payment of loans		$ 12,600,000
Prepayments percentage, loans		15.00%
SBA Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross				46,600,000
Commercial Real Estate Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Assets		$ 70,300,000
Due To Servicer		3,500,000
Remaining Principal Amount To Be Repaid On Securities		66,200,000
SBLOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gains (losses) recognized from changes in fair value					$ 0
Loans Receivable, Gross		1,160,141,000		1,141,316,000
Advisor Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		146,461,000		115,770,000
Total loans, gross	[2]	$ 146,461,000		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		$ 109,020,000		$ 132,745,000
Number of troubled debt restructured loans | loan		12		9
Troubled debt restructured loans balance		$ 1,451,000		$ 1,231,000
Total loans, gross		122,387,000		147,722,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with deteriorated credit quality		0		0
Estimated Fair Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 1,180,885,000		$ 1,388,416,000

[1] Troubled debt restructurings include non-accrual loans of $745,000 and $656,000 at March 31, 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.