Loans (Narrative) (Details)		3 Months Ended	6 Months Ended		12 Months Ended
		Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 995,500,000	$ 995,500,000
Loans available for sale, unpaid principal amount		999,900,000	999,900,000
Gains (losses) recognized from changes in fair value			1,500,000	$ (478,000)
Changes in fair value gain (loss) of loans, credit weaknesses amount			650,000	246,000
Loans Receivable, Gross		4,748,081,000	4,748,081,000		$ 3,739,171,000
Deficiency from defaulted loans			$ 7,200,000
Percent of protection remaining in subordinate tranches			41.10%
Securities subordinated, amount			$ 31,400,000
Other real estate owned		18,873,000	$ 18,873,000		$ 18,873,000	$ 0
Number of troubled debt restructured loans | loan	[1]		12		10
Interest which would have been earned on loans classified as non-accrual			$ 68,000	172,000
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			198,000	$ 36,000
Troubled debt restructured loans balance	[1]		5,296,000		1,479,000
Financing receivable, troubled debt restructured loans, reserves		609,000	609,000		476,000
Assets		7,119,735,000	7,119,735,000		6,843,239,000
Purchase of lease receivables		22,200,000
Total loans, gross		4,748,081,000	4,748,081,000		3,739,171,000
Allowance for credit losses on off-balance sheet credit		2,700,000	2,700,000		2,700,000
Federal Reserve Bank Advances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		385,000,000.0	385,000,000.0
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral without Right [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		1,920,000,000	1,920,000,000
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		1,460,000,000	$ 1,460,000,000
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
SBLOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gains (losses) recognized from changes in fair value						$ 0
Loans Receivable, Gross		1,257,060,000	1,257,060,000		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		155,235,000	155,235,000		115,770,000
Total loans, gross	[2]	155,235,000	$ 155,235,000		115,770,000
Loan Amount, Loan-To-Value Ratio			70.00%
Single Performing Retail Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from payment of loans			$ 8,000,000.0
Foreclosed property		32,600,000	32,600,000
Collateralized amount		20,900,000	20,900,000
Three Defaulted Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateralized amount		53,500,000	53,500,000
Total loans, gross		60,700,000	60,700,000
SBL Non Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Gross		100,494,000	$ 100,494,000		$ 132,745,000
Number of troubled debt restructured loans | loan			9		9
Troubled debt restructured loans balance			$ 665,000		$ 1,231,000
Total loans, gross		112,854,000	112,854,000		147,722,000		$ 122,400,000
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		7,300,000
Estimated Fair Value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 995,493,000	$ 995,493,000		$ 1,388,416,000

[1] Troubled debt restructurings include non-accrual loans of $1.2 million and $656,000 at June 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.