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Employee Benefits (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	350,000
Amount of shares purchased in the open market	$ 0	$ 2,851,000	$ 2,990,000
Dividends payable	1,692,000	1,745,000
Accrued dividends	675,000	701,000
Stock-based compensation expense	6,518,000	6,001,000	5,835,000
Amortization of intangible assets	4,149,000	1,889,000	1,624,000
Mutual fund incentive award expense	700,000	600,000
Unvested mutual fund awards	2,000,000
Mutual fund award liability	1,500,000	1,000,000
General and Administrative Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amortization of intangible assets	$ 4,100,000	$ 1,900,000	$ 1,600,000
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total number of shares that may be issued under the stock based compensation Plan (including predecessor plans to the Plan)	6,248,100
Shares remain available for issuance	646,000
Vested, shares	294,340
Remaining unrecognized compensation cost	$ 9,400,000
Remaining unrecognized compensation cost recognized over a remaining weighted average period	2 years 4 months 24 days
Number of vested shares from employees on the date vesting	67,743
Nonvested restricted shares (in shares)	1,132,861	1,098,008
Restricted Stock | Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted shares granted to employees vesting period	3 years
Restricted Stock | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted shares granted to employees vesting period	1 year
Mutual Fund [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Mutual fund vesting period	2 years
Benefit Plans [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years
Percentage of compensation	6.00%

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