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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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