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Employee Benefit Plans - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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May 27, 2025 | May 27, 2024 | May 15, 2024 | May 16, 2023 | May 15, 2023 | May 18, 2022 | May 16, 2022 | Feb. 25, 2021 | Nov. 18, 2015 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 22, 2021 | Aug. 20, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits bases on years of service and compensation, years |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Number of equity shares |  |  |  |  |  |  |  |  |  |  | 55,300 | 55,300 |  |  |
Contribution of pension fund |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
Eligible employee contributions specified percentage one |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% | 3.00% |  |
Eligible employee contributions specified percentage two |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00% |  |
ESOP |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
Eligibility percentage of employee contributions |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00% |  |
Eligibility percentage of employee contributions |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% |  |
Stock options granted to selected participants |  |  |  |  |  |  |  |  |  |  | 146,900 |  |  |  |
Stock options granted to selected participants exercise price per share |  |  |  |  |  |  |  |  |  |  | $ 32.30 |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 |  |  |
Cash received from stock option exercised |  |  |  |  |  |  |  |  |  |  | 3,000,000.0 | 2,400,000 |  |  |
Tax benefit realized from stock options exercised |  |  |  |  |  |  |  |  |  |  | 300,000 | 200,000 |  |  |
Total intrinsic value of the outstanding shares |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |
Total intrinsic value of the shares exercisable |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | 16,931,905,000 | 16,927,125,000 |  |  |
Shareholder Return Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total expense for the KSOP/Compensation expense for the stock option component of the Plan |  |  |  |  |  |  |  |  |  |  | $ 200,000 | 400,000 | $ 400,000 |  |
Expense recognition period |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 6 days |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |
Restricted shares vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Percentage of shares earned by participants |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |
Total shareholder return measurement period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Grant date fair value |  |  |  |  |  |  |  |  |  |  | $ 36.51 |  |  |  |
Total unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
Scenario Forecast [Member] | Shareholder Return Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  | 14,640 |  |  |  |  |
Shares Vested in 2023 [Member] | Scenario Forecast [Member] | Shareholder Return Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested |  |  |  |  |  |  |  |  |  | 4,880 |  |  |  |  |
Shares Vested in 2024 [Member] | Scenario Forecast [Member] | Shareholder Return Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested |  |  |  |  |  |  |  |  |  | 4,880 |  |  |  |  |
Shares Vested in 2025 [Member] | Scenario Forecast [Member] | Shareholder Return Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested |  |  |  |  |  |  |  |  |  | 4,880 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | 15,000,000,000 | 15,000,000,000 |  |  |
key Officers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for Annual Bonus |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 | 3,500,000 | 1,700,000 |  |
KSOP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares held by KSOP |  |  |  |  |  |  |  |  |  |  | 443,848 |  |  |  |
Total expense for the KSOP/Compensation expense for the stock option component of the Plan |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 | $ 5,300,000 | 5,300,000 |  |
Future issuance under equity compensation plans |  |  |  |  |  |  |  |  |  |  | 165,438 | 207,199 |  |  |
Equity Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future issuance under equity compensation plans |  |  |  |  |  |  |  |  |  |  | 1,468,140 | 1,788,174 |  |  |
Additional common stock for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |
Selected Participants Including Certain Executive Officers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted to selected participants |  |  |  |  |  | 146,900 |  |  |  |  |  |  |  |  |
Stock options granted to selected participants exercise price per share |  |  |  |  |  | $ 32.30 |  |  |  |  |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total expense for the KSOP/Compensation expense for the stock option component of the Plan |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 | $ 800,000 | 600,000 |  |
Options grant expired |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Total unrecognized compensation expense related to non-vested stock option grants |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
Expense recognition period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options grant expired |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Service Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 176,703 |  |  |  |
Fair value of restricted stock granted |  |  |  |  |  |  |  |  |  |  | $ 32.33 |  |  |  |
Service Based Restricted Stock [Member] | 79616 Cliff Vesting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares vesting period |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |
Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 24,444 |  |  |  |
Restricted shares vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Performance Based Restricted Stock [Member] | Vesting on May 18, 2026 after the Completion of the Three-year Performance Period [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Performance Based Restricted Stock [Member] | Vesting on May 18, 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Performance Based Restricted Stock [Member] | Maximum [Member] | National Peer Group of Financial Institutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | $ 29,000,000,000.0 |  |  |  |
Performance Based Restricted Stock [Member] | Minimum [Member] | National Peer Group of Financial Institutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  | $ 11,600,000,000 |  |  |  |
2018 Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 2,694 |  |  |  |
Performance targets achieved, percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Pro-rata award achieved, percentage |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Number of share vested |  |  |  |  |  |  | 1,347 |  |  |  |  |  |  |  |
2018 Performance Based Restricted Stock [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested |  |  |  | 1,347 |  |  |  |  |  |  |  |  |  |  |
2018 Performance Based Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro-rata award achieved, percentage |  |  |  |  |  |  |  | 99.00% |  |  |  |  |  |  |
2018 Performance Based Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro-rata award achieved, percentage |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
2019 Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 5,352 |  |  |  |
Performance targets achieved, percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
2019 Performance Based Restricted Stock [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested |  |  | 2,676 |  | 2,676 |  |  |  |  |  |  |  |  |  |
2020 Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 10,100 |  |  |  |
Performance targets achieved, percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
2020 Performance Based Restricted Stock [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share vested | 5,050 | 5,050 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total expense for the KSOP/Compensation expense for the stock option component of the Plan |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 | $ 5,600,000 | $ 4,600,000 |  |
Expense recognition period |  |  |  |  |  |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  | 201,147 |  |  |  |
Fair value of restricted stock granted |  |  |  |  |  |  |  |  |  |  | $ 32.33 |  |  |  |
Total unrecognized compensation expense related to non-vested restricted stock grants |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |
Number of share vested |  |  |  |  |  |  |  |  |  |  | 127,532 |  |  |  |
Grant date fair value |  |  |  |  |  |  |  |  |  |  | $ 28.67 | $ 29.42 |  |  |
Farmers Capital Bank Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Postretirement medical benefit plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000.0
Defined benefit plan, Unrealized gain |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 |  |  |  |
Life of the plan |  |  |  |  |  |  |  |  |  |  | 17 years |  |  |  |
Defined Benefit Plan, Equity Securities, Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock fair market value |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ 1,900,000 |  |  |

X
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Period Type: | duration

X
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