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Employee Benefit Plans - Components of and Weighted-Average Assumptions Used in Determining Net Periodic Benefit Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components of net periodic benefit cost:      
Service cost—benefits earned during year $ 2,190 $ 2,500 $ 2,283
Interest cost on projected benefit obligation 4,114 3,416 4,507
Expected return on plan assets $ (11,572) $ (11,207) $ (10,433)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Employee Benefits Employee Benefits Employee Benefits
Amortization of prior service credit $ (34) $ (34) $ (34)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Employee Benefits Employee Benefits Employee Benefits
Amortization of net loss $ 506 $ 2,736 $ 3,192
Net periodic pension income (4,796) (2,589) (485)
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net gain for the period 4,353 (16,290) 432
Prior service credit     (313)
Amortization of prior service credit 34 34 34
Amortization of net loss (505) (2,736) (3,192)
Total recognized in other comprehensive loss (income) 3,882 (18,992) (3,039)
Total recognized in net periodic pension cost and other comprehensive income $ (914) $ (21,581) $ (3,524)
Weighted-average assumptions used to determine net periodic pension cost:      
Discount rate 3.03% 2.74% 3.38%
Rate of compensation increase 3.62% 3.30% 3.53%
Expected long-term return on assets 5.74% 6.11% 6.30%
Farmers Capital Bank Corporation Postretirement Medical Benefit Plan [Member]      
Components of net periodic benefit cost:      
Interest cost on projected benefit obligation $ 266 $ 230  
Amortization of prior service credit (224) (224)  
Amortization of net loss 43 43  
Net periodic pension income 85 49  
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net gain for the period (3,881) (1,097)  
Amortization of prior service credit 224 224  
Amortization of net loss (43) (43)  
Total recognized in other comprehensive loss (income) (3,700) (916)  
Total recognized in net periodic pension cost and other comprehensive income $ (3,615) $ (867)  
Weighted-average assumptions used to determine net periodic pension cost:      
Discount rate 5.10% 2.40%