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Employee Benefit Plans - Summary of Benefit Obligations and Funded Status of the Plan (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year $ 152,232,000 $ 157,328,000  
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 168,433,000 153,960,000  
Service cost 2,500,000 2,283,000 $ 2,248,000
Interest cost 3,416,000 4,507,000 5,266,000
Actuarial (gain) loss (4,688,000) 14,376,000  
Plan amendment   (313,000)  
Benefits paid (5,742,000) (6,380,000)  
Projected benefit obligation at end of year 163,919,000 168,433,000 153,960,000
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 185,716,000 167,720,000  
Actual return on plan assets 22,809,000 24,376,000  
Employer contribution 0 0 3,000,000.0
Benefits paid (5,742,000) (6,380,000)  
Fair value of plan assets at end of year 202,783,000 185,716,000 167,720,000
Amounts recognized in the statement of financial position:      
Funded status 38,864,000 17,284,000  
Net amounts recognized as receivable pension costs in the consolidated balance sheets 38,864,000 17,284,000  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized prior service credit (193,000) (227,000)  
Unrecognized net loss 2,700,000 21,726,000  
Net amounts recognized in accumulated other comprehensive income (before tax) $ 2,507,000 $ 21,499,000  
Weighted average assumptions used to determine benefit obligations:      
Discount rate 3.03% 2.74%  
Rate of compensation increase 3.62% 3.30%  
Expected long-term return on assets 5.74% 6.11%  
Farmers Capital Bank Corporation Postretirement Medical Benefit Plan [Member]      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 12,695,000 $ 12,632,000  
Interest cost 230,000 360,000  
Actuarial (gain) loss (1,096,000) 302,000  
Participant contributions 342,000 353,000  
Benefits paid (926,000) (952,000)  
Projected benefit obligation at end of year 11,245,000 12,695,000 $ 12,632,000
Amounts recognized in the statement of financial position:      
Funded status (11,245,000) (12,695,000)  
Net amounts recognized as receivable pension costs in the consolidated balance sheets (11,245,000) (12,695,000)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized prior service credit (2,568,000) (2,792,000)  
Unrecognized net loss 249,000 1,388,000  
Net amounts recognized in accumulated other comprehensive income (before tax) $ (2,319,000) $ (1,404,000)  
Weighted average assumptions used to determine benefit obligations:      
Discount rate 2.96% 2.65%