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Employee Benefit Plans - Summary of Benefit Obligations and Funded Status of the Plan (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year $ 120,241,000 $ 152,232,000  
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 163,919,000 168,433,000  
Service cost 2,190,000 2,500,000 $ 2,283,000
Interest cost 4,114,000 3,416,000 4,507,000
Actuarial (gain) loss (36,981,000) (4,688,000)  
Benefits paid (6,115,000) (5,742,000)  
Projected benefit obligation at end of year 127,127,000 163,919,000 168,433,000
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 202,783,000 185,716,000  
Actual return on plan assets (29,762,000) 22,809,000  
Employer contribution 0 0 0
Benefits paid (6,115,000) (5,742,000)  
Fair value of plan assets at end of year 166,906,000 202,783,000 185,716,000
Amounts recognized in the statement of financial position:      
Funded status 39,779,000 38,864,000  
Net amounts recognized as receivable pension costs in the consolidated balance sheets 39,779,000 38,864,000  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized prior service credit (159,000) (193,000)  
Unrecognized net (gain) loss 6,548,000 2,700,000  
Net amounts recognized in accumulated other comprehensive income (before tax) $ 6,389,000 $ 2,507,000  
Weighted average assumptions used to determine benefit obligations:      
Discount rate 5.23% 3.03%  
Rate of compensation increase 3.84% 3.62%  
Expected long-term return on assets 6.82% 5.74%  
Farmers Capital Bank Corporation Postretirement Medical Benefit Plan [Member]      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 11,245,000 $ 12,695,000  
Interest cost 266,000 230,000  
Actuarial (gain) loss (3,881,000) (1,096,000)  
Participant contributions 320,000 342,000  
Benefits paid (831,000) (926,000)  
Projected benefit obligation at end of year 7,119,000 11,245,000 $ 12,695,000
Amounts recognized in the statement of financial position:      
Funded status   (11,245,000)  
Net amounts recognized as receivable pension costs in the consolidated balance sheets 7,119,000 (11,245,000)  
Amounts recognized in accumulated other comprehensive income consist of:      
Unrecognized prior service credit (2,343,000) (2,568,000)  
Unrecognized net (gain) loss (3,676,000) 249,000  
Net amounts recognized in accumulated other comprehensive income (before tax) $ (6,019,000) $ (2,319,000)  
Weighted average assumptions used to determine benefit obligations:      
Discount rate 5.20% 2.96%