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Employee Benefit Plans - Additional Information (Detail) - USD ($)					6 Months Ended	12 Months Ended
	May 16, 2022	May 19, 2021	May 16, 2021	Nov. 18, 2015	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	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
Maximum amount of pension plan invested					5.00%
Maximum common stock percentage of market value of investee					5.00%
Maximum percentage of investment in bonds or notes					5.00%
Maximum period for invested in bonds or notes issued					20 years
Number of equity shares						55,300	55,300
Contribution of pension fund						$ 0	$ 0	$ 3,000,000.0
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						147,200
Stock options granted to selected participants exercise price per share						$ 38.78
Total intrinsic value of options exercised						$ 1,000,000.0	$ 45,000
Cash received from stock option exercised						2,400,000	153,000
Tax benefit realized from stock options exercised						200,000	11,000
Total intrinsic value of the outstanding shares						2,400,000
Total intrinsic value of the shares exercisable						2,400,000
Assets						16,927,125,000	16,425,610,000
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						$ 400,000	400,000	$ 400,000
Expense recognition period						2 years 6 months
Number of shares granted						12,000		12,000
Restricted shares vesting period				3 years
Percentage of shares earned by participants				200.00%
Total shareholder return measurement period				3 years
Number of share vested						0
Grant date fair value						$ 22.60
Total unrecognized compensation expense						$ 300,000
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						$ 3,500,000	1,700,000	$ 2,100,000
KSOP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares held by KSOP						453,301
Total expense for the KSOP/Compensation expense for the stock option component of the Plan						$ 5,300,000	$ 5,300,000	4,400,000
Future issuance under equity compensation plans						207,199	246,769
Equity Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Future issuance under equity compensation plans						1,788,174	35,711
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		147,200
Stock options granted to selected participants exercise price per share		$ 38.78
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						$ 800,000	$ 600,000	900,000
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						128,821
Fair value of restricted stock granted						$ 38.67
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						17,571
Restricted shares vesting period						3 years
Performance Based Restricted Stock [Member] | Vesting on May 19, 2025 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 19, 2026 [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						$ 28,100,000,000
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						$ 11,800,000,000
2017 Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance targets achieved, percentage						85.00%
Number of share vested			1,225
2017 Performance Based Restricted Stock [Member] | Scenario Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share vested	1,225
2017 Time-based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted							2,550
2018 Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted							2,289
Performance targets achieved, percentage						85.00%
Pro-rata award achieved, percentage						75.00%
2018 Performance Based Restricted Stock [Member] | Scenario Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
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%
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						$ 600,000	$ 4,600,000	$ 4,200,000
Expense recognition period						1 year 2 months 12 days
Number of shares granted						146,392
Fair value of restricted stock granted						$ 38.68
Total unrecognized compensation expense related to non-vested restricted stock grants						$ 7,000,000.0
Number of share vested						121,211
Grant date fair value						$ 29.42	$ 32.90
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						$ 1,900,000	$ 1,700,000

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