Note 2 - Acquisition - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
		Jun. 01, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Goodwill, Ending Balance			$ 136,529	$ 12,513	$ 136,529	$ 12,513	$ 12,513	$ 12,513	$ 12,513	$ 12,513
Consideration paid in acquisition					28,276
Total consideration paid					232,946
Goodwill			124,016	$ 0	124,016	$ 0
Kentucky Bancshares [Member]
Mortgage loans held for sale		$ 3,071
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities		395,862
Federal Home Loan Bank stock, at cost		7,072
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross		755,175
Allowance for credits losses on loans		(6,757)
Net loans		748,418
Premises and equipment, net		21,040
Bank owned life insurance		18,909
Accrued interest receivable		4,939
Goodwill, Ending Balance		0	124,000		$ 124,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		3,404
Other real estate owned		551
Mortgage servicing rights		1,662
Deferred income taxes, net		2,571
Other assets		4,555
Total assets acquired		1,265,311
Non-interest bearing		359,544
Interest bearing		679,674
Total deposits		1,039,218
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Securities Sold under Repurchase Agreement		11,360
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances		91,071
Accrued interest payable		505
Other liabilities		14,227
Total liabilities assumed		1,156,381
Net assets acquired		108,930
Consideration for common stock		204,670
Consideration paid in acquisition		28,276
Total consideration paid		232,946	$ 233,000
Goodwill		124,016
Kentucky Bancshares [Member] | Cash [Member]
Cash and due from banks		53,257
Kentucky Bancshares [Member] | As Recorded By Acquiree [Member]
Mortgage loans held for sale		3,071
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities		396,157
Federal Home Loan Bank stock, at cost		7,072
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross		755,932
Allowance for credits losses on loans		(9,491)
Net loans		746,441
Premises and equipment, net		27,401
Bank owned life insurance		18,909
Accrued interest receivable		4,939
Goodwill, Ending Balance		14,001
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Other real estate owned		674
Mortgage servicing rights		1,628
Deferred income taxes, net		1,856
Other assets		6,421
Total assets acquired		1,281,827
Non-interest bearing		359,544
Interest bearing		678,528
Total deposits		1,038,072
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Securities Sold under Repurchase Agreement		11,360
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances		88,581
Accrued interest payable		505
Other liabilities		16,231
Total liabilities assumed		1,154,749
Net assets acquired		127,078
Kentucky Bancshares [Member] | As Recorded By Acquiree [Member] | Cash [Member]
Cash and due from banks		53,257
Kentucky Bancshares [Member] | As Adjusted By Acquirer [Member]
Mortgage loans held for sale	[1]	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	[1],[2]	(295)
Federal Home Loan Bank stock, at cost	[1]	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross	[1],[3]	(757)
Allowance for credits losses on loans	[1],[4]	(2,734)
Net loans	[1]	1,977
Premises and equipment, net	[1],[5]	(6,361)
Bank owned life insurance	[1]	0
Accrued interest receivable	[1]	0
Goodwill, Ending Balance	[1],[6]	(14,001)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[1],[7]	3,404
Other real estate owned	[1],[8]	(123)
Mortgage servicing rights	[1],[9]	34
Deferred income taxes, net	[1],[10]	715
Other assets	[1],[11]	(1,866)
Total assets acquired	[1]	(16,516)
Non-interest bearing	[1]	0
Interest bearing	[1],[12]	1,146
Total deposits	[1]	1,146
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Securities Sold under Repurchase Agreement	[1]	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Advances	[1],[13]	2,490
Accrued interest payable	[1]	0
Other liabilities	[1],[14]	(2,004)
Total liabilities assumed	[1]	1,632
Net assets acquired	[1]	(18,148)
Kentucky Bancshares [Member] | As Adjusted By Acquirer [Member] | Cash [Member]
Cash and due from banks	[1]	$ 0

[1] See the following page for explanations or individual fair value adjustments.

[2] Adjustment based on Bancorp’s evaluation of the acquired investment portfolio. Approximately $91 million in AFS debt securities were sold by Bancorp shortly after acquisition.

[3] Adjustments to loans to reflect estimated fair value adjustments, including the following: (in thousands) Fair value adjustment - acquired non PCD loans $ 228 Fair value adjustment - acquired PCD loans (735) Eliminate unrecognized loan fees on acquired loans and fair value hedge (250) Net loan fair value adjustments $ (757)

[4] On January 1, 2020, Stock Yards Bancorp adopted ASC 326, “Financial Instruments – Credit Losses,” which required that loans held for investment be accounted for under the CECL framework. In accordance with ASC 326, “Financial Instruments – Credit Losses,” Kentucky Bancshares was not required to adopt CECL as of January 1, 2020. The net adjustment to allowance for credit losses includes the following: (in thousands) Reversal of historical KB allowance for credit losses on loans $ 9,491 Estimate of lifetime credit losses for PCD loans (6,757) Net change in allowance for credit losses $ 2,734

[5] Adjustment to premises and equipment to reflect the estimated fair value of acquired premises and equipment and right of use assets.

[6] Elimination of the historical KB goodwill of $14.0 million at the closing date.

[7] Calculation of core deposit intangible related to the acquisition.

[8] Adjustment to reflect the estimated fair value of other real estate owned.

[9] Adjustment to reflect the estimated fair value of mortgage servicing rights.

[10] Adjustment to net deferred tax assets associated with the effects of the purchase accounting adjustments.

[11] Adjustment to other assets to reflect the estimated fair value of prepaid and other assets.

[12] Adjustment to deposits to reflect the estimated fair value of time deposits in interest rates, which was based primarily on an analysis of current market interest rates and maturity dates.

[13] Adjustment to reflect the estimated fair value of Federal Home Loan Bank advances for differences in interest rates, which was based primarily on an analysis of current market interest rates and maturity dates. All KB FHLB advances were paid off immediately upon acquisition.

[14] Adjustment to other liabilities to establish the reserve for unfunded loan commitments under CECL and various accrual adjustments.