Note 18 - Regulatory Matters - Regulatory Ratios of the Consolidated Company and Its Subsidiary Banks (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Common Equity Tier 1 Risk-based Capital, actual, amount	[1]	$ 196,919	$ 187,474
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1]	16.56%	16.43%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1]	$ 53,500	$ 51,349
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1]	4.50%	4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio
Tier 1 Risk-based Capital, actual, amount	[1]	$ 229,419	$ 219,974
Tier 1 Risk-based Capital, actual, ratio	[1]	19.30%	19.28%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1]	$ 71,334	$ 68,466
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1]	6.00%	6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio
Total Risk-based Capital, actual, amount	[1]	$ 239,234	$ 229,318
Total Risk-based Capital, actual, ratio	[1]	20.12%	20.10%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1]	$ 95,112	$ 91,288
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1]	8.00%	8.00%
Total Risk-based Capital, to Be Well-capitalized, amount
Total Risk-based Capital, to Be Well-capitalized, ratio
Tier 1 Leverage Capital, actual, amount	[2]	$ 229,419	$ 219,974
Tier 1 Leverage Capital, actual, ratio	[2]	13.75%	13.20%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2]	$ 66,763	$ 66,656
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2]	4.00%	4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount
Tier 1 Leverage Capital, to Be Well-capitalized, ratio
United Bank [Member]
Common Equity Tier 1 Risk-based Capital, actual, amount	[1],[3]	$ 165,488
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1],[3]	14.05%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]	$ 53,004
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]	4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]	$ 76,561
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]	6.50%
Tier 1 Risk-based Capital, actual, amount	[1],[3]	$ 165,488
Tier 1 Risk-based Capital, actual, ratio	[1],[3]	14.05%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]	$ 70,671
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]	6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]	$ 94,229
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]	8.00%
Total Risk-based Capital, actual, amount	[1],[3]	$ 175,271
Total Risk-based Capital, actual, ratio	[1],[3]	14.88%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]	$ 94,229
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]	8.00%
Total Risk-based Capital, to Be Well-capitalized, amount	[1],[3]	$ 117,786
Total Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]	10.00%
Tier 1 Leverage Capital, actual, amount	[2],[3]	$ 165,488
Tier 1 Leverage Capital, actual, ratio	[2],[3]	10.13%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2],[3]	$ 65,365
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2],[3]	4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount	[2],[3]	$ 81,706
Tier 1 Leverage Capital, to Be Well-capitalized, ratio	[2],[3]	5.00%
Farmers Bank and Capital Trust Company [Member]
Common Equity Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 64,016
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1],[3]		16.53%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 17,425
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 25,170
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		6.50%
Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 64,016
Tier 1 Risk-based Capital, actual, ratio	[1],[3]		16.53%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 23,234
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 30,978
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		8.00%
Total Risk-based Capital, actual, amount	[1],[3]		$ 66,720
Total Risk-based Capital, actual, ratio	[1],[3]		17.23%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 30,978
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		8.00%
Total Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 38,723
Total Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		10.00%
Tier 1 Leverage Capital, actual, amount	[2],[3]		$ 64,016
Tier 1 Leverage Capital, actual, ratio	[2],[3]		9.80%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2],[3]		$ 26,121
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2],[3]		4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount	[2],[3]		$ 32,651
Tier 1 Leverage Capital, to Be Well-capitalized, ratio	[2],[3]		5.00%
United Bank and Trust Company [Member]
Common Equity Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 58,180
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1],[3]		15.54%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 16,848
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 24,337
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		6.50%
Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 58,180
Tier 1 Risk-based Capital, actual, ratio	[1],[3]		15.54%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 22,465
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 29,953
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		8.00%
Total Risk-based Capital, actual, amount	[1],[3]		$ 61,680
Total Risk-based Capital, actual, ratio	[1],[3]		16.47%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 29,953
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		8.00%
Total Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 37,441
Total Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		10.00%
Tier 1 Leverage Capital, actual, amount	[2],[3]		$ 58,180
Tier 1 Leverage Capital, actual, ratio	[2],[3]		12.38%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2],[3]		$ 18,798
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2],[3]		4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount	[2],[3]		$ 23,497
Tier 1 Leverage Capital, to Be Well-capitalized, ratio	[2],[3]		5.00%
First Citizens Bank [Member]
Common Equity Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 28,324
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1],[3]		13.56%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 9,401
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 13,580
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		6.50%
Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 28,324
Tier 1 Risk-based Capital, actual, ratio	[1],[3]		13.56%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 12,535
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 16,714
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		8.00%
Total Risk-based Capital, actual, amount	[1],[3]		$ 29,590
Total Risk-based Capital, actual, ratio	[1],[3]		14.16%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 16,714
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		8.00%
Total Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 20,892
Total Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		10.00%
Tier 1 Leverage Capital, actual, amount	[2],[3]		$ 28,324
Tier 1 Leverage Capital, actual, ratio	[2],[3]		9.76%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2],[3]		$ 11,606
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2],[3]		4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount	[2],[3]		$ 14,507
Tier 1 Leverage Capital, to Be Well-capitalized, ratio	[2],[3]		5.00%
Citizens Bank of Northern Kentucky, Inc [Member]
Common Equity Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 24,661
Common Equity Tier 1 Risk-based Capital, actual, ratio	[1],[3]		15.24%
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 7,280
Common Equity Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		4.50%
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 10,516
Common Equity Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		6.50%
Tier 1 Risk-based Capital, actual, amount	[1],[3]		$ 24,661
Tier 1 Risk-based Capital, actual, ratio	[1],[3]		15.24%
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 9,707
Tier 1 Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		6.00%
Tier 1 Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 12,942
Tier 1 Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		8.00%
Total Risk-based Capital, actual, amount	[1],[3]		$ 26,534
Total Risk-based Capital, actual, ratio	[1],[3]		16.40%
Total Risk-based Capital, for Capital Adequacy Purposes, amount	[1],[3]		$ 12,942
Total Risk-based Capital, for Capital Adequacy Purposes, ratio	[1],[3]		8.00%
Total Risk-based Capital, to Be Well-capitalized, amount	[1],[3]		$ 16,178
Total Risk-based Capital, to Be Well-capitalized, ratio	[1],[3]		10.00%
Tier 1 Leverage Capital, actual, amount	[2],[3]		$ 24,661
Tier 1 Leverage Capital, actual, ratio	[2],[3]		10.68%
Tier 1 Leverage Capital, for Capital Adequacy Purposes, amount	[2],[3]		$ 9,234
Tier 1 Leverage Capital, for Capital Adequacy Purposes, ratio	[2],[3]		4.00%
Ter 1 Leverage Capital, to Be Well-capitalized, amount	[2],[3]		$ 11,543
Tier 1 Leverage Capital, to Be Well-capitalized, ratio	[2],[3]		5.00%

[1] Common Equity Tier 1 Risk-based, Tier 1 Risk-based, and Total Risk-based Capital ratios are computed by dividing a bank's Common Equity Tier 1, Tier 1, or Total Capital, as defined by regulation, by a risk-weighted sum of the bank's assets, with the risk weighting determined by general standards established by regulation.

[2] Tier 1 Leverage ratio is computed by dividing a bank's Tier 1 Capital by its total quarterly average assets, as defined by regulation.

[3] In February 2017, the Company merged United Bank & Trust Company, First Citizens Bank, Inc., and Citizens Bank of Northern Kentucky, Inc. into Farmers Bank & Capital Trust Company in Frankfort, KY, the name of which was immediately changed to United Bank & Capital Trust Company.