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Note 19 - Parent Company Only - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Other assets	$ 22,137	$ 15,357
TOTAL ASSETS	1,654,145	1,290,893
LIABILITIES AND STOCKHOLDERS' EQUITY
Subordinated debt	6,500	0
Other liabilities	12,186	10,985
Stockholders' equity	244,452	197,368	$ 188,443
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,654,145	1,290,893
Parent Company [Member]
ASSETS
Cash	6,485	7,389
Other assets	109	6
TOTAL ASSETS	251,029	197,412
LIABILITIES AND STOCKHOLDERS' EQUITY
Subordinated debt	6,500	0
Other liabilities	77	44
Stockholders' equity	244,452	197,368
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	251,029	197,412
Subsidiaries [Member] | Citizens and Northern Bank [Member]
ASSETS
Equity method investment	228,413	174,795
Subsidiaries [Member] | Citizens and Northern Investment Corporation [Member]
ASSETS
Equity method investment	12,353	11,697
Subsidiaries [Member] | Bucktail Life Insurance Company [Member]
ASSETS
Equity method investment	$ 3,669	$ 3,525

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