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PARENT COMPANY ONLY - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Other assets	$ 32,831	$ 22,137
TOTAL ASSETS	2,239,100	1,654,145
LIABILITIES AND STOCKHOLDERS' EQUITY
Subordinated debt	16,553	6,500
Other liabilities	27,692	12,186
Stockholders' equity	299,756	244,452	$ 197,368
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,239,100	1,654,145
Parent Company [Member]
ASSETS
Cash	7,246	6,485
Other assets	4	109
TOTAL ASSETS	316,468		$ 251,029
LIABILITIES AND STOCKHOLDERS' EQUITY
Subordinated debt	16,553	6,500
Other liabilities	159	77
Stockholders' equity	299,756	244,452
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	316,468	251,029
Subsidiaries [Member] | Citizens and Northern Bank
ASSETS
Investment in subsidiaries	292,455	228,413
Subsidiaries [Member] | Citizens and Northern Investment Corporation
ASSETS
Investment in subsidiaries	12,959	12,353
Subsidiaries [Member] | Bucktail Life Insurance Company
ASSETS
Investment in subsidiaries	$ 3,804	$ 3,669

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