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Note 18 - Regulatory Matters - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total capital to risk-weighted assets - actual amount $ 228,057 $ 199,226
Total capital to risk-weighted assets - actual ratio 20.70% 24.42%
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 115,689 $ 85,653
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds ratio 10.50% 10.50%
Tier 1 capital to risk-weighted assets - actual amount $ 211,388 $ 189,589
Tier 1 capital to risk-weighted assets - actual ratio 19.19% 23.24%
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 93,653 $ 69,338
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds ratio 8.50% 8.50%
Common equity Tier 1 - amount $ 211,388 $ 189,589
Common equity Tier 1 - ratio 19.19% 23.24%
Common equity Tier 1 - minimum to meet the corporation's policy thresholds amount $ 77,126 $ 57,102
Common equity Tier 1 - minimum to meet the corporation's policy thresholds ratio 7.00% 7.00%
Tier 1 capital average - amount $ 211,388 $ 189,589
Tier 1 capital average - ratio 13.10% 14.78%
Tier 1 capital average - minimum to meet the corporation's policy threshold amount $ 129,126 $ 102,634
Tier 1 capital average - minimum to meet the corporation's policy threshold ratio 8.00% 8.00%
Citizens and Northern Bank [Member]    
Total capital to risk-weighted assets - actual amount $ 205,863 $ 176,499
Total capital to risk-weighted assets - actual ratio 18.75% 21.75%
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 115,260 $ 85,202
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds ratio 10.50% 10.50%
Total capital to risk-weighted assets - minimum capital requirement amount $ 87,817 $ 64,916
Minimum total capital ratio 8.00% 8.00%
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer amount $ 115,260 $ 80,130
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio 10.50% 9.875%
Total capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount $ 109,771 $ 81,145
Total capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions ratio 10.00% 10.00%
Tier 1 capital to risk-weighted assets - actual amount $ 195,694 $ 166,862
Tier 1 capital to risk-weighted assets - actual ratio 17.83% 20.56%
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 93,306 $ 68,976
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds ratio 8.50% 8.50%
Tier 1 capital to risk-weighted assets - minimum capital requirement amount $ 65,863 $ 48,687
Minimum tier 1 capital ratio 6.00% 6.00%
Tier 1 captial to risk-weighted assets - minimum capital requirement with conservation buffer amount $ 93,306 $ 63,901
Tier 1 capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio 8.50% 7.875%
Tier 1 capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount $ 87,817 $ 64,916
Tier 1 capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions ratio 8.00% 8.00%
Common equity Tier 1 - amount $ 195,694 $ 166,862
Common equity Tier 1 - ratio 17.83% 20.56%
Common equity Tier 1 - minimum to meet the corporation's policy thresholds amount $ 76,840 $ 56,801
Common equity Tier 1 - minimum to meet the corporation's policy thresholds ratio 7.00% 7.00%
Common equity Tier 1 - minimum capital requirement amount $ 49,397 $ 36,515
Minimum common equity tier 1 capital ratio 4.50% 4.50%
Common equity Tier 1 - capital conservation buffer amount $ 76,840 $ 51,730
Common equity Tier 1 - capital conservation buffer ratio 7.00% 6.375%
Common equity Tier 1 Capital - minimum to be well capitalized under prompt corrective action provisions amount $ 71,351 $ 52,744
Common equity Tier 1 Capital - minimum to be well capitalized under prompt corrective action provisions ratio 6.50% 6.50%
Tier 1 capital average - amount $ 195,694 $ 166,862
Tier 1 capital average - ratio 12.24% 13.16%
Tier 1 capital average - minimum to meet the corporation's policy threshold amount $ 127,879 $ 101,430
Tier 1 capital average - minimum to meet the corporation's policy threshold ratio 8.00% 8.00%
Tier 1 capital average - minimum capital amount $ 63,940 $ 50,715
Tier 1 capital average - minimum capital ratio 4.00% 4.00%
Tier 1 capital average - minimum to be well capitalized amount $ 79,925 $ 63,394
Tier 1 capital average - minimum to be well capitalized ratio 5.00% 5.00%