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Note 18 - Regulatory Matters - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total capital to risk-weighted assets - actual amount $ 199,226 $ 187,097
Total capital to risk-weighted assets - actual ratio 24.42% 23.07%
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 85,653 $ 85,144
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   $ 64,872
Minimum total capital ratio   8.00%
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer amount   $ 75,008
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio   9.25%
Total capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount   $ 81,090
Total capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions ratio   10.00%
Tier 1 capital to risk-weighted assets - actual amount $ 189,589 $ 177,981
Tier 1 capital to risk-weighted assets - actual ratio 23.24% 21.95%
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 69,338 $ 68,926
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   $ 48,654
Minimum tier 1 capital ratio   6.00%
Tier 1 captial to risk-weighted assets - minimum capital requirement with conservation buffer amount   $ 58,790
Tier 1 capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio   7.25%
Tier 1 capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount   $ 64,872
Tier 1 capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions ratio   8.00%
Common equity Tier 1 - amount $ 189,589 $ 177,981
Common equity Tier 1 - ratio 23.24% 21.95%
Common equity Tier 1 - minimum to meet the corporation's policy thresholds amount $ 57,102 $ 56,763
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   $ 36,490
Minimum common equity tier 1 capital ratio   4.50%
Common equity Tier 1 - capital conservation buffer amount   $ 46,626
Common equity Tier 1 - capital conservation buffer ratio   5.75%
Common equity Tier 1 Capital - minimum to be well capitalized under prompt corrective action provisions amount   $ 52,708
Common equity Tier 1 Capital - minimum to be well capitalized under prompt corrective action provisions ratio   6.50%
Tier 1 capital average - amount $ 189,589 $ 177,981
Tier 1 capital average - ratio 14.78% 14.23%
Tier 1 capital average - minimum to meet the corporation's policy threshold amount $ 102,634 $ 62,529
Tier 1 capital average - minimum to meet the corporation's policy threshold ratio 8.00% 5.00%
Tier 1 capital average - minimum capital amount   $ 50,023
Tier 1 capital average - minimum capital ratio   4.00%
Tier 1 capital average - minimum to be well capitalized amount   $ 62,529
Tier 1 capital average - minimum to be well capitalized ratio   5.00%
Citizens and Northern Bank [Member]    
Total capital to risk-weighted assets - actual amount $ 176,499 $ 165,142
Total capital to risk-weighted assets - actual ratio 21.75% 20.47%
Total capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 85,202 $ 84,694
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 $ 64,916 $ 64,528
Minimum total capital ratio 8.00% 8.00%
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer amount $ 80,130 $ 74,611
Total capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio 9.875% 9.25%
Total capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount $ 81,145 $ 80,661
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 $ 166,862 $ 156,026
Tier 1 capital to risk-weighted assets - actual ratio 20.56% 19.34%
Tier 1 capital to risk-weighted assets - minimum to meet the corporation's policy thresholds amount $ 68,976 $ 68,561
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 $ 48,687 $ 48,396
Minimum tier 1 capital ratio 6.00% 6.00%
Tier 1 captial to risk-weighted assets - minimum capital requirement with conservation buffer amount $ 63,901 $ 58,479
Tier 1 capital to risk-weighted assets - minimum capital requirement with conservation buffer ratio 7.875% 7.25%
Tier 1 capital to risk-weighted assets - minimum to be well capitalized under prompt corrective action provisions amount $ 64,916 $ 64,528
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 $ 166,862 $ 156,026
Common equity Tier 1 - ratio 20.56% 19.34%
Common equity Tier 1 - minimum to meet the corporation's policy thresholds amount $ 56,801 $ 56,462
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 $ 36,515 $ 36,297
Minimum common equity tier 1 capital ratio 4.50% 4.50%
Common equity Tier 1 - capital conservation buffer amount $ 51,730 $ 46,380
Common equity Tier 1 - capital conservation buffer ratio 6.375% 5.75%
Common equity Tier 1 Capital - minimum to be well capitalized under prompt corrective action provisions amount $ 52,744 $ 52,429
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 $ 166,862 $ 156,026
Tier 1 capital average - ratio 13.16% 12.63%
Tier 1 capital average - minimum to meet the corporation's policy threshold amount $ 101,430 $ 61,772
Tier 1 capital average - minimum to meet the corporation's policy threshold ratio 8.00% 5.00%
Tier 1 capital average - minimum capital amount $ 50,715 $ 49,418
Tier 1 capital average - minimum capital ratio 4.00% 4.00%
Tier 1 capital average - minimum to be well capitalized amount $ 63,394 $ 61,772
Tier 1 capital average - minimum to be well capitalized ratio 5.00% 5.00%