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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%

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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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