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Note 12 - Minimum Regulatory Capital Requirement (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Actual |  |  | Minimum Capital Requirement (1) |  |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
December 31, 201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 191,006 |  |  |  | 26.575 | % |  | $ | 57,499 |  |  |  | 8.625 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 188,095 |  |  |  | 26.296 | % |  |  | 57,224 |  |  |  | 8.625 | % |  | $ | 71,529 |  |  |  | 10.000 | %
Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 182,706 |  |  |  | 25.420 | % |  | $ | 43,124 |  |  |  | 6.625 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 179,795 |  |  |  | 25.136 | % |  |  | 42,918 |  |  |  | 6.625 | % |  | $ | 57,224 |  |  |  | 8.000 | %
Common Equity Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 182,706 |  |  |  | 25.420 | % |  | $ | 32,343 |  |  |  | 5.125 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 179,795 |  |  |  | 25.136 | % |  |  | 32,188 |  |  |  | 5.125 | % |  | $ | 46,494 |  |  |  | 6.500 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 182,706 |  |  |  | 15.121 | % |  | $ | 48,333 |  |  |  | 4.000 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 179,795 |  |  |  | 14.964 | % |  |  | 48,060 |  |  |  | 4.000 | % |  | $ | 60,075 |  |  |  | 5.000 | %
|  | Actual |  |  | Minimum Capital Requirement |  |  | Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 184,054 |  |  |  | 25.527 | % |  | $ | 57,681 |  |  |  | 8.000 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 181,926 |  |  |  | 25.300 | % |  |  | 57,526 |  |  |  | 8.000 | % |  | $ | 71,908 |  |  |  | 10.000 | %
Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 175,757 |  |  |  | 24.376 | % |  | $ | 43,261 |  |  |  | 6.000 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 173,629 |  |  |  | 24.146 | % |  |  | 43,145 |  |  |  | 6.000 | % |  | $ | 57,526 |  |  |  | 8.000 | %
Common Equity Tier 1 capital (to risk weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 175,757 |  |  |  | 24.376 | % |  | $ | 32,446 |  |  |  | 4.500 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 173,629 |  |  |  | 24.146 | % |  |  | 32,358 |  |  |  | 4.500 | % |  | $ | 46,740 |  |  |  | 6.500 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NBI consolidated |  | $ | 175,757 |  |  |  | 15.088 | % |  | $ | 46,594 |  |  |  | 4.000 | % |  |  | N/A |  |  |  | N/A |
NBB |  |  | 173,629 |  |  |  | 14.888 | % |  |  | 46,648 |  |  |  | 4.000 | % |  | $ | 58,310 |  |  |  | 5.000 | %

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