Note 14 - Regulatory Matters/Subsequent Event - Risk-based Capital and Related Ratios (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Total capital (to risk-weighted assets), Ratio |
8.00%
|
|
|
8.00%
|
| Total capital (to risk-weighted assets), Minimum required for capital adequacy purposes |
8.00%
|
8.00%
|
|
|
| Total capital (to risk-weighted assets), Minimum required for capital adequacy purposes with conservation buffer |
8.625%
|
|
|
|
| Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action |
10.00%
|
10.00%
|
[1] |
10.00%
|
| Tier I capital (to risk-weighted assets), Ratio |
6.00%
|
|
|
4.00%
|
| Tier I capital (to risk-weighted assets), Minimum required for capital adequacy purposes |
6.00%
|
6.00%
|
|
|
| Tier I capital (to risk-weighted assets), Minimum required for capital adequacy purposes with conservation buffer |
6.625%
|
|
|
|
| Tier I capital (to risk-weighted assets), To be well capitalized under prompt corrective action |
8.00%
|
8.00%
|
[1] |
6.00%
|
| Tier I common equity (to risk-weighted assets), Ratio |
4.50%
|
|
|
|
| Tier I common equity (to risk-weighted assets), Minimum required for capital adequacy purposes |
4.50%
|
4.50%
|
|
|
| Tier I common equity (to risk-weighted assets), Minimum required for capital adequacy purposes with conservation buffer |
5.125%
|
|
|
|
| Tier I common equity (to risk-weighted assets), To be well capitalized under prompt corrective action |
6.50%
|
6.50%
|
[1] |
|
| Tier I capital (to average assets), Ratio |
4.00%
|
|
|
|
| Tier I capital (to average assets), Minimum required for capital adequacy purposes |
4.00%
|
4.00%
|
|
|
| Tier I capital (to average assets), Minimum required for capital adequacy purposes with conservation buffer |
4.00%
|
|
|
|
| Tier I capital (to average assets), To be well capitalized under prompt corrective action |
5.00%
|
5.00%
|
[1] |
|
| Parent Company [Member] |
|
|
|
|
| Total capital (to risk-weighted assets), Amount |
$ 96,827
|
$ 93,835
|
|
|
| Total capital (to risk-weighted assets), Ratio |
12.06%
|
11.79%
|
|
|
| Tier I capital (to risk-weighted assets), Amount |
$ 82,159
|
$ 74,945
|
|
|
| Tier I capital (to risk-weighted assets), Ratio |
10.23%
|
9.42%
|
|
|
| Tier I common equity (to risk-weighted assets), Amount |
$ 80,049
|
$ 74,945
|
|
|
| Tier I common equity (to risk-weighted assets), Ratio |
9.97%
|
9.42%
|
|
|
| Tier I capital (to average assets), Amount |
$ 82,159
|
$ 74,945
|
|
|
| Tier I capital (to average assets), Ratio |
7.53%
|
7.27%
|
|
|
| Total risk-weighted assets, Amount |
$ 803,026
|
$ 795,887
|
|
|
| Total average assets, Amount |
1,090,665
|
1,031,426
|
|
|
| Subsidiaries [Member] |
|
|
|
|
| Total capital (to risk-weighted assets), Amount |
$ 102,786
|
$ 110,039
|
|
|
| Total capital (to risk-weighted assets), Ratio |
12.81%
|
13.83%
|
|
|
| Tier I capital (to risk-weighted assets), Amount |
$ 94,118
|
$ 100,949
|
|
|
| Tier I capital (to risk-weighted assets), Ratio |
11.73%
|
12.69%
|
|
|
| Tier I common equity (to risk-weighted assets), Amount |
$ 94,118
|
$ 100,949
|
|
|
| Tier I common equity (to risk-weighted assets), Ratio |
11.73%
|
12.69%
|
|
|
| Tier I capital (to average assets), Amount |
$ 94,118
|
$ 100,949
|
|
|
| Tier I capital (to average assets), Ratio |
8.63%
|
9.79%
|
|
|
| Total risk-weighted assets, Amount |
$ 802,610
|
$ 795,490
|
|
|
| Total average assets, Amount |
$ 1,090,550
|
$ 1,030,828
|
|
|
|
|