Note 18 - Income Taxes - Difference Between Applicable Income Taxes and the Amount Derived by Applying Statutory (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Computed tax expense at statutory federal rate, amount | $ 18,972 | $ 9,074 | $ 14,997 | ||||||||
| Computed tax expense at statutory federal rate | 35.00% | 35.00% | 35.00% | ||||||||
| Tax-exempt income, amount | $ (758) | $ (622) | $ (401) | ||||||||
| Tax-exempt income | (1.40%) | (2.40%) | (0.90%) | ||||||||
| State tax (net of federal tax benefit), amount | $ 425 | $ 299 | $ 215 | ||||||||
| State tax (net of federal tax benefit) | 0.80% | 1.20% | 0.50% | ||||||||
| Non-deductible merger expense, amount | $ 105 | $ 105 | |||||||||
| Non-deductible merger expense | 0.40% | 0.20% | |||||||||
| Excess tax benefit – stock based compensation, amount | $ (565) | ||||||||||
| Excess tax benefit – stock based compensation | (1.00%) | ||||||||||
| Other, net, amount | $ 94 | $ 316 | $ 89 | ||||||||
| Other, net | 0.10% | 1.20% | 0.20% | ||||||||
| Total | $ 4,684 | $ 4,346 | $ 4,810 | $ 4,328 | $ (3,276) | $ 4,084 | $ 4,296 | $ 4,068 | $ 18,168 | $ 9,172 | $ 15,005 |
| Total income tax expense | 33.50% | 35.40% | 35.00% | ||||||||