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9. Income Taxes (Details - Income tax expense) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current federal tax expense $ 14,369 $ 22,872 $ 18,653
Current state tax expense 3,305 2,671 1,146
Deferred federal tax expense 10,131 (6,329) 4,233
Deferred state tax expense (benefit) 501 1,147 2,669
Income tax expense $ 28,306 $ 20,361 $ 26,701