9. Income Taxes (Details-Income Tax Expense) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current federal tax expense	$ 18,653	$ 1,348	$ 977
Current state tax expense	1,146	1,316	365
Deferred federal tax expense	4,233	18,338	13,306
Deferred state tax expense (benefit)	2,669	1,724	1,520
Income tax expense	$ 26,701	$ 22,726	$ 16,168