Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current federal	$ 43,777	$ 17,378	$ 41,441
Current state	1,689	4,241	1,487
Total current provision	45,466	21,619	42,928
Deferred federal	(6,127)	15,457	21,483
Deferred state	(1,712)	1,228	2,054
Total deferred provision	(7,839)	16,685	23,537
Total included in net income	37,627	38,304	66,465
Hancock [Member]
Total included in net income	$ (6,617)	$ (6,334)	$ (3,399)