Pro Forma Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
2016 acquisitions
Pro Forma Information
Net interest income and non-interest income	$ 424,242	$ 392,252
Net income	$ 120,929	116,577
2015 acquisitions
Pro Forma Information
Net interest income and non-interest income		401,140	$ 383,387
Net income		$ 115,613	$ 115,899