Goodwill and Core Deposit Intangibles Goodwill Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance, beginning of year	$ 22,950	$ 17,428
Goodwill acquired during the year	27,882	5,522
Impairment losses	0	0
Balance, end of year	50,832	22,950
Accumulated impairment losses at end of year	$ 0	$ 0