Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013	Oct. 16, 2015
Goodwill [Line Items]
Goodwill	$ 99,227	$ 48,376		$ 48,376
Accumulated impairment losses	(3,570)	(3,570)		(3,570)
Reported goodwill	95,657	44,806		44,806
Activity for the year		(50,851)	[1]	0
Banking
Goodwill [Line Items]
Goodwill	91,753	40,902		40,902
Accumulated impairment losses	0	0		0
Reported goodwill	91,753	40,902		40,902
Activity for the year		(50,851)	[1]	0
Financial Services
Goodwill [Line Items]
Goodwill	7,474	7,474		7,474
Accumulated impairment losses	(3,570)	(3,570)		(3,570)
Reported goodwill	3,904	3,904		3,904
Activity for the year	$ 0	$ 0	[1]	$ 2,830
SBM Financial, Inc. [Member]
Goodwill [Line Items]
Reported goodwill					$ 50,851

[1] On October 16, 2015, the Company completed its acquisition of SBM and goodwill of $50.9 million was generated. Refer to Note 2 for additional details and discussion.