Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Oct. 16, 2015
Goodwill [Line Items]
Goodwill		$ 99,227	$ 48,376	$ 98,267
Accumulated impairment losses		(3,570)	(3,570)	(3,570)
Reported goodwill		95,657	44,806	94,697
Activity for the year	[1]	960	(50,851)
Banking
Goodwill [Line Items]
Goodwill		91,753	40,902	90,793
Accumulated impairment losses		0	0	0
Reported goodwill		91,753	40,902	90,793
Activity for the year	[1]	960	(50,851)
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	[1]	$ 0
SBM Financial, Inc. [Member]
Goodwill [Line Items]
Reported goodwill					$ 49,891

[1] On October 16, 2015, the Company completed the Merger and goodwill of $49.9 million after recording a measurement-period adjustment decreasing goodwill of $960,000 in 2016 upon completion of purchase accounting. Refer to Note 2 for additional details and discussion.