Goodwill (Changes in Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 98,267	$ 99,227	$ 98,267
Accumulated impairment losses	(3,570)	(3,570)	(3,570)
Reported goodwill	94,697	95,657	94,697
Activity for the year		960
Banking
Goodwill [Line Items]
Goodwill	90,793	91,753	90,793
Accumulated impairment losses	0	0	0
Reported goodwill	90,793	91,753	90,793
Activity for the year		960
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