Segment Reporting (Business Segment Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Goodwill	$ 65,840	$ 66,417	$ 60,402
Other intangible assets, net	8,863	9,223
Assets	4,105,210	3,710,340
Banking [Member]
Segment Reporting Information [Line Items]
Goodwill	48,536	48,536	48,536
Other intangible assets, net	373	579
Assets	4,069,086	3,678,230
Non-Banking [Member]
Segment Reporting Information [Line Items]
Goodwill	17,304	17,881	$ 11,866
Other intangible assets, net	8,490	8,644
Assets	31,466	31,166
Holding Company and Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 4,658	$ 944