Goodwill and Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Indefinite-lived Intangible Assets by Major Class [Line Items]
Total other intangible assets, net	$ 49,424	$ 17,621
Community banking
Indefinite-lived Intangible Assets by Major Class [Line Items]
Total net carrying amount	31,760	11,845
Community banking | Core deposit and other intangibles:
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross carrying amount	55,366	37,272
Accumulated amortization	(29,406)	(25,427)
Net carrying amount	25,960	11,845
Specialty finance | Customer list intangibles:
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross carrying amount	1,958	1,972
Accumulated amortization	(1,436)	(1,298)
Net carrying amount	522	674
Wealth management | Customer list and other intangibles:
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross carrying amount	20,430	7,940
Accumulated amortization	(3,288)	(2,838)
Net carrying amount	17,142	5,102
Trademarks | Community banking
Indefinite-lived Intangible Assets by Major Class [Line Items]
Carrying amount	$ 5,800	$ 0