Business Combinations, Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Gross Amount	$ 26,896	$ 17,282
Accumulated Amortization	(16,934)	(15,180)
Core Banking | Core Deposit Intangible
Business Acquisition [Line Items]
Gross Amount	21,231	11,617
Accumulated Amortization	(11,418)	(9,694)
Core Banking | Branch Acquisition Intangible
Business Acquisition [Line Items]
Gross Amount	257	257
Accumulated Amortization	(257)	(257)
Insurance | Customer List
Business Acquisition [Line Items]
Gross Amount	5,408	5,408
Accumulated Amortization	$ (5,259)	$ (5,229)