Other Intangible Assets (Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 6,090	$ 10,046	$ 8,444
Core deposit intangible assets
Finite-Lived Intangible Assets [Line Items]
Remaining weighted-average useful life of intangible assets acquired	7 years 6 months
Amortization of intangible assets	$ 6,000	$ 5,200	$ 4,100