Other Intangible Assets (Net Carrying Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other intangible assets:
Total other intangible assets	$ 38,104	$ 33,080
Core deposit intangible assets [Member]
Other intangible assets:
Total other intangible assets	26,654	20,863
Mortgage servicing rights [Member]
Other intangible assets:
Total other intangible assets	$ 11,122	$ 12,217	$ 3,423	$ 3,478