Other Intangible Assets (Net Carrying Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other intangible assets:
Total other intangible assets	$ 33,080	$ 13,424
Core deposit intangible assets [Member]
Other intangible assets:
Total other intangible assets	20,863	10,001
Mortgage servicing rights [Member]
Other intangible assets:
Total other intangible assets	$ 12,217	$ 3,423	$ 3,478	$ 3,593