Other Intangible Assets (Net Carrying Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other intangible assets:
Total other intangible assets	$ 15,388	$ 11,472
Core deposit intangible assets [Member]
Other intangible assets:
Total other intangible assets	11,910	7,879
Mortgage servicing rights [Member]
Other intangible assets:
Total other intangible assets	$ 3,478	$ 3,593	$ 3,782	$ 3,077