Goodwill and Other Intangible Assets (Other Intangible Assets) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Gross Intangible Assets	$ 100,772	$ 98,966
Accumulated Amortization	(75,708)	(72,153)
Valuation Allowance	(1,062)	(1,163)
Net Intangible Assets	24,002	25,650
Loan Servicing Rights [Member]
Gross Intangible Assets	67,507	65,701
Accumulated Amortization	(54,782)	(53,210)
Valuation Allowance	(1,062)	(1,163)
Net Intangible Assets	11,663	11,328
Core Deposits [Member]
Gross Intangible Assets	27,144	27,144
Accumulated Amortization	(18,945)	(17,312)
Net Intangible Assets	8,199	9,832
Other [Member]
Gross Intangible Assets	6,121	6,121
Accumulated Amortization	(1,981)	(1,631)
Net Intangible Assets	$ 4,140	$ 4,490