Fair Value Measurement of Assets and Liabilities (Assets Measured at Fair Value on a Non-Recurring Basis) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Fair Value [Member]
Collateral dependent impaired loans	$ 57,467	[1]	$ 53,330	[1]
Loan servicing rights	7,263		11,328
Foreclosed assets	9,152		19,986
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Collateral dependent impaired loans		[1]		[1]
Loan servicing rights
Foreclosed assets
Significant Other Observable Inputs (Level 2) [Member]
Collateral dependent impaired loans		[1]		[1]
Loan servicing rights
Foreclosed assets
Significant Unobservable Inputs (Level 3) [Member]
Collateral dependent impaired loans	57,467	[1]	53,330	[1]
Loan servicing rights	7,263		11,328
Foreclosed assets	$ 9,152		$ 19,986

[1] Excludes pooled covered loans acquired in the FDIC-assisted transactions.