Fair Value Measurements and Disclosures (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended													9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Impaired loans [Member]		Sep. 30, 2012 Mortgage servicing rights [Member]	Sep. 30, 2012 Appraisal adjustments [Member]		Sep. 30, 2012 Liquidation expenses [Member]		Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Impaired loans [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Mortgage servicing rights [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Maximum [Member] Impaired loans [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Maximum [Member] Mortgage servicing rights [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Minimum [Member] Impaired loans [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Minimum [Member] Mortgage servicing rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans	$ 34,470	$ 30,368										$ 5,629	$ 7,808	$ 5,629
Mortgage servicing rights												$ 457	$ 490		$ 457
Valuation techniques			Appraisal of collateral (1)	[1]	Discounted cash flow
Unobservable Input						Appraisal adjustments (2)	[2]	Liquidation expenses (2)	[2]
Remaining term																	30 years		1 year
Discount rate										9.16%	3.98%					0.00%	0.11%	(0.35%)	0.10%
Liquidation expenses																0.00%		(0.10%)

[1] Fair value is primarily determined through appraisals of the underlying collateral by independent parties, which generally includes various level 3 inputs which are not always identifiable.

[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range is presented as a percent of the initial appraised value.