Fair Values of Financial Instruments, Assets, Quantitative Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended										9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Nonrecurring [Member]	Dec. 31, 2011 Nonrecurring [Member]	Sep. 30, 2012 Nonrecurring [Member] Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]	Dec. 31, 2011 Nonrecurring [Member] Quoted Prices in Active Markets For Identical Assets (Level 1) [Member]	Sep. 30, 2012 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Sep. 30, 2012 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2012 Impaired loans [Member]		Sep. 30, 2011 Impaired loans [Member]	Sep. 30, 2012 Foreclosed real estate [Member]		Sep. 30, 2011 Foreclosed real estate [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Weighted Average [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Fair Value Estimate			$ 40,644	$ 62,987	$ 0	$ 0	$ 0	$ 0	$ 40,644	$ 62,987	$ 26,843			$ 13,801
Valuation Techniques											Appraisal of collateral	[1]		Appraisal of collateral	[1],[2]
Unobservable Input											Liquidation expenses	[3]		Appraisal adjustments	[3]
Range (Weighted Average) (in hundredths)											(6.00%)						(5.00%)	(56.00%)	(20.76%)
Roll forward of level 3 assets [Abstract]
Balance, Beginning of period											43,055		52,930	19,932		20,955
Transfer to foreclosed real estate	10,938	13,603									(5,310)		(11,551)	10,938		13,603
Additions											12,965		28,977	243		504
Decrease (increase) in additional reserves											1,264		(2)	(2,819)		(3,151)
Paid off/sold											(25,131)		(21,848)	(14,493)		(12,753)
Balance, Ending of period											$ 26,843		$ 48,506	$ 13,801		$ 19,158

[1] Fair value is generally determined through independent appraisals for the underlying collateral, which generally include various level 3 inputs which are not identifiable.

[2] Includes qualitative adjustments by management and estimated liquidation expenses.

[3] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.