Fair Value of Financial Instruments, Roll Forward of Level 3 Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Roll forward of level 3 assets [Abstract]
Transfer of net loans to foreclosed real estate	$ 13,248		$ 16,295	[1]	$ 24,137	[1]
Impaired Loans [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Fair Value Estimate	44,234
Valuation Techniques	Appraisal of collateral	[2]
Unobservable Input	Liquidation expenses	[3]
Range and weighted average of liquidation expenses (in hundredths)	(6.00%)
Roll forward of level 3 assets [Abstract]
Balance, Beginning of period	43,055		52,930		50,403
Transfer of net loans to foreclosed real estate	(6,868)		(14,155)		(26,526)
Additions	42,193		40,029		59,212
(Increase) decrease in additional reserves	5,401		1,545		944
Paid off/sold	(39,547)		(37,294)		(31,103)
Balance, Ending of period	44,234		43,055		52,930
Foreclosed Real Estate [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Fair Value Estimate	11,441
Valuation Techniques	Appraisal of collateral	[2],[4]
Unobservable Input	Appraisal adjustments	[3]
Roll forward of level 3 assets [Abstract]
Balance, Beginning of period	19,932		20,955		21,574
Transfer of net loans to foreclosed real estate	13,248		16,295		24,137
Additions	374		502		430
(Increase) decrease in additional reserves	(3,284)		(3,562)		(3,451)
Paid off/sold	(18,829)		(14,258)		(21,735)
Balance, Ending of period	$ 11,441		$ 19,932		$ 20,955
Minimum [Member] | Foreclosed Real Estate [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Range and weighted average of appraisal adjustments (in hundredths)	(5.03%)
Maximum [Member] | Foreclosed Real Estate [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Range and weighted average of appraisal adjustments (in hundredths)	(74.68%)
Weighted Average [Member] | Foreclosed Real Estate [Member]
Quantitative Information about Level 3 Fair Value Measurements [Abstract]
Range and weighted average of appraisal adjustments (in hundredths)	(24.37%)

[1] Restated

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

[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.

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