Fair Value Measurements Fair Value Measurements, Financial Instruments, Qualitative Disclosures Related to Election (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Commercial [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.25%	0.25%	0.25%
Contractual Yield Range, Maximum (in hundredths)	30.00%	18.00%	30.00%
Average Re-pricing (in years)	0.70	0.60	0.57
Discount Rate Range, Minimum (in hundredths)	0.58%	0.72%	0.63%
Discount Rate Range, Maximum (in hundredths)	3.92%	4.50%	3.85%
Commercial Real Estate [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.38%	0.38%	0.38%
Contractual Yield Range, Maximum (in hundredths)	18.00%	18.00%	18.00%
Average Re-pricing (in years)	0.92	1.18	1.26
Discount Rate Range, Minimum (in hundredths)	0.29%	0.28%	0.28%
Discount Rate Range, Maximum (in hundredths)	3.45%	3.66%	3.51%
Residential Mortgage [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.38%	0.38%	0.38%
Contractual Yield Range, Maximum (in hundredths)	18.00%	18.00%	18.00%
Average Re-pricing (in years)	3.10	3.32	3.26
Discount Rate Range, Minimum (in hundredths)	1.06%	0.74%	1.14%
Discount Rate Range, Maximum (in hundredths)	3.86%	4.31%	3.70%
Consumer [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.38%	0.38%	0.38%
Contractual Yield Range, Maximum (in hundredths)	21.00%	21.00%	21.00%
Average Re-pricing (in years)	0.34	0.53	0.42
Discount Rate Range, Minimum (in hundredths)	1.73%	1.96%	1.88%
Discount Rate Range, Maximum (in hundredths)	3.78%	3.74%	3.88%
Time Deposits [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.01%	0.01%	0.01%
Contractual Yield Range, Maximum (in hundredths)	9.64%	9.64%	9.64%
Average Re-pricing (in years)	2.17	1.91	2.07
Discount Rate Range, Minimum (in hundredths)	0.94%	0.76%	1.02%
Discount Rate Range, Maximum (in hundredths)	1.44%	1.45%	1.43%
Other Borrowings [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	0.25%	0.07%	0.25%
Contractual Yield Range, Maximum (in hundredths)	5.25%	6.58%	6.58%
Average Re-pricing (in years)	0.00	0.00	0.00
Discount Rate Range, Minimum (in hundredths)	0.09%	0.07%	0.04%
Discount Rate Range, Maximum (in hundredths)	2.70%	2.65%	2.76%
Subordinated Debentures [Member]
Fair Value of Financial Instruments Other Disclosures [Abstract]
Contractual Yield Range, Minimum (in hundredths)	1.16%	5.19%	5.19%
Contractual Yield Range, Maximum (in hundredths)	5.00%	5.82%	5.82%
Average Re-pricing (in years)	4.02	1.87	1.44
Discount Rate Range, Maximum (in hundredths)	2.40%	3.50%	3.29%