Fair Value (Valuation Techniques) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Mortgage interest rate lock agreements | Discounted cash flow
Fair Value Inputs [Abstract]
Pull through rates	85.00%
Mortgage interest rate lock agreements | Discounted cash flow | Weighted Average
Fair Value Inputs [Abstract]
Pull through rates	85.00%
Mortgage forward sale agreements | Consensus pricing
Fair Value Inputs [Abstract]
Pull through rates	85.00%
Mortgage forward sale agreements | Consensus pricing | Weighted Average
Fair Value Inputs [Abstract]
Pull through rates	85.00%
Interest rate swap | Discounted cash flow | Minimum
Fair Value Inputs [Abstract]
Discount rate	0.31%
Interest rate swap | Discounted cash flow | Maximum
Fair Value Inputs [Abstract]
Discount rate	0.85%
Interest rate swap | Discounted cash flow | Weighted Average
Fair Value Inputs [Abstract]
Discount rate	0.50%
Collateralized debt obligations | Discounted cash flow | Minimum
Fair Value Inputs [Abstract]
Discount rate	15.00%
Default rates	0.25%
Collateralized debt obligations | Discounted cash flow | Maximum
Fair Value Inputs [Abstract]
Discount rate	25.00%
Default rates	1.20%
Collateralized debt obligations | Discounted cash flow | Weighted Average
Fair Value Inputs [Abstract]
Discount rate	18.15%
Default rates	0.57%
Impaired loans | Consensus pricing | Minimum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	2,000
Impaired loans | Consensus pricing | Maximum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	490,000
Impaired loans | Consensus pricing | Weighted Average
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	60,000
Loan foreclosures | Consensus pricing | Minimum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	1,000
Loan foreclosures | Consensus pricing | Maximum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	91,000
Loan foreclosures | Consensus pricing | Weighted Average
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	24,000
Other real estate | Consensus pricing | Minimum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	1,000
Other real estate | Consensus pricing | Maximum
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	526,000
Other real estate | Consensus pricing | Weighted Average
Fair Value Inputs [Abstract]
Adjustments for market conditions since appraisal	95,000
Level 3 | Mortgage interest rate lock agreements | Discounted cash flow
Fair Value Inputs [Abstract]
Assets, Fair Value	665
Level 3 | Mortgage forward sale agreements | Consensus pricing
Fair Value Inputs [Abstract]
Liabilities, Fair Value	(304)
Level 3 | Interest rate swap | Discounted cash flow
Fair Value Inputs [Abstract]
Liabilities, Fair Value	(2,653)
Level 3 | Collateralized debt obligations | Discounted cash flow
Fair Value Inputs [Abstract]
Assets, Fair Value	855
Nonrecurring | Level 3 | Impaired loans | Consensus pricing
Fair Value Inputs [Abstract]
Assets, Fair Value	21,243
Nonrecurring | Level 3 | Loan foreclosures | Consensus pricing
Fair Value Inputs [Abstract]
Assets, Fair Value	1,901
Nonrecurring | Level 3 | Other real estate | Consensus pricing
Fair Value Inputs [Abstract]
Assets, Fair Value	7,503