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Portfolio Loans Covered by Loss Share (Covered loans) - Summary of Covered Loans by Category (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Covered Loans [Line Items] |  |
Recorded Investment Covered Loans | $ 158,812 | $ 201,118
Construction and Land Development |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 6.96 | 7.06
Recorded Investment Covered Loans | 15,332 | 30,537
Commercial Real Estate Investor Owned |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 6.54 | 6.08
Recorded Investment Covered Loans | 51,842 | 57,602
Commercial Real Estate Owner Occupied |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 6.87 | 6.65
Recorded Investment Covered Loans | 43,252 | 47,140
Residential Real Estate |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 5.95 | 5.68
Recorded Investment Covered Loans | 37,446 | 42,531
Real Estate Loans |  |
Covered Loans [Line Items] |  |
Recorded Investment Covered Loans | 147,872 | 177,810
Commercial & Industrial |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 6.99 | 6.57
Recorded Investment Covered Loans | 9,095 | 22,034
Consumer & Other |  |
Covered Loans [Line Items] |  |
Weighted-Average Risk Rating | 6.43 | 4.19
Recorded Investment Covered Loans | $ 1,845 | $ 1,274

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