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
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

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

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