Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Allowance for Loan Losses for Non-covered Loans by Portfolio Class and Category (Details) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Allowance for Loan Losses [Roll Forward]
Balance	$ 27,289
Provision charged to expense	1,027
Losses charged off	(1,369)
Recoveries	958
Balance	27,905
Commercial & Industrial
Allowance for Loan Losses [Roll Forward]
Balance	12,246
Provision charged to expense	899
Losses charged off	(474)
Recoveries	187
Balance	12,858
Commercial Real Estate Owner Occupied
Allowance for Loan Losses [Roll Forward]
Balance	4,096
Provision charged to expense	589
Losses charged off	(336)
Recoveries	8
Balance	4,357
Commercial Real Estate Investor Owned
Allowance for Loan Losses [Roll Forward]
Balance	6,600
Provision charged to expense	(9)
Losses charged off	(250)
Recoveries	34
Balance	6,375
Construction and Land Development
Allowance for Loan Losses [Roll Forward]
Balance	2,136
Provision charged to expense	(532)
Losses charged off	(305)
Recoveries	688
Balance	1,987
Residential Real Estate
Allowance for Loan Losses [Roll Forward]
Balance	2,019
Provision charged to expense	16
Losses charged off	0
Recoveries	41
Balance	2,076
Consumer & Other
Allowance for Loan Losses [Roll Forward]
Balance	192
Provision charged to expense	64
Losses charged off	(4)
Recoveries	0
Balance	$ 252