Non-Covered Loans and Allowance for Non-Covered Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	$ 3,310,224	$ 3,152,396
Non-covered loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	3,310,224	3,152,396
Non-covered loans | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	139,224	166,780
Non-covered loans | Secured
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	1,512,130	1,551,532
Non-covered loans | Secured | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	56,831	67,967
Non-covered loans | Unsecured
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	113,292	108,761
Non-covered loans | Unsecured | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	1,676	3,419
Non-covered loans | Secured by commercial properties
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	1,046,673	924,303
Non-covered loans | Secured by commercial properties | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	42,077	55,519
Non-covered loans | Secured by residential properties
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	275,381	260,611
Non-covered loans | Secured by residential properties | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	4,636	6,728
Non-covered loans | Residential construction loan
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	57,205	48,169
Non-covered loans | Residential construction loan | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans		708
Non-covered loans | Commercial construction loans and land development
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	253,187	232,314
Non-covered loans | Commercial construction loans and land development | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	24,641	32,362
Non-covered loans | Consumer
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	52,356	26,706
Non-covered loans | Consumer | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	9,363	77
Non-covered loans | Bank
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days	2,373	9,463
Loans past Due 60-89 Days	2,689	449
Loans past Due 90 Days or More	1,428	2,131
Total Past Due Loans	6,490	12,043
Current Loans	3,164,510	2,973,573
Total loans	3,310,224	3,152,396
Accruing Loans Past Due 90 Days or More	1,128	2,000
Non-covered loans | Bank | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	139,224	166,780
Non-covered loans | Bank | Secured
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days	1,099	7,844
Loans past Due 60-89 Days	1,065	348
Loans past Due 90 Days or More	1,395	2,131
Total Past Due Loans	3,559	10,323
Current Loans	1,451,740	1,473,242
Total loans	1,512,130	1,551,532
Accruing Loans Past Due 90 Days or More	1,118	2,000
Non-covered loans | Bank | Secured | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	56,831	67,967
Non-covered loans | Bank | Unsecured
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days	475	3
Loans past Due 60-89 Days	1,339
Loans past Due 90 Days or More	23
Total Past Due Loans	1,837	3
Current Loans	109,779	105,339
Total loans	113,292	108,761
Non-covered loans | Bank | Unsecured | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	1,676	3,419
Non-covered loans | Bank | Secured by commercial properties
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days		714
Loans past Due 60-89 Days	132
Total Past Due Loans	132	714
Current Loans	1,004,464	868,070
Total loans	1,046,673	924,303
Non-covered loans | Bank | Secured by commercial properties | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	42,077	55,519
Non-covered loans | Bank | Secured by residential properties
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days	698	755
Loans past Due 60-89 Days	20	101
Total Past Due Loans	718	856
Current Loans	270,027	253,027
Total loans	275,381	260,611
Non-covered loans | Bank | Secured by residential properties | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	4,636	6,728
Non-covered loans | Bank | Residential construction loan
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Current Loans	57,205	47,461
Total loans	57,205	48,169
Non-covered loans | Bank | Residential construction loan | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans		708
Non-covered loans | Bank | Commercial construction loans and land development
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days		63
Loans past Due 60-89 Days	112
Total Past Due Loans	112	63
Current Loans	228,434	199,889
Total loans	253,187	232,314
Non-covered loans | Bank | Commercial construction loans and land development | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	24,641	32,362
Non-covered loans | Bank | Consumer
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans past Due 30-59 Days	101	84
Loans past Due 60-89 Days	21
Loans past Due 90 Days or More	10
Total Past Due Loans	132	84
Current Loans	42,861	26,545
Total loans	52,356	26,706
Accruing Loans Past Due 90 Days or More	10
Non-covered loans | Bank | Consumer | PCI loans
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Total loans	$ 9,363	$ 77