Non-Covered Loans and Allowance for Non-Covered Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified			10 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 20, 2013 Bank item	Sep. 30, 2013 Non-covered loans	Dec. 31, 2012 Non-covered loans	Sep. 30, 2013 Non-covered loans Bank	Dec. 31, 2012 Non-covered loans Bank	Sep. 30, 2013 Non-covered loans Pass	Dec. 31, 2012 Non-covered loans Pass	Sep. 30, 2013 Non-covered loans Special Mention	Dec. 31, 2012 Non-covered loans Special Mention	Sep. 30, 2013 Non-covered loans Substandard	Dec. 31, 2012 Non-covered loans Substandard	Sep. 30, 2013 Non-covered loans Secured	Dec. 31, 2012 Non-covered loans Secured	Sep. 30, 2013 Non-covered loans Secured Bank	Dec. 31, 2012 Non-covered loans Secured Bank	Sep. 30, 2013 Non-covered loans Secured Pass	Dec. 31, 2012 Non-covered loans Secured Pass	Sep. 30, 2013 Non-covered loans Secured Special Mention	Dec. 31, 2012 Non-covered loans Secured Special Mention	Sep. 30, 2013 Non-covered loans Secured Substandard	Dec. 31, 2012 Non-covered loans Secured Substandard	Sep. 30, 2013 Non-covered loans Unsecured	Dec. 31, 2012 Non-covered loans Unsecured	Sep. 30, 2013 Non-covered loans Unsecured Bank	Dec. 31, 2012 Non-covered loans Unsecured Bank	Sep. 30, 2013 Non-covered loans Unsecured Pass	Dec. 31, 2012 Non-covered loans Unsecured Pass	Sep. 30, 2013 Non-covered loans Unsecured Special Mention	Dec. 31, 2012 Non-covered loans Unsecured Special Mention	Sep. 30, 2013 Non-covered loans Unsecured Substandard	Sep. 30, 2013 Non-covered loans Secured by commercial properties	Dec. 31, 2012 Non-covered loans Secured by commercial properties	Sep. 30, 2013 Non-covered loans Secured by commercial properties Bank	Dec. 31, 2012 Non-covered loans Secured by commercial properties Bank	Sep. 30, 2013 Non-covered loans Secured by commercial properties Pass	Dec. 31, 2012 Non-covered loans Secured by commercial properties Pass	Sep. 30, 2013 Non-covered loans Secured by commercial properties Special Mention	Sep. 30, 2013 Non-covered loans Secured by commercial properties Substandard	Sep. 30, 2013 Non-covered loans Secured by residential properties	Dec. 31, 2012 Non-covered loans Secured by residential properties	Sep. 30, 2013 Non-covered loans Secured by residential properties Bank	Dec. 31, 2012 Non-covered loans Secured by residential properties Bank	Sep. 30, 2013 Non-covered loans Secured by residential properties Pass	Dec. 31, 2012 Non-covered loans Secured by residential properties Pass	Sep. 30, 2013 Non-covered loans Secured by residential properties Substandard	Sep. 30, 2013 Non-covered loans Residential construction loan	Dec. 31, 2012 Non-covered loans Residential construction loan	Sep. 30, 2013 Non-covered loans Residential construction loan Bank	Dec. 31, 2012 Non-covered loans Residential construction loan Bank	Sep. 30, 2013 Non-covered loans Residential construction loan Pass	Dec. 31, 2012 Non-covered loans Residential construction loan Pass	Sep. 30, 2013 Non-covered loans Commercial construction loans and land development	Dec. 31, 2012 Non-covered loans Commercial construction loans and land development	Sep. 30, 2013 Non-covered loans Commercial construction loans and land development Bank	Dec. 31, 2012 Non-covered loans Commercial construction loans and land development Bank	Sep. 30, 2013 Non-covered loans Commercial construction loans and land development Pass	Dec. 31, 2012 Non-covered loans Commercial construction loans and land development Pass	Sep. 30, 2013 Non-covered loans Commercial construction loans and land development Special Mention	Sep. 30, 2013 Non-covered loans Commercial construction loans and land development Substandard	Sep. 30, 2013 Non-covered loans Consumer	Dec. 31, 2012 Non-covered loans Consumer	Sep. 30, 2013 Non-covered loans Consumer Bank	Dec. 31, 2012 Non-covered loans Consumer Bank	Sep. 30, 2013 Non-covered loans Consumer Pass	Dec. 31, 2012 Non-covered loans Consumer Pass	Sep. 30, 2013 Non-covered loans Consumer Special Mention	Sep. 30, 2013 Non-covered loans Consumer Substandard	Sep. 30, 2013 Non-covered loans PCI loans	Dec. 31, 2012 Non-covered loans PCI loans	Sep. 30, 2013 Non-covered loans PCI loans Bank	Dec. 31, 2012 Non-covered loans PCI loans Bank	Sep. 30, 2013 Non-covered loans PCI loans Secured	Dec. 31, 2012 Non-covered loans PCI loans Secured	Sep. 30, 2013 Non-covered loans PCI loans Secured Bank	Dec. 31, 2012 Non-covered loans PCI loans Secured Bank	Sep. 30, 2013 Non-covered loans PCI loans Unsecured	Dec. 31, 2012 Non-covered loans PCI loans Unsecured	Sep. 30, 2013 Non-covered loans PCI loans Unsecured Bank	Dec. 31, 2012 Non-covered loans PCI loans Unsecured Bank	Sep. 30, 2013 Non-covered loans PCI loans Secured by commercial properties	Dec. 31, 2012 Non-covered loans PCI loans Secured by commercial properties	Sep. 30, 2013 Non-covered loans PCI loans Secured by commercial properties Bank	Dec. 31, 2012 Non-covered loans PCI loans Secured by commercial properties Bank	Sep. 30, 2013 Non-covered loans PCI loans Secured by residential properties	Dec. 31, 2012 Non-covered loans PCI loans Secured by residential properties	Sep. 30, 2013 Non-covered loans PCI loans Secured by residential properties Bank	Dec. 31, 2012 Non-covered loans PCI loans Secured by residential properties Bank	Dec. 31, 2012 Non-covered loans PCI loans Residential construction loan	Dec. 31, 2012 Non-covered loans PCI loans Residential construction loan Bank	Sep. 30, 2013 Non-covered loans PCI loans Commercial construction loans and land development	Dec. 31, 2012 Non-covered loans PCI loans Commercial construction loans and land development	Sep. 30, 2013 Non-covered loans PCI loans Commercial construction loans and land development Bank	Dec. 31, 2012 Non-covered loans PCI loans Commercial construction loans and land development Bank	Sep. 30, 2013 Non-covered loans PCI loans Consumer	Dec. 31, 2012 Non-covered loans PCI loans Consumer	Sep. 30, 2013 Non-covered loans PCI loans Consumer Bank	Dec. 31, 2012 Non-covered loans PCI loans Consumer Bank
Internal risk grades of non-covered loans
Total	$ 3,310,224	$ 3,152,396		$ 3,310,224	$ 3,152,396	$ 3,310,224	$ 3,152,396	$ 3,140,093	$ 2,978,271	$ 7,693	$ 2,715	$ 23,214	$ 4,630	$ 1,512,130	$ 1,551,532	$ 1,512,130	$ 1,551,532	$ 1,430,645	$ 1,476,420	$ 6,269	$ 2,515	$ 18,385	$ 4,630	$ 113,292	$ 108,761	$ 113,292	$ 108,761	$ 111,381	$ 105,142	$ 13	$ 200	$ 222	$ 1,046,673	$ 924,303	$ 1,046,673	$ 924,303	$ 1,003,771	$ 868,784	$ 505	$ 320	$ 275,381	$ 260,611	$ 275,381	$ 260,611	$ 266,949	$ 253,883	$ 3,796	$ 57,205	$ 48,169	$ 57,205	$ 48,169	$ 57,205	$ 47,461	$ 253,187	$ 232,314	$ 253,187	$ 232,314	$ 227,192	$ 199,952	$ 874	$ 480	$ 52,356	$ 26,706	$ 52,356	$ 26,706	$ 42,950	$ 26,629	$ 32	$ 11	$ 139,224	$ 166,780	$ 139,224	$ 166,780	$ 56,831	$ 67,967	$ 56,831	$ 67,967	$ 1,676	$ 3,419	$ 1,676	$ 3,419	$ 42,077	$ 55,519	$ 42,077	$ 55,519	$ 4,636	$ 6,728	$ 4,636	$ 6,728	$ 708	$ 708	$ 24,641	$ 32,362	$ 24,641	$ 32,362	$ 9,363	$ 77	$ 9,363	$ 77
Number of types of loans			2