Non-Covered Loans and Allowance for Non-Covered Loan Losses - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans
Total loans	$ 5,220,040	$ 3,920,476
Allowance for loan losses	(45,415)	(37,041)
Non-covered loans, net	5,174,625	3,883,435
Noncovered
Loans
Total loans	5,220,040	3,920,476
Allowance for loan losses	(45,415)	(37,041)	$ (33,241)	$ (3,409)
Non-covered loans, net	5,174,625	3,883,435
Noncovered \| Commercial and industrial
Loans
Total loans	2,155,773	1,758,851
Allowance for loan losses	(20,054)	(18,999)	(16,865)	(1,845)
Margin loans to customers and correspondents	602,800	378,400
Noncovered \| Real estate
Loans
Total loans	2,313,239	1,694,835
Allowance for loan losses	(18,983)	(11,131)	(8,331)	(977)
Noncovered \| Construction and land development
Loans
Total loans	705,356	413,643
Allowance for loan losses	(6,064)	(6,450)	(7,957)	(582)
Noncovered \| Consumer
Loans
Total loans	45,672	53,147
Allowance for loan losses	$ (314)	$ (461)	$ (88)	$ (5)

Represents the amount of margin loans to customers and correspondents included in the portfolio segment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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