Non-Covered Loans and Allowance for Non-Covered Loan Losses - Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Loans
Total loans	$ 5,366,065	$ 5,220,040
Allowance for loan losses	(48,450)	(45,415)
Non-covered loans, net	5,317,615	5,174,625
Noncovered
Loans
Total loans	5,366,065	5,220,040
Allowance for loan losses	(48,450)	(45,415)	$ (39,365)	$ (37,041)
Non-covered loans, net	5,317,615	5,174,625
Noncovered \| Commercial and industrial
Loans
Total loans	1,619,567	1,552,805
Allowance for loan losses	(20,169)	(19,845)	(20,153)	(18,833)
Noncovered \| Real estate
Loans
Total loans	2,536,302	2,313,239
Allowance for loan losses	(22,272)	(18,983)	(12,704)	(11,131)
Noncovered \| Construction and land development
Loans
Total loans	701,358	705,356
Allowance for loan losses	(5,561)	(6,064)	(5,842)	(6,450)
Noncovered \| Consumer
Loans
Total loans	44,851	45,672
Allowance for loan losses	(334)	(314)	(176)	(461)
Noncovered \| Broker-dealer
Loans
Total loans	463,987	602,968
Allowance for loan losses	$ (114)	$ (209)	$ (490)	$ (166)

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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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