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Non-Covered Loans and Allowance for Non-Covered Loan Losses - Summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans            
Total loans $ 6,384,660   $ 6,273,669      
Allowance for loan losses (59,996)   (60,957)      
Non-covered loans, net 6,324,664   6,212,712      
Noncovered            
Loans            
Total loans 6,384,660   6,273,669      
Allowance for loan losses (59,996) $ (60,371) (60,957) $ (59,208) $ (55,157) $ (54,186)
Non-covered loans, net 6,324,664   6,212,712      
Noncovered | Commercial and industrial            
Loans            
Total loans 1,655,431   1,681,205      
Allowance for loan losses (23,517) (23,269) (23,674) (21,834) (21,679) (21,369)
Noncovered | Real estate            
Loans            
Total loans 3,142,496   3,011,524      
Allowance for loan losses (28,584) (29,300) (28,775) (28,734) (26,112) (25,236)
Noncovered | Construction and land development            
Loans            
Total loans 948,309   962,605      
Allowance for loan losses (7,271) (7,449) (7,844) (7,645) (6,879) (7,002)
Noncovered | Consumer            
Loans            
Total loans 38,262   40,446      
Allowance for loan losses (207) (276) (311) (524) (464) (424)
Noncovered | Broker-dealer            
Loans            
Total loans 600,162   577,889      
Allowance for loan losses $ (417) $ (77) $ (353) $ (471) $ (23) $ (155)