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Non-Covered Loans and Allowance for Non-Covered Loan Losses - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans            
Total loans $ 6,796,278   $ 6,273,669      
Allowance for loan losses (58,861)   (60,957)      
Non-covered loans, net 6,737,417   6,212,712      
Noncovered            
Loans            
Total loans 6,796,278   6,273,669      
Allowance for loan losses (58,861) $ (59,996) (60,957) $ (58,779) $ (59,208) $ (54,186)
Non-covered loans, net 6,737,417   6,212,712      
Noncovered | Commercial and industrial            
Loans            
Total loans 1,722,097   1,681,205      
Allowance for loan losses (21,821) (23,517) (23,674) (23,015) (21,834) (21,369)
Noncovered | Real estate            
Loans            
Total loans 3,381,757   3,011,524      
Allowance for loan losses (29,065) (28,584) (28,775) (27,539) (28,734) (25,236)
Noncovered | Construction and land development            
Loans            
Total loans 1,052,409   962,605      
Allowance for loan losses (7,714) (7,271) (7,844) (7,790) (7,645) (7,002)
Noncovered | Consumer            
Loans            
Total loans 46,739   40,446      
Allowance for loan losses (215) (207) (311) (369) (524) (424)
Noncovered | Broker-dealer            
Loans            
Total loans 593,276   577,889      
Allowance for loan losses $ (46) $ (417) $ (353) $ (66) $ (471) $ (155)