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Non-Covered Loans and Allowance for Non-Covered Loan Losses - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loans            
Total loans $ 6,148,813   $ 5,843,499      
Allowance for loan losses (58,779)   (54,186)      
Non-covered loans, net 6,090,034   5,789,313      
Noncovered            
Loans            
Total loans 6,148,813   5,843,499      
Allowance for loan losses (58,779) $ (59,208) (54,186) $ (52,625) $ (51,013) $ (45,415)
Non-covered loans, net 6,090,034   5,789,313      
Noncovered | Commercial and industrial            
Loans            
Total loans 1,735,468   1,696,453      
Allowance for loan losses (23,015) (21,834) (21,369) (21,438) (20,720) (19,845)
Noncovered | Real estate            
Loans            
Total loans 2,944,155   2,816,767      
Allowance for loan losses (27,539) (28,734) (25,236) (23,381) (23,302) (18,983)
Noncovered | Construction and land development            
Loans            
Total loans 941,628   786,850      
Allowance for loan losses (7,790) (7,645) (7,002) (7,111) (6,288) (6,064)
Noncovered | Consumer            
Loans            
Total loans 41,958   41,352      
Allowance for loan losses (369) (524) (424) (506) (325) (314)
Noncovered | Broker-dealer            
Loans            
Total loans 485,604   502,077      
Allowance for loan losses $ (66) $ (471) $ (155) $ (189) $ (378) $ (209)