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Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Gross $ 4,190,845 $ 4,097,050
Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 5,512 10,828
90 or More Days Past Due 6,501 2,715
Total Past Due 12,013 13,543
Current 4,112,226 4,009,353
Loans and Leases Receivable, Gross 4,124,239 4,022,896
Total 4,125,153 4,024,221
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 3,669 7,882
90 or More Days Past Due 5,150 1,770
Total Past Due 8,819 9,652
Current 1,972,865 1,909,068
Total 1,981,684 1,918,720
Non-Covered Loans | CRE - investor owned    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 0 934
90 or More Days Past Due 0 0
Total Past Due 0 934
Current 811,244 768,341
Total 811,244 769,275
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 945 0
90 or More Days Past Due 0 0
Total Past Due 945 0
Current 567,828 554,589
Total 568,773 554,589
Non-Covered Loans | Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 497 76
90 or More Days Past Due 0 0
Total Past Due 497 76
Current 306,327 303,015
Total 306,824 303,091
Non-Covered Loans | Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 401 1,529
90 or More Days Past Due 1,026 945
Total Past Due 1,427 2,474
Current 326,765 338,838
Total 328,192 341,312
Non-Covered Loans | Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 0 407
90 or More Days Past Due 325 0
Total Past Due 325 407
Current 127,197 135,502
Loans and Leases Receivable, Gross 127,522 135,909
Total $ 128,436 $ 137,234