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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, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Gross $ 5,017,077 $ 4,350,001
Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 27,882 1,602
90 or More Days Past Due 7,900 12,158
Total Past Due 35,782 13,760
Current 4,858,792 4,289,840
Loans and Leases Receivable, Gross 4,894,574 4,303,600
Total 4,896,486 4,305,626
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 22,062 66
90 or More Days Past Due 5,816 10,257
Total Past Due 27,878 10,323
Current 2,181,559 2,110,685
Total 2,209,437 2,121,008
Non-Covered Loans | CRE - investor owned    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 0 529
90 or More Days Past Due 1,527 127
Total Past Due 1,527 656
Current 1,143,341 843,072
Total 1,144,868 843,728
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 708 292
90 or More Days Past Due 229 565
Total Past Due 937 857
Current 646,261 603,641
Total 647,198 604,498
Non-Covered Loans | Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 98 6
90 or More Days Past Due 0 0
Total Past Due 98 6
Current 358,786 330,091
Total 358,884 330,097
Non-Covered Loans | Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 4,945 709
90 or More Days Past Due 328 897
Total Past Due 5,273 1,606
Current 411,458 297,338
Total 416,731 298,944
Non-Covered Loans | Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 69 0
90 or More Days Past Due 0 312
Total Past Due 69 312
Current 117,387 105,013
Loans and Leases Receivable, Gross 117,456 105,325
Total $ 119,368 $ 107,351