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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
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Gross $ 4,030,658 $ 3,158,161
Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 12,426 999
90 or More Days Past Due 1,274 2,099
Total Past Due 13,700 3,098
Current 3,934,976 3,115,294
Loans and Leases Receivable, Gross 3,948,676 3,118,392
Total 3,949,856 3,119,154
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 9,147 334
90 or More Days Past Due 283 171
Total Past Due 9,430 505
Current 1,851,855 1,632,209
Total 1,861,285 1,632,714
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 266 212
90 or More Days Past Due 0 225
Total Past Due 266 437
Current 553,246 349,711
Total 553,512 350,148
Non-Covered Loans | Commercial Real Estate Investor Owned    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 986 0
90 or More Days Past Due 0 175
Total Past Due 986 175
Current 737,000 544,633
Total 737,986 544,808
Non-Covered Loans | Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 0 355
90 or More Days Past Due 323 1,528
Total Past Due 323 1,883
Current 301,859 192,659
Total 302,182 194,542
Non-Covered Loans | Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 485 91
90 or More Days Past Due 668 0
Total Past Due 1,153 91
Current 338,224 240,669
Total 339,377 240,760
Non-Covered Loans | Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 1,542 7
90 or More Days Past Due 0 0
Total Past Due 1,542 7
Current 152,792 155,413
Loans and Leases Receivable, Gross 154,334 155,420
Total $ 155,514 $ 156,182