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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Gross $ 3,891,064 $ 3,158,161
Non-Covered Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 12,148 999
90 or More Days Past Due 1,214 2,099
Total Past Due 13,362 3,098
Current 3,789,319 3,115,294
Loans and Leases Receivable, Gross 3,802,681 3,118,392
Total 3,803,656 3,119,154
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 10,624 334
90 or More Days Past Due 0 171
Total Past Due 10,624 505
Current 1,762,481 1,632,209
Total 1,773,105 1,632,714
Non-Covered Loans | CRE - owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 529 212
90 or More Days Past Due 0 225
Total Past Due 529 437
Current 479,752 349,711
Total 480,281 350,148
Non-Covered Loans | Commercial Real Estate Investor Owned    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 708 0
90 or More Days Past Due 0 175
Total Past Due 708 175
Current 725,705 544,633
Total 726,413 544,808
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 1,214 1,528
Total Past Due 1,214 1,883
Current 287,128 192,659
Total 288,342 194,542
Non-Covered Loans | Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 285 91
90 or More Days Past Due 0 0
Total Past Due 285 91
Current 356,130 240,669
Total 356,415 240,760
Non-Covered Loans | Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 2 7
90 or More Days Past Due 0 0
Total Past Due 2 7
Current 178,123 155,413
Loans and Leases Receivable, Gross 178,125 155,420
Total $ 179,100 $ 156,182