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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
loan
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Total $ 43,822   $ 43,476
Loans - Ending balance:      
Loans and Leases Receivable, Gross $ 5,149,497   4,350,001
Portfolio loans, net      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Financing Receivable, Modifications, Number of Contracts | loan 3    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 520    
Financing Receivable, Troubled Debt Restructuring, Premodification 520    
Individually evaluated for impairment 2,599   4,453
Collectively evaluated for impairment 40,336   37,842
Total 42,935 $ 41,945 42,295
Loans - Ending balance:      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,982)   (2,026)
Individually evaluated for impairment 21,085   18,071
Collectively evaluated for impairment 5,025,097   4,285,529
Total 5,048,164   4,305,626
Loans and Leases Receivable, Gross $ 5,046,182   4,303,600
Portfolio loans, net | Commercial and industrial      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Financing Receivable, Modifications, Number of Contracts | loan 1    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 188    
Financing Receivable, Troubled Debt Restructuring, Premodification 188    
Individually evaluated for impairment 2,402   4,266
Collectively evaluated for impairment 26,691   24,773
Total 29,093 28,660 29,039
Loans - Ending balance:      
Individually evaluated for impairment 15,112   12,950
Collectively evaluated for impairment 2,233,459   2,108,058
Total 2,248,571   2,121,008
Portfolio loans, net | CRE - investor owned      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Individually evaluated for impairment 165   0
Collectively evaluated for impairment 5,159   4,683
Total 5,324 5,339 4,683
Loans - Ending balance:      
Individually evaluated for impairment 1,284   398
Collectively evaluated for impairment 1,197,024   843,330
Total 1,198,308   843,728
Portfolio loans, net | CRE - owner occupied      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Individually evaluated for impairment 9   109
Collectively evaluated for impairment 4,362   4,130
Total 4,371 3,774 4,239
Loans - Ending balance:      
Individually evaluated for impairment 1,629   2,135
Collectively evaluated for impairment 676,417   602,363
Total 678,046   604,498
Portfolio loans, net | Construction and land development      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 1,972   1,987
Total 1,972 1,699 1,987
Loans - Ending balance:      
Individually evaluated for impairment 0   0
Collectively evaluated for impairment 396,370   330,097
Total $ 396,370   330,097
Portfolio loans, net | Residential real estate      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Financing Receivable, Modifications, Number of Contracts | loan 2    
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 332    
Financing Receivable, Troubled Debt Restructuring, Premodification 332    
Individually evaluated for impairment 23   52
Collectively evaluated for impairment 1,355   1,564
Total 1,378 1,625 1,616
Loans - Ending balance:      
Individually evaluated for impairment 3,060   2,277
Collectively evaluated for impairment 392,768   296,667
Total 395,828   298,944
Portfolio loans, net | Consumer and other      
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]      
Individually evaluated for impairment 0   26
Collectively evaluated for impairment 797   705
Total 797 $ 848 731
Loans - Ending balance:      
Individually evaluated for impairment 0   311
Collectively evaluated for impairment 129,059   105,014
Total 131,041   107,351
Loans and Leases Receivable, Gross $ 129,059   $ 105,325