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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
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   $ 44,555       $ 43,476
Loans - Ending balance:            
Loans and Leases Receivable, Gross   $ 5,228,014       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 1 3 1      
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 187 $ 520 $ 187      
Financing Receivable, Troubled Debt Restructuring, Premodification $ 187 520 $ 187      
Individually evaluated for impairment   2,408       4,453
Collectively evaluated for impairment   41,290       37,842
Total   43,698   $ 42,935 $ 41,945 42,295
Loans - Ending balance:            
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums   (2,346)       (2,026)
Individually evaluated for impairment   16,771       18,071
Collectively evaluated for impairment   5,115,620       4,285,529
Total   5,134,737       4,305,626
Loans and Leases Receivable, Gross   $ 5,132,391       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 0 1      
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 187 $ 0 $ 187      
Financing Receivable, Troubled Debt Restructuring, Premodification $ 187 0 $ 187      
Individually evaluated for impairment   2,023       4,266
Collectively evaluated for impairment   26,851       24,773
Total   28,874   29,093 28,660 29,039
Loans - Ending balance:            
Individually evaluated for impairment   11,433       12,950
Collectively evaluated for impairment   2,276,289       2,108,058
Total   2,287,722       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   258       0
Collectively evaluated for impairment   5,410       4,683
Total   5,668   5,324 5,339 4,683
Loans - Ending balance:            
Individually evaluated for impairment   2,637       398
Collectively evaluated for impairment   1,245,054       843,330
Total   $ 1,247,691       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]            
Financing Receivable, Modifications, Number of Contracts | loan   1 0      
Financing Receivable, Troubled Debt Restructuring, Postmodification   $ 188 $ 0      
Financing Receivable, Troubled Debt Restructuring, Premodification   188 $ 0      
Individually evaluated for impairment   0       109
Collectively evaluated for impairment   4,771       4,130
Total   4,771   4,371 3,774 4,239
Loans - Ending balance:            
Individually evaluated for impairment   1,423       2,135
Collectively evaluated for impairment   659,010       602,363
Total   660,433       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   2,144       1,987
Total   2,144   1,972 1,699 1,987
Loans - Ending balance:            
Individually evaluated for impairment   0       0
Collectively evaluated for impairment   425,639       330,097
Total   $ 425,639       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 0      
Financing Receivable, Troubled Debt Restructuring, Postmodification   $ 332 $ 0      
Financing Receivable, Troubled Debt Restructuring, Premodification   332 $ 0      
Individually evaluated for impairment   116       52
Collectively evaluated for impairment   1,265       1,564
Total   1,381   1,378 1,625 1,616
Loans - Ending balance:            
Individually evaluated for impairment   1,267       2,277
Collectively evaluated for impairment   372,895       296,667
Total   374,162       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   11       26
Collectively evaluated for impairment   849       705
Total   860   $ 797 $ 848 731
Loans - Ending balance:            
Individually evaluated for impairment   11       311
Collectively evaluated for impairment   136,733       105,014
Total   139,090       107,351
Loans and Leases Receivable, Gross   $ 136,744       $ 105,325