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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 ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]              
Total          
Loans - Ending balance:              
Loans and Leases Receivable, Gross $ 4,267,430   $ 4,267,430       $ 4,097,050
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 0 1 1      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 187 $ 0 $ 187 $ 676      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 187 $ 0 187 $ 676      
Individually evaluated for impairment 4,314   4,314       2,579
Collectively evaluated for impairment 37,578   37,578       35,587
Total 41,892   41,892   $ 42,007 $ 40,263 38,166
Loans - Ending balance:              
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,348)   (1,348)       (1,325)
Individually evaluated for impairment 18,411   18,411       17,175
Collectively evaluated for impairment 4,199,930   4,199,930       4,005,721
Total 4,219,689   4,219,689       4,024,221
Loans and Leases Receivable, Gross $ 4,218,341   $ 4,218,341       4,022,896
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, Modifications, Post-Modification Recorded Investment $ 187 $ 0          
Financing Receivable, Modifications, Pre-Modification Recorded Investment 187 $ 0          
Individually evaluated for impairment 4,128   $ 4,128       2,508
Collectively evaluated for impairment 25,462   25,462       23,898
Total 29,590   29,590   29,424 27,410 26,406
Loans - Ending balance:              
Individually evaluated for impairment 12,197   12,197       12,665
Collectively evaluated for impairment 2,020,732   2,020,732       1,906,055
Total 2,032,929   2,032,929       1,918,720
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 0   0       0
Collectively evaluated for impairment 4,572   4,572       3,890
Total 4,572   4,572   4,561 4,546 3,890
Loans - Ending balance:              
Individually evaluated for impairment 770   770       422
Collectively evaluated for impairment 825,677   825,677       768,853
Total 826,447   826,447       769,275
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 177   177       71
Collectively evaluated for impairment 3,453   3,453       3,237
Total 3,630   3,630   3,845 3,502 3,308
Loans - Ending balance:              
Individually evaluated for impairment 2,655   2,655       1,975
Collectively evaluated for impairment 586,390   586,390       552,614
Total 589,045   589,045       554,589
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       0
Collectively evaluated for impairment 1,865   1,865       1,487
Total 1,865   1,865   1,690 1,728 1,487
Loans - Ending balance:              
Individually evaluated for impairment 0   0       136
Collectively evaluated for impairment 326,858   326,858       302,955
Total 326,858   326,858       303,091
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]              
Individually evaluated for impairment 9   9       0
Collectively evaluated for impairment 1,533   1,533       2,237
Total 1,542   1,542   1,763 2,315 2,237
Loans - Ending balance:              
Individually evaluated for impairment 2,477   2,477       1,602
Collectively evaluated for impairment 305,908   305,908       339,710
Total 308,385   308,385       341,312
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   0       0
Collectively evaluated for impairment 693   693       838
Total 693   693   $ 724 $ 762 838
Loans - Ending balance:              
Individually evaluated for impairment 312   312       375
Collectively evaluated for impairment 134,365   134,365       135,534
Total 136,025   136,025       137,234
Loans and Leases Receivable, Gross $ 134,677   $ 134,677       $ 135,909