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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Loans - Ending balance:    
Loans and Leases Receivable, Gross $ 4,190,845 $ 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]    
Individually evaluated for impairment 2,893 2,579
Collectively evaluated for impairment 37,370 35,587
Total 40,263 38,166
Loans - Ending balance:    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (914) (1,325)
Individually evaluated for impairment 17,029 17,175
Collectively evaluated for impairment 4,107,210 4,005,721
Total 4,125,153 4,024,221
Loans and Leases Receivable, Gross 4,124,239 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]    
Individually evaluated for impairment 2,794 2,508
Collectively evaluated for impairment 24,616 23,898
Total 27,410 26,406
Loans - Ending balance:    
Individually evaluated for impairment 12,313 12,665
Collectively evaluated for impairment 1,969,371 1,906,055
Total 1,981,684 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
Collectively evaluated for impairment 4,546 3,890
Total 4,546 3,890
Loans - Ending balance:    
Individually evaluated for impairment 416 422
Collectively evaluated for impairment 810,828 768,853
Total 811,244 769,275
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 99 71
Collectively evaluated for impairment 3,403 3,237
Total 3,502 3,308
Loans - Ending balance:    
Individually evaluated for impairment 2,198 1,975
Collectively evaluated for impairment 566,575 552,614
Total 568,773 554,589
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
Collectively evaluated for impairment 1,728 1,487
Total 1,728 1,487
Loans - Ending balance:    
Individually evaluated for impairment 0 136
Collectively evaluated for impairment 306,824 302,955
Total 306,824 303,091
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 0 0
Collectively evaluated for impairment 2,315 2,237
Total 2,315 2,237
Loans - Ending balance:    
Individually evaluated for impairment 1,777 1,602
Collectively evaluated for impairment 326,415 339,710
Total 328,192 341,312
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
Collectively evaluated for impairment 762 838
Total 762 838
Loans - Ending balance:    
Individually evaluated for impairment 325 375
Collectively evaluated for impairment 127,197 135,534
Total 128,436 137,234
Loans and Leases Receivable, Gross $ 127,522 $ 135,909