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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans - Ending balance:          
Loans and Leases Receivable, Gross $ 4,030,658       $ 3,158,161
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 4      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 676 $ 2,609      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 676 2,609      
Individually evaluated for impairment 2,417       3,064
Collectively evaluated for impairment 35,875       34,501
Total 38,292 $ 38,292 $ 36,673 $ 39,148 37,565
Loans - Ending balance:          
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (1,180)       (762)
Individually evaluated for impairment 10,693       16,772
Collectively evaluated for impairment 3,937,983       3,101,620
Total 3,949,856       3,119,154
Loans and Leases Receivable, Gross $ 3,948,676       3,118,392
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 2      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 676 $ 2,341      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 676 2,341      
Individually evaluated for impairment 2,063       2,909
Collectively evaluated for impairment 24,410       24,087
Total 26,473 $ 26,473 25,755 28,778 26,996
Loans - Ending balance:          
Individually evaluated for impairment 7,646       12,523
Collectively evaluated for impairment 1,853,639       1,620,191
Total $ 1,861,285       1,632,714
Portfolio loans, net | Commercial Real Estate Investor Owned          
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 0 1      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 248      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 248      
Individually evaluated for impairment 120       0
Collectively evaluated for impairment 3,655       3,420
Total 3,775 $ 3,775 3,387 3,324 3,420
Loans - Ending balance:          
Individually evaluated for impairment 544       430
Collectively evaluated for impairment 737,442       544,378
Total $ 737,986       544,808
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 0 0      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 0      
Individually evaluated for impairment 0       0
Collectively evaluated for impairment 3,246       2,890
Total 3,246 $ 3,246 3,040 2,730 2,890
Loans - Ending balance:          
Individually evaluated for impairment 1,513       1,854
Collectively evaluated for impairment 551,999       348,294
Total $ 553,512       350,148
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]          
Financing Receivable, Modifications, Number of Contracts | loan 0 1      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 20      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 20      
Individually evaluated for impairment 186       155
Collectively evaluated for impairment 1,439       1,149
Total 1,625 1,625 1,295 1,302 1,304
Loans - Ending balance:          
Individually evaluated for impairment 323       1,903
Collectively evaluated for impairment 301,859       192,639
Total 302,182       194,542
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 48       0
Collectively evaluated for impairment 2,204       2,023
Total 2,252 $ 2,252 2,284 2,036 2,023
Loans - Ending balance:          
Individually evaluated for impairment 667       62
Collectively evaluated for impairment 338,710       240,698
Total $ 339,377       240,760
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]          
Financing Receivable, Modifications, Number of Contracts | loan 0 0      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0      
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 0      
Individually evaluated for impairment 0       0
Collectively evaluated for impairment 921       932
Total 921 $ 921 $ 912 $ 978 932
Loans - Ending balance:          
Individually evaluated for impairment 0       0
Collectively evaluated for impairment 154,334       155,420
Total 155,514       156,182
Loans and Leases Receivable, Gross $ 154,334       $ 155,420
Portfolio loans, net | Residential Portfolio Segment [Member]          
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 0 0      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0      
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 0