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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 6 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans - Ending balance:            
Loans and Leases Receivable, Gross $ 3,894,770   $ 3,894,770     $ 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 2 1 4    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 676 $ 2,320 $ 676 $ 2,609    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 676 $ 2,320 676 $ 2,609    
Individually evaluated for impairment 1,799   1,799     3,064
Collectively evaluated for impairment 34,874   34,874     34,501
Total 36,673   36,673   $ 39,148 37,565
Impaired Financing Receivable, Related Allowance 1,755   1,755     3,064
Loans - Ending balance:            
Individually evaluated for impairment 14,839   14,839     16,772
Collectively evaluated for impairment 3,795,631   3,795,631     3,101,620
Total 3,811,345   3,811,345     3,119,154
Loans and Leases Receivable, Gross $ 3,810,470   $ 3,810,470     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 1 1 2    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 676 $ 2,300 $ 676 $ 2,341    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 676 $ 2,300 676 $ 2,341    
Individually evaluated for impairment 1,616   1,616     2,909
Collectively evaluated for impairment 24,139   24,139     24,087
Total 25,755   25,755   28,778 26,996
Impaired Financing Receivable, Related Allowance 1,572   1,572     2,909
Loans - Ending balance:            
Individually evaluated for impairment 10,209   10,209     12,523
Collectively evaluated for impairment 1,785,458   1,785,458     1,620,191
Total $ 1,795,667   $ 1,795,667     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 0 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 248    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 $ 0 0 $ 248    
Individually evaluated for impairment           0
Collectively evaluated for impairment 3,387   3,387     3,420
Total 3,387   3,387   3,324 3,420
Impaired Financing Receivable, Related Allowance 0   0     0
Loans - Ending balance:            
Individually evaluated for impairment 287   287     430
Collectively evaluated for impairment 711,415   711,415     544,378
Total $ 711,702   $ 711,702     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 0 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 $ 0 0 $ 0    
Individually evaluated for impairment           0
Collectively evaluated for impairment 3,040   3,040     2,890
Total 3,040   3,040   2,730 2,890
Impaired Financing Receivable, Related Allowance 0   0     0
Loans - Ending balance:            
Individually evaluated for impairment 1,552   1,552     1,854
Collectively evaluated for impairment 521,633   521,633     348,294
Total $ 523,185   $ 523,185     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 0 1    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 20 $ 0 $ 20    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 $ 20 0 $ 20    
Individually evaluated for impairment           155
Collectively evaluated for impairment 1,164   1,164     1,149
Total 1,295   1,295   1,302 1,304
Impaired Financing Receivable, Related Allowance 131   131     155
Loans - Ending balance:            
Individually evaluated for impairment 1,489   1,489     1,903
Collectively evaluated for impairment 281,737   281,737     192,639
Total 283,226   283,226     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           0
Collectively evaluated for impairment 2,232   2,232     2,023
Total 2,284   2,284   2,036 2,023
Impaired Financing Receivable, Related Allowance 52   52     0
Loans - Ending balance:            
Individually evaluated for impairment 1,293   1,293     62
Collectively evaluated for impairment 344,602   344,602     240,698
Total $ 345,895   $ 345,895     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 0 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0    
Financing Receivable, Modifications, Pre-Modification Recorded Investment 0 $ 0 0 $ 0    
Individually evaluated for impairment           0
Collectively evaluated for impairment 912   912     932
Total 912   912   $ 978 932
Impaired Financing Receivable, Related Allowance 0   0     0
Loans - Ending balance:            
Individually evaluated for impairment 9   9     0
Collectively evaluated for impairment 150,786   150,786     155,420
Total 151,670   151,670     156,182
Loans and Leases Receivable, Gross $ 150,795   $ 150,795     $ 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 0 0    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0 $ 0 $ 0 $ 0